Annual report 2005. Tackled challenges. - Stadt Zürich

Annual report 2005.
Tackled challenges.
ewz
Die Energie

Annual report 2005.
Tackled challenges.
People and places.
Buildings are used for various purposes – for living, working
and for all kinds of sporting, cultural and social activities.
The many different types of buildings demand individual solutions
for energy supply. In November 2002 the local council of
the city of Zurich awarded ewz the contract for providing energy
services. Since then, our Energy Services profit centre builds
and operates ecologically efficient energy supply facilities. In
past years, ewz has realised a great number of such facilities.
The annual report 2005 shows people in places that ewz supplies
with heating, cooling and fresh air.
The reference objects photographed.
Cover
Hallenstadion, Zurich
Page 6
Lake Side Casino Zürichhorn, Zurich
Page 9
Milandia, Migros Sport- und Erlebnispark
Grossried, Greifensee
Pages 10 to 15 «GC/Campus», Niederhasli
Page 16 Baugenossenschaft Eidg. Personal, Wohnkolonie
1-4, Zurich
Page 18 Alterswohnheim Riedhof, Zurich
Page 20 Goldbach-Center, Küsnacht
Pages 22 and 34 Hallenstadion, Zurich
Page 24 Schweikhofstrasse housing estate, Ebertswil
Pages 26 and 28 Masoala Halle, Zoo Zürich
Page 40 Haus Konstruktiv, Zurich
ewz
Die Energie

Contents
Overview
Foreword by the director.
Successfully tackled challenges.
Overview
Market
Products and
services
Electricity production
and distribution
Employees
Environmental
management
Finance
Facts and figures
in detail
Foreword by the director 3
2005 – an overview 4
Surroundings 6
Electricity products 8
The Grisons 10
Swisspower 11
Public relations 12
Energy services 13
Telecommunications 14
Grid services 15
Energy consulting 16
Green power 17
Public lighting 18
Production and power stations 19
Transmission grid 21
Distribution grids 22
Energy trading 25
Personnel 26
Health and safety 27
Environmental topics 29
Environment programme 30
Environmental figures 31
Electricity Savings Fund 33
Overview 35
Income statement 36
Balance (assets and liabilities) 37
Balance (details) 38
Cashflow account 39
Energy procurement 41
Energy output 42
Energy usage 43
Independent power producers in the city of Zurich 44
Green power 44
Public lighting 45
Low voltage connections 46
Energy metering and clocks 46
Energy contracting facilities 46
Customer structure 47
Employees 47
Transmission and distribution facilities 48
Distribution grid Zurich 49
Operation and maintenance 50
Company structure 51
Across Europe, the year 2005 was
marked by high and very volatile energy
and electricity prices. Additionally aggravating
was the effect of the extraordinary
drought in Switzerland. Thanks to our
own power stations and participations in
production plants, ewz can continue to
offer customers in Zurich and parts of the
Grisons stable and favourable electricity
prices.
On 21 st December 2005, the local council
debated the introduction of the new
ewz electricity tariff that was agreed upon
on 25 th January 2006. With the design of
the new tariff system, economic and ecological
requirements were taken equally
into consideration: On the one hand,
across all customer segments these tariffs
would count amongst the most favourable
in Switzerland; nevertheless, in the future
ewz would still be able to achieve the
profit goal set by the city of Zurich. On the
other hand, with the supply of different
electricity products with differing ecological
qualities and the granting of a bonus
for efficient energy usage, the demands
on a sustained energy supply are taken
into account. Furthermore, based on ewz’s
good earnings situation, on 1 st March
2006 the local council agreed to grant all
customers in the city of Zurich an additional
bonus of 7% on the new tariff over
the next three years. The new tariff should
be implemented by 1 st October 2006.
The European regulations for operating
transmission grids also present great
challenges to Swiss companies and
ewz. On 25 th May 2005 the local council
agreed to ewz joining the independent
national transmission company Swissgrid
AG. Until the company is operationally
active, the introduction of a new electronic
trading system and the auctioning
of grid capacities on the Northern border
of Switzerland will be carried out by the
grid co-ordination company Etrans.
In 2005, the Bergell power stations celebrated
their 50 th anniversary. The festivities
started in June with the opening
for a small photographic exhibition in the
Talmuseum. At the beginning of Septem-
ber, the entire population of the valley
was invited to the public festival and again
experienced the strong ties between the
city of Zurich and Bergell.
ewz can look back on a successful
business year. With total earnings of CHF
630.1 million, CHF 59.2 million can be
surrendered to the city treasury and
an additional CHF 110.7 million deposited
in contingencies and reserves of which
CHF 25.0 million is for the temporary
bonus campaign.
The business fields telecommunications,
grid services and energy services continue
to remain a central concern. The latter
is visually transformed with the pictorial
story from some of the selected reference
objects.
On behalf of the management I would like
to thank our customers for their confidence.
A special thanks also goes to the
885 employees for their great efforts
and commitment.
Dr. Conrad Ammann
Director
3

Overview
Overview
2005 – an overview.
The most important figures.
2005 2004 Change
CHF m CHF m in%
Profit and loss.
Overall performance 630.1 634.3 – 0.7
Operating expenditure 463.2 418.3 10.7
Operating result before
interest and taxation 166.9 216.0 – 22.7
Financial revenue 18.0 16.1 11.8
Tax – 15.0 – 8.9 68.5
Assignment of reserves – 110.7 – 164.4 – 32.7
Annual profit 59.2 58.8 0.7
Balance.
Fixed assets 686.2 651.2 5.4
Floating assets 437.5 410.4 6.6
Total assets 1123.7 1061.6 5.8
Equity capital 867.2 804.9 7.7
Loan capital 256.5 256.7 – 0.1
Total liabilities 1123.7 1061.6 5.8
2005 2004
Employees.
Zurich 754 728
Grisons 90 91
Apprentices Zurich 37 34
Apprentices Grisons 4 4
Total 885 857
1. 10.04 to 30.9.05 1. 10.03 to 30.9.04 Change
GWh GWh in%
Energy output.
Output Zurich 2898 2 856 1.5
Output Grisons 503 485 3.7
Storage pumps 153 134 14.2
Output to other plants 1 903 1 974 – 3.6
Total 5 457 5 449 0.1
Energy procurement.
Own plants hydroelectric 1 241 1 312 – 5.4
Partner hydroelectric 812 699 16.2
Partner nuclear power stations 2 047 2 238 – 8.5
Third-party energy 1 357 1 200 13.1
Total 5 457 5 449 0.1
Maximum load.
Peak power MW 592 586 1.0
Usable life h 5747 5 701 0.8
Number
Output
power kVA
Plants.
Substations Zurich 20 3 225 500
Substations/interconnection points Mittelbünden 71 607220
Substations/interconnection points Bergell 43 33 690
Transformer stations Zurich 698 1 172 500
Transformer stations Grisons 109 28 717
Medium voltage customer connections Zurich 137 695350
Own
Power stations
Substations
Lines
Partner
Power stations
Substations
Lines
Third-party
Substations
Lines
Cattenom
Bugey
Grimsel I
Mettlen
Kraftwerke II
Oberhasli
Altstafel
Obfelden
Innertkirchen
I II
Samstagern
Benken
Siebnen
I
Handeck
II
III
Blenio
Kraftwerke
Olivone
Peccia
Cavergno
Robiei Bavona
Maggia
Kraftwerke
Leibstadt Breite
Laufenburg
Seebach Auwiesen
Regensdorf
Fällanden
Gösgen
Wettingen
Zürich
Rempen
Kraftwerk
Wägital
Rothenbrunnen
Sils Sils Kraftwerke
Kraftwerke Mittelbünden
Hinterrhein Solis
Bärenburg
Tiefencastel
Tinizong
Ferrera Löbbia
Biasca
Bergeller
Castasegna Kraftwerke
Verbano
4
5

Overview
Overview
Surroundings.
Worldwide shortage of energy.
Across the world the question is asked
as to how the strongly growing requirement
for energy, especially in China
and India, can be covered over the long
term. With a continuously increasing
energy requirement, a shortage in electricity
production can be identified in
western Europe. The international energy
agency, European commissions, the
Federal Office for Energy, the association
of Swiss energy companies and numerous
other organisations are developing
energy perspectives. The first results have
already been partially published. They
show that for electricity supply an increase
in consumption still has to be reckoned
with and that a supply gap is in the offing
when older nuclear power stations are
taken out of operation in the time horizon
of the next 10 to 20 years. It would
appear to be rather unrealistic that this
gap can be compensated by means
of electricity production from renewable
energy sources (sun, wind, biomass), new
technologies (geothermics) or measures
for energy efficiency. The replacement
of old and the building of new conventional,
thermal power stations (coal, oil,
natural gas) or nuclear power stations are
therefore in the foreground of the discussion.
Increasing energy prices.
2005 showed that disruptions in the production,
transport and processing of
oil and natural gas immediately lead to a
price increase for these fuels. In 2005,
the introduction of trading with CO 2 certificates
in Germany led to an additional
increase in the price of electricity production,
above all from coal-fired power
stations. In Europe, the prices for electricity
at the wholesale level have increased
further and a change in trend is not foreseeable.
Furthermore, since 1 st January
2006 the limited line capacities on the
northern border of Switzerland were
allocated by auction. In December 2005
half of the transmission grid capacity was
put up for auction for the first time, since
the beginning of January the other half is
auctioned daily for the following day. The
auction in December was repeatedly
over-subscribed; in Switzerland, an additional
price increase for electricity imports
of around 20% can be calculated for the
light load periods.
Sustainability increases in
importance.
An increase in the frequency and strength
of hurricanes and typhoons has been
noticeable over the last ten years. These
and other weather extremes are attributed
to the worldwide global warming,
the main cause of which lies mainly in the
production of carbon dioxide through
the burning of fossil fuels. 157 countries
have signed the Kyoto Protocol. The aim
is to reduce the emissions of six greenhouse
gases by at least 5% compared
with the discharge in 1990. In order to
achieve this aim, measures for increasing
energy efficiency and for the increased
utilisation of renewable energies are being
promoted throughout Europe.
Increasing dependence on the
electricity supply.
In past years, because of the increasing
use of sensitive electronics in the control
of traffic systems, building technology
and communication, the significance of a
qualitatively perfect electricity supply
has continuously increased. Short interruptions
in the electricity supply already
lead to substantial disruptions in modern
everyday life. Large electricity cuts in
the last years have led to a further awareness
of the population. Throughout
Europe – as well as in Switzerland – the
pressure on the authorities is increasing
to strengthen the supervision of supply
companies and to ensure the quality
of operation, maintenance, renewal and
expansion of grids.
stations and participations in power
stations, ewz is in the privileged position
of continuing to have inexpensive electricity
from renewable water power or
CO 2 -free nuclear power despite massively
increasing prices at the wholesale
level. The customers in the supply areas
of the city of Zurich and parts of the
Grisons profit from favourable and stable
electricity prices. Great challenges for
ewz are the continuous adaptation of electricity
trading and the operation of the
transmission grid to the European statutory
framework in close co-ordination with
the other Swiss grid operators. The longterm
security of a qualitatively perfect
electricity supply by the acquisition and
expansion of know-how, systematic
maintenance and renewal of widely
branched plants and grids as well as the
building up of controllable quality standards
belongs to the core competence of
ewz. Commitment to the environment
and sustainability will continue to have
great importance.
Political surroundings –
Europe and Switzerland.
In Europe, the liberalisation of the electricity
market is well advanced. From mid
2007, all customers will be able to choose
freely from whom they wish to take their
electricity. The companies that transport
and distribute electricity have to pass
it through and are reimbursed for doing
so. In Switzerland, with the revision of
the electricity law (EleG), the legal prerequisites
should be created to enable
the associated Swiss companies to continue
to participate in electricity trading
in Europe. A new electricity supply law
(StromVG) should create the statutory
framework for an orderly liberalisation of
the electricity market and ensure a qualitatively
perfect electricity supply.
Challenges for ewz.
Together with the other electricity supply
companies in Switzerland, ewz is required
to adapt itself to the changed surroundings.
As a company with its own power
7

Market
Electricity products.
New tariff system for all customers.
For customers with consumption points
that consume a maximum of 60000
kilowatt-hours per year, i.e. private households
and small companies, there is a
choice between three electricity products.
If the customer himself is not active, he
is automatically supplied with the product
ewz.naturpower that fulfils the requirements
of the naturemade basic label: It
consists of a maximum of 95 % electricity
from hydroelectric power stations
that are certified according to naturemade
basic and at least 5 % green power
from wind, biomass and water certified
according to naturemade star. If an ecologically
superior product is desired,
then ewz.ökopower can be chosen: This
is somewhat more expensive. It is produced
entirely in power stations certified
according to naturemade star and contains
a maximum of 97.5% electricity from
hydroelectric power and at least 2.5%
solar power. For customers who place no
great importance on the origin or on the
ecological production of the electricity,
ewz.mixpower is available at a slightly
lower price. Independently of the chosen
electricity product, there is the additional
possibility of covering a freely selectable
portion of one’s own electricity requirement
with ewz.solartop (solar power).
Customers with consumption points that
consume more than 60000 kilowatt-hours
per year, i.e. medium sized and large
companies, can choose between the products
ewz.naturpower and ewz.mixpower
defined above. Furthermore, they can
cover a freely selectable portion of their
electricity requirement with ewz.wassertop
(green power from hydroelectric
power) and/or ewz.solartop – up to complete
supply. Of course both of these
additional products are certified according
to naturemade star.
It can be assumed that a considerable
portion of customers will choose
ewz.naturpower. Thanks to the portion of
new renewable energy integrated into
this product, this will lead to an expansion
of the electricity produced from wind
and biomass. In addition, the active sale
of ewz.wassertop and ewz.ökopower
will result in a further ecologisation of
hydroelectric power: The greater the
demand for these products, the more
hydroelectric power stations will be certified
according to naturemade star.
Because on average the new tariffs are
lower than the old ones, many consumers
will use the saved amount for the purchase
of ecologically superior electricity.
For the first time in Switzerland, those
companies (annual purchase of more than
60000 kilowatt-hours per consumption
point) that can prove in accordance with
officially acknowledged rules that they
utilise all their energy (not just the electricity)
efficiently are rewarded additionally:
They get a 10% bonus on their electricity
bill. Furthermore, in order to support all
customer groups in the search for energy
saving potential, ewz has continually
expanded the personnel resources for
energy consulting. Meaningful projects
and campaigns will continue to be
supported by contributions from the
Electricity Savings Fund. Operators of
heat pump systems will continue to
benefit from a special promotional tariff
that is based on ewz.naturpower. Alternatively,
ewz.wassertop can also be supplied
for heat pumps.
The customer information for this innovative
tariff system is an ambitious
undertaking: A balance has to be found
between transparency and the ability
to communicate. Communication from
ewz on the new electricity products is
built up on the basis of the awareness
campaign already started in the autumn
of 2005 that was launched in view of
the electricity labelling valid from 2006 as
per Federal law. In a first stage, a colour
was allocated to every type of electricity
production by ewz. In a second stage, information
was given about today’s composition
of the electricity mix from ewz.
The individual customer segments were
then specifically oriented about the available
electricity products and their composition.
In the future therefore, with the
introduction of the new tariff system,
the ewz customers themselves can determine
how the company is to produce
or procure electricity for them.
8

Market
The Grisons.
IBC – the largest ewz customer in the Grisons.
Market
Swisspower.
Headlines from the report year.
Apart from customer events in the areas
of green power and grid services, organisation
of the 50 th anniversary celebrations
in Bergell and supporting numerous
cultural and sporting events, the following
projects were in the foreground for the
Marketing department:
A new contract for the complete supply of
electricity for the Untervaz cement works
was finalised with Holcim (Schweiz) AG.
With this, ewz can strengthen the good
relationships with this industrial enterprise
that is so important for the Grisons.
ewz supplies the Untervaz cement works
with around 80 million kWh of electricity
per year – an upward trend thanks to
the continuous increase in production by
Holcim in Untervaz.
In 2003, in connection with the expansion
of the refuse incineration plant at Trimmis/Untervaz,
the operator, the Gemeindeverband
für Abfallentsorgung in Graubünden
(gevag), invited tenders for purchasing
the electricity produced and
for connection to the grid. Right from the
start it was a matter of importance for
ewz to offer the strategically important
producer and customer an optimum solution
with regard to grid design that at the
same time would increase supply security
for the communities of Trimmis and
Untervaz. In April, the new grid connection
was implemented and energy
deliveries were started with the desired
synergy effect for the communities.
On 1 st October 2005, a new set of agreements
with IBC came into effect for
supplying the city of Chur and the community
of Churwalden. With an annual
delivery of around 120 million kWh and a
further 42 million kWh of transit thirdparty
energy, ewz can expand the energy
supply enormously. IBC will therefore
become ewz’s largest customer in the
Grisons.
In the area of green power, the new
marketing concept was expanded with the
acquisition of the resale communities
Untervaz and Bergün. These communal
energy suppliers have decided to offer
their customers Premium green power
from ewz. Furthermore, in the community
of Savognin, ewz supported the realisation
of the La Niva potable water power
station with the purchase and marketing
of renewable energy produced in accordance
with naturemade star.
In the Grisons, CHF 454104 was paid
out from the ewz Electricity Savings Fund.
With this money, 50 heat pump heating
systems as well as 18 solar panels and
four photo-voltaic plants were promoted.
Swisspower, the mutual energy services
company of 20 Swiss municipal and communal
plants, concluded the year 2005
successfully and profitably.
Swisspower is actively preparing itself for
the market opening and supports the
electricity supply law (StromVG) worked
out by the Federal Council that foresees
an orderly market opening in two phases.
In 2005, the interests of the Swiss end
distributors were actively and successfully
represented in the political decisionmaking
bodies – for example the responsible
commissions of the National Council
and the Council of States.
Parallel to the political process, the branch
organisations have started to define the
rules for entry to the open electricity market.
Swisspower is closely observing
these developments in order to start building
up the necessary systems and processes
in good time. The process model
for processing customer cases in the
open electricity market was imparted to
all partners at internal seminars.
Together with the first rules required by
the open electricity market, Swisspower
was successful in renewing contracts
with bundle customers that expired in
2005 on favourable terms. In doing so,
customers showed great interest in additional
services offered by Swisspower –
in particular with regard to energy management
and complex clearing services.
In the area of product development,
«Gridfit», a multistage product for supply
security for companies, was developed
in close co-operation with the Swisspower
partners. Together with the existing product
portfolio, «Gridfit» has already established
itself on the market. It is pleasing
that energy supply companies in Germany
and Austria are also interested in Swisspower
products; the corresponding
negotiations are already partially well advanced.
The Premium green power products
by Swisspower – certified according to
naturemade star – are being met with
great interest by business customers. In
2005, contracts were finalised with two
new large customers for the delivery of a
significant amount of this high quality
green power.
10
11

Market
Public relations.
For the efficient use of energy.
Products and services
Energy services.
The most modern building technology systems.
Culture for insiders and outsiders.
volts&visions, the festival of visual experiences,
already belongs to the long-standing
events in the ewz-Unterwerk Selnau.
In the report year, ewz opened the doors
for seven large public events in its own
culture house. Amongst others, these included
the exhibition «1000 Peace
Women Across the Globe» – 1000 cards
with names, faces and biographies of
women who commit themselves to peace
projects. ewz also supports cultural
events at other locations such as the
popular series of summer concerts «Live
at Sunset» in the idyllic courtyard of the
Landesmuseum.
Sport for professionals and for the
people.
In 2005, the triathlete Christoph Mauch
from the ewz power team won the Ironman
Switzerland for the first time. In Zurich,
ewz supports numerous other popular
sporting events – for example the Zurich
Marathon. In doing so, ewz always tries
to motivate the organisers to cover the
whole or at least part of the electricity consumption
with green power.
Although in 2005 the ZSC Lions didn’t
achieve the champions title, high performance
was nevertheless demanded
of the players. Since the year 2000, ewz
successfully commits itself as a partner
of the ice hockey club.
ewz power station Höngg:
Audio-visual energy world.
The ewz power station Höngg has
been producing electricity for more than
100 years. Within the framework of a
comprehensive renovation, the exhibition
area was reworked and expanded with
a modern audio-visual energy show. The
ewz power station Höngg offers a free,
wide-ranging sight-seeing programme for
interested visitors. On 21 st May 2005
on the occasion of the official reopening
by the town councillor Andres Türler, a
big festival took place in the idyllic grounds
of the power station on the Werdinsel.
ewz customer centre:
Opening ceremony.
On 29 th October 2005 an open day took
place in the renovated ewz customer
centre at Beatenplatz. After a conversion
time of eight months, the customer centre
presented itself in new splendour and
in a pleasant atmosphere. Here, people
looking for advice get information on
electricity bills, the energy efficiency of
electrical equipment, green power – in
short: on all questions to do with energy.
The business of the energy services profit
centre was marked on the one hand
by the implementation and commissioning
of major systems such as the Hallenstadion
or «GC/Campus» and, on the other
hand by the acquisition of new projects.
Amongst other things ewz obtained the
contract for the Postzentrum Mülligen
in Schlieren, the residential estate «Freie
Sicht» of the Pensionskasse Energie in
Wädenswil or the Hotel Greulich in
Zurich. The profit centre has clearly positioned
itself in the market with innovative,
economic and ecological energy supply
solutions.
Hallenstadion Zurich.
In the summer of 2005, the converted
Hallenstadion was successfully put into
operation. As contractor, ewz financed
the energy supply systems and operates
the entire technology for heating, ventilation,
air-conditioning, electricity supply
and the ice rink. ewz supplies the cus-
tomer, the AG Hallenstadion, with the
desired room conditions and ice temperatures
for the respective event. Maintenance
and servicing are just as much a
matter of the contractor as the operation
of the systems.
«GC/Campus».
In order to optimise training possibilities,
the Grasshopper-Club Zurich (GC) built
the «GC/Campus» training centre in
Niederhasli. GC opened up new paths not
only with the realisation of the campus
but also with the building technology systems:
Instead of buying and operating
them themselves, the «GC/Campus» AG
as the building owner signed a contract
with ewz. ewz planned the systems
together with a firm of consulting engineers,
awarded contracts to companies
for the realisation and now ensures that
the desired amounts of hot water, fresh
air, heating and cooling are available
around the clock.
The system realised is a combination
of proven and new components: The core
is a heat pump with synthetic refrigerant.
Depending on the weather, it takes
energy from the warm outside air or from
the ground via 23 earth probes (150 m
deep). Hot water is provided by a new type
of CO 2 heat pump – currently the largest
system in Switzerland. The most important
innovation with this system is the environmentally
compatible and natural
refrigerant CO 2 . In contrast to synthetic
refrigerants, the carbon dioxide acquired
from the ambient air has no influence
on the greenhouse effect. If a leak should
occur in the heat pump, there is no danger
to man or the environment as the CO 2
simply evaporates back into the ambient
air.
12
13

Products and services
Products and services
Telecommunications.
Success with bandwidth services.
Grid services.
Light moments against blackouts.
The continuous availability of efficient
data connections and future-oriented telecommunication
services are of great
importance to large companies with business-critical
applications. ewz makes
its own historically growing telecommunications
infrastructure – such as empty
pipes, secure rooms for installations, glass
fibre connections and data transport services
– available to business customers
and third-party companies from the telecommunications
branch.
In 2005, the product portfolio for wideband
connections was further expanded
and successfully marketed. This was
done within the framework of the pilot
project approved by the Zurich town
council for the provision of bandwidth
services in the city and surroundings of
Zurich.
For companies offering financial services,
ewz created further network connections
between computer centres, Storage
Area Networks (SAN) as connections for
disaster recovery applications and LAN
connections. Apart from this, in co-operation
with the Swisspower partner works,
we realised intercity connections to
Basel, Bern and Geneva. For third-party
companies in the telecommunications
branch and ISP, numerous further connections
were created to end customers and
backbone links.
In order to optimally position the products
on the market, ewz and the partner works
presented the telecommunications services
at the Orbit trade fair and informed
the specialised audience of future products.
The aim of the exhibition, to establish
and strengthen contacts with the target
group of the IT and internet specialists,
was achieved.
The local know-how and the innovative
services from ewz create added value for
the residential and economic area of
Zurich. With the planned grid expansions
as well as the extension of the product
portfolio with further services for small
business customers – in a later phase also
for household customers – the significance
of the telecommunications division
of ewz will continue to increase.
With the larger power cuts in January in
western Switzerland, in June with the
SBB and after the floods in August, the
subject of supply security was a main
topic for our customers.
The grid services department offers
attractive and efficient products for increasing
individual supply security. These
products comprise availability calculations,
safety analyses and complete supply
concepts. Grid services can implement
such concepts with definitive
measures such as redundant grid connections.
For operation for example, ewz
offers a standby service, regular thermography,
mobile emergency generating
plants or the grid quality system for remote
monitoring of the customer system.
With other Swisspower partners, ewz
has developed the product «Gridfit» –
also with the aim of increasing the supply
security for companies in the Swisspower
distribution area.
The main topic at this year’s conference
for electrical planners at the depot was
supply security. The requirements of the
building insurance companies for a secure
electricity supply were also presented.
Electrical planners and ewz have the
same customer groups that desire a
close networking of building installations
and distribution grid to increase availability.
A particular light moment was the taking
over of the new Christmas illumination on
the Bahnhofstrasse in Zurich: A fascinating
contracting installation despite
teething troubles and mixed reactions
from the public.
14
15

Products and services
Energy consulting.
Continued search for energy saving potential.
Products and services
Green power.
Stronger trend towards renewable energies.
To support all customer groups in the
search for energy saving potential, ewz
has expanded the personnel resources
for energy consulting. The activities in
the report year are illustrated based on
three examples.
Together with other municipal energy
suppliers, ewz carried out a supplementary
training event for the gastronomy
concern SV (Schweiz) AG at seven locations
in the German-speaking part of
Switzerland. In small groups, 2700 employees
of the SV (Schweiz) AG were
given general information on the provision
of energy. The aim of the event was to
improve energy efficiency in gastronomy.
Over a total of three days, the ewz customer
centre offered a specialist event on
the topic of «energy efficient washing
and drying». To begin with, the event was
publicised with a demonstration at the
Migros-Markt in Altstetten that brought
many interested persons to the ewz exhibition
«ewzoom» at Beatenplatz. Experts
from different manufacturers of washing
powder were able to give their talks to a
large public. We were also visited by
school classes that covered the topic of
energy efficient washing as part of their
lessons as well as by a delegation from the
Zurich section of the Konsumentenforum.
Within the framework of consulting for
large customers, a feasibility study for a
solar heating system was successfully
produced. With the installation of 600 m 2
of solar panels, one customer with a large
requirement for hot water was able to
generate almost 350 MWh of heat and
therefore making a saving of 35000 litres
of oil per year. Based on the very favourable
building conditions, the installation
can be amortised within a period of only
eight years.
The insecurity on the energy markets
and the continual CO 2 discussion have
clearly stimulated the demand for «green»
power: In 2005, the ewz output of solar
power and ecological water power
was doubled in comparison with the previous
year. ewz belongs to the pioneers
in offering ecological power. Since 2001,
thanks to the quality label naturemade
star, our customers can buy green power
from us with a certificate of origin.
The stronger trend towards renewable
energies is also confirmed in international
surroundings – and it is causing problems
that until recently were unthinkable: Because
of the boom in solar installations in
Germany, the worldwide demand for
solar cells could no longer be met. The
manufacturers are now investing millions
in order to expand their production capacities.
Today, the EU only covers six percent of
the primary energy requirement from
renewable sources. In Switzerland, thanks
to water power, this portion amounts to
around one sixth. However, for sun, wind
etc., there is still a lot of potential in this
country.
offer is only insignificantly more expensive
than the tariff for ewz standard electricity
from water power and nuclear
power.
The increasing demand for naturemade
star electricity could not be entirely covered
by the production from our own
plants. However, thanks to free capacities
of our partners, the demand could be
satisfied without delivery shortages.
ewz Solar Exchange.
For many customers, solar power is still
the desired form of energy. In the spring
of 2005, the sixth invitation to tender
was launched for the ewz Solar Exchange.
From more than 60 tenders, contracts
were awarded for 18 new installations with
a total capacity of more than 750 kW.
In the report year, ten new installations
started grid operation. For the first time,
they included one installation each in
canton Appenzell Ausserrhoden and canton
Aargau. The total output power of the
now 88 installations increased to 3.2 MW.
With this, ewz has further strengthened its
leading position as the largest supplier of
solar power in Switzerland.
Premium power.
The trend towards an environmentally
compatible energy supply continues
with private and business customers. In
2005, the entire output of green power
certified according to naturemade star increased
to 17.7 GWh and therefore
almost doubled.
In particular, the product Premium Water
was very popular with our business
customers. This comes as no surprise as
with it customer environmental aims
can also be implemented in the area of
electricity supply.
The output of Premium Solar from the
ewz Solar Exchange was increased from
2.76 to 2.93 GWh. Instead of a defined
amount of solar power, private customers
are increasingly choosing our offer for
complete supply of green power with
97.5% Premium Water and 2.5 % Premium
Solar. Thanks to the continuing bonus
campaign of 30% on green power, this
17

Products and services
Public lighting.
Plan Lumière and more.
Electricity production and distribution
Production and power stations.
Drought caused a record low in reservoirs.
In the business year 2005, a total of
around 8 km of district roads were equipped
with high pressure sodium lamps.
Energy consumption for public lighting increased
by 0.63% – with an in-crease of
799 lighting points.
Plan Lumière.
The aim of Plan Lumière is to give Zurich
a more attractive nightly appearance.
On 10 th February 2005 the first pilot projects
were put into operation – on the
Rudolf-Brun-Brücke and Münsterbrücke,
on the Hardturmviadukt and in Zurich-
Affoltern.
Wahlenpark.
The Wahlenpark is one of four new parks
in the centre of Zurich Nord and covers
an area of around 12000 m 2 . Attention is
drawn to the small forest with copper
beeches bordering on the Birch school
by means of a discreet illumination. A
floodlight mast, a round, illuminated pond
with an asymmetrical roof and a 160 m
long bench with integrated lighting blend
into the park as further elements.
The new Christmas illumination consume
more than 80% less electricity than
the old ones. From the engineering
point of view the new technology is fascinating:
In each of the 275 fluorescent
rods, the circular bundles from 28 lightemitting
diodes are individually steered
at 32 levels. Light architects and programmers
have developed a software with
which the 8800 luminous spots are
switched on and off so that a Christmas
illumination full of atmosphere is created
in the Bahnhofstrasse adapted to the
time of day.
In the hydrological year (1.10.2004 to
30.9.2005), the total amount produced by
ewz’s own power stations and partner
plants amounted to 4100 GWh, 149 GWh
or 3.5% less than in the previous year.
Production in hydroelectric plants.
With 2053 GWh, the hydroelectric plants
produced 2% more than in the previous
year. However, the inlets only amounted
to 1849 GWh or 80% of a normal year.
That is the lowest value for the last 25
years. The considerable inlet deficit and
the negligibly higher production had to
be compensated by the water storage
content. The sought-after storage target
could not be achieved and the new
hydrological year began with a record low
storage content of merely 60%.
Production in thermal plants.
With 2047 GWh, production in the thermal
plants was 191 GWh or 9% below the
result of the previous year. Roughly half of
this lower production was caused by a
generator breakdown in the Leibstadt nuclear
power station that led to a five-month
standstill. The other half was essentially
accountable to the Gösgen nuclear power
station. In this year, the annual inspection
was extended to 47 days in order to exchange
the primary safety valve. Because
of the longer inspection, production
from the Gösgen nuclear power station
sank by 77 GWh to 1129 GWh. The purchases
by AKEB (Aktiengesellschaft
für Kernenergiebeteiligungen) sank by
113 GWh to 919 GWh compared with
the previous year.
Lindenhofmauer.
In connection with the renovation work,
illumination of the Lindenhofmauer
was planned and realised by ewz. The
lighting system will fully comply with
the requirements for little glare on the terrace
and minimum light emissions.
Ampèresteg.
A classic trough bridge made of steel
was erected as the important connection
between the districts of Wipkingen and
Zurich West. The safety lighting was integrated
into the edge of the bridge. This
generates an interesting lighting effect that
perfectly draws attention to the bridge.
Bahnhofstrasse Zurich.
The Vereinigung der Zürcher Bahnhofstrasse
signed a sub-contracting contract
with ewz for the new Christmas illumination:
Around one third of the investment
costs and the annually recurring expenditure
for mounting, operation and maintenance
of the illumination are prefinanced
by ewz or invoiced annually to the Vereinigung.
Part of the work is carried out
by employees of the lighting department.
18

Electricity production and distribution
Electricity production and distribution
Transmission grid.
Swissgrid still not operative.
Bergell power stations.
The report year was marked by the 50 th
anniversary celebrations of the Bergell
power stations.
The project for replacing the control equipment
that gave rise to intensive activity
during the last six years was concluded
on time at the end of the year. Monitoring
and operation of the Bergell power stations
are now done with the latest technology.
As a result, availability of the
machines was considerably improved.
To ensure supply to the valley, in particular
in the area of Maloja, a 6 km long
underwater cable was laid through the
Silser See between Maloja and Sils i. D.
The cable replaces the old, inadequate
emergency connection between the
Bergell valley grid and the grid in the upper
Engadine.
Mittelbünden power stations.
In the Sils power station, renewal of the
mechanical parts was concluded with the
general overhaul on machine group 2.
The exterior of the power station building
was given a comprehensive facelift. In
the Solis power station, a directive had to
be given to limit output because of the
formation of cracks in the machine shaft.
A new shaft was ordered. The crane system
was examined with a view to replacing
the shaft at the beginning of next year.
The town council approved payments
of CHF 12.4 million for repairing the head
race tunnel and the pressure line as well
as for renewing the electrical and mechanical
installations in the Tiefencastel
West power station.
As a result of the storms in the Landwassertal
at the end of August, large
amounts of deposits were again washed
into the Solis reservoir. With it, the sedimentation
of the lake is further advanced
but is still without problem.
Power stations on the Limmat.
The first half of the renewal project at the
Wettingen power station was concluded
successfully. The ambitious schedule
from 2003 is still being maintained. In April,
automation of the first machine was
completed and it was connected to the
new 110 kV switchgear. In summer, the
second renewed weir panel was put into
operation. Although the entire year was
very dry, the fast rising floods at the end
of August 2005 also took the power
stations on the Limmat by surprise. The
level of the lake of Zurich enabled a
slight deviation from the normal lake regulation
in agreement with the supervisory
authority. With the enormous rise in the
Sihl as a result of relieving the Sihlsee,
the outlet from the lake of Zurich was limited
so that the water carried by the
Limmat below the city could not lead to
greater damage. The floodwater was
easily discharged by the three power stations
Letten, Höngg and Wettingen.
The Geroldswiler Aue that was completed
in 2004 also proved itself during
the floods. As desired, new gravel banks
have been formed and certain areas are
meandering. However, significant flood
damage was recorded at the Wettingen
spinning mill. At the intermediate weir
in the Limmat loop below the Wettingen
power station, the regulating weir was
undergoing inspection and a new fish
ladder was under construction. In this area
the Limmat burst its banks and flooded
part of the spinning mill buildings. The
embankment and the riverside front garden
were washed away. In order to avoid
the building that was now being directly
washed by the river from collapsing,
around 4000 tons of Black Forest granite
were poured in. The building was saved.
Once the Swiss long-distance supply
stations Atel, BKW, CKW, EGL, EOS and
NOK had founded the Swissgrid AG
(a company for operating the Swiss transmission
grid) at the end of 2004, the city
of Zurich was also able to participate in
the company with 12.85% of the initial
shares based on a decision by the local
council on 25 th May. However, by the end
of the year effective operation of Swissgrid
could not be started because an appeal
against the conditions decreed by
the Competition Commission is pending.
Under consideration of future advantages
and disadvantages, the operators of
the Swiss transmission grid have decided
in a first stage to systematically open
their grids for transit electricity at the
highest voltage level. In the report year,
the transmission grid operators also
received reimbursement from the foreign
system partners for the physical load on
the transmission grid by transit flows.
Maintenance.
After the various major disruptions in
worldwide electricity supplies, greater
importance is attached to adequate treefelling
in the area of high voltage lines.
With the purchase of a radio-controlled
crawler cable winch, the efficiency and
work safety for felling work were further
increased.
With the amicable agreement with a landowner
who is planning to build in the
region of Baar, a building and use restriction
was established for the long-term
route security of the Benken/Grynau–
Mettlen line. The expiring transmission
rights for the Castasegna–Löbbia–Bivio
line were newly acquired by private
contract.
Projects.
In mid April, construction of the foundations
began for relocation of the Cunter–
Tiefencastel section of the 220 kV Bergell–Sils
i.D. line. At the end of the year, the
foundations were constructed and a large
extent of the anchoring work was completed.
Tenders were invited and the contract
awarded for the manufacture of
900 tons of lattice towers.
For the expansion of the Bethlehem
gravel works at Menzingen in canton Zug,
1.2 km of the high voltage Benken/Grynau–Mettlen
line had to be relocated. The
demanding assembly work was concluded
in time and within budget.
The more than 50 year old steel guard
wire in the Glaubenberg–Hellbühl–Littau
section of the Innertkirchen–Mettlen line
was replaced because of old age. The
new 26 km long guard wire is equipped
with glass fibre.
20
21

Electricity production and distribution
Electricity production and distribution
Distribution grids.
Operational, expansion and renewal work
in Zurich and Mittelbünden.
Operation and grid centre.
The centralised operating control valid
as per 1 st October 2004 has proven to be
very successful and the works engineers
have taken over their new tasks in the
high and medium voltage grid. With it, the
overview of the distribution grid for the
city of Zurich was improved. Software
adaptations and a separate grid still had
to be produced for the newly installed
medium voltage operating control system
DMS.
On 30 th September 2005 ewz operated
a total of 912 medium voltage installations
of which 252 (27.6%) with 22 kV operating
voltage. The maximum load rose to
490 MW.
The grid reliability for ewz will now also
be raised according to the international
standard IEEE. The customer-related reliability
characteristics – the frequency
index SAIFI, that indicates the average
interruption frequency, as well as the
non-availability index SAIDI, that records
the average non-availability duration in
minutes per customer and year – are
therefore also applicable for benchmark
comparisons. ewz presented the values
prepared in a study at the CIRED 2005
in Turin (Congrès International des Réseaux
Électriques de Distribution) as well
as at the information day of the Schweizerische
Nationalkomitee CIGRE/CIRED.
The values are low in comparison with
other distribution grids – especially those
abroad.
With the fault recording system, emphasis
was placed on the production of
automatic grid quality reports in accordance
with EN50160 as well as on system
stability. In the case of faults, numerous
external customers now have the opportunity
of directly viewing their data via
telephone switched lines or via internet
connection.
Periodic maintenance work was carried
out according to schedule on 82 ewz
transformer stations, six rectifier stations,
nine high voltage purchaser installations
and 564 low voltage installations.
tive for non-ionising radiations and site
data sheets were produced.
Metrology.
A new remote metering system was set
up and the existing equipment for large,
medium and low voltage customers
were acquired with Gridcode and OBIS
reference numbers. In 93 different installations,
105 repair and service assignments
were carried out for equipment
maintenance for the remote metering
system.
At the calibration facility for electricity
meters, work can now be carried out with
the new precision calibration station.
The official examinations of the complex
combined watthour counters take place
automatically during the night whereby
large time savings can be achieved.
11977 meters were calibrated. At the calibration
facility for heat meters,181 heat
Inspections and load readings were
carried out with reports for 865 medium
voltage installations (TS/HB/Prov./VS),
42 rectifier stations for the VBZ and four
rectifier stations for the SZU. For 204
transformer stations, detailed clarification
was made for compliance with the direcmeters
and 195 pairs of temperature
probes were officially tested.
The «Europäische Funkrundsteuerung»
(EFR) field trials did not show the hopedfor
results. Because of the weak radio
signal level and the randomly distributed
noise level, the project was no longer
followed up.
Documentation and co-ordination.
After five years, at the end of June 2005,
the electronic data processing for the
initial recording of cable routing plans, high
voltage geo-schematics and grid plans
was successfully concluded.
The creation of a central connection
office for all grid connections was realised
with the integration of employees
from the Market and Customers division.
In 2005, a total of 421 normal, special
and building connections, disassemblies,
provisional buildings, relocations and reinforcements
were ordered and carried
out on time. A further 178 quotations
were processed for telecommunication
bandwidth requests.
Route project planning North/East/South:
In the completed business year, 570 applications
for building permits were dealt
with and 31 grid construction projects
passed over to line construction for execution.
Investments.
With the renewal project for the Samstagern
substation, after comprehensive
preparatory work on the own use facilities
and constructional adaptations, renewal
of the switchgear sections was started
and completed by the end of the year.
The main, under and direct voltage distribution
as well as the control systems
were also put into operation.
Plants and grids.
After 25 years of operation, a comprehensive
inspection was carried out
on the 220 kV power circuit breaker in
the Auwiesen substation.
After 25 years of operation, an inspection
was carried out on the 11/22 kV switchgear
in the Sihlfeld substation; at the same
time, measures for improvement were
taken as suggested by the supplier.
Because of the disruption in the Katz substation
on 21 st November 2004, it was
decided to replace all bus bar longitudinal
connections (DURESCA bars) in the
11/22 kV system.
22

Electricity production and distribution
Electricity production and distribution
Energy trading.
New timetable management system.
In the Frohalp substation, the building
work including work on the surroundings
was concluded. The second stage of the
new SF 6 -insulated 11/22 kV switchgear
was concluded on schedule. The medium
voltage transformer terminals for transformers
1 and 2 lie in a newly constructed
channel.
In the Sempersteig substation, the new
150 kV SF 6 switchgear was mounted.
It consists of two line and two transformer
sections, a coupling section as well as
two sets of bus bars.
In the Irchel, Katz and Drahtzug substations,
the components necessary for
the second ripple control frequency of
317 Hz were installed.
In the Uetlibergtunnel, construction of the
cable conduit system for the 220 kV
Wollishofen–Waldegg line (conduits in the
direction of Basel) was completed. In
the report year, the construction length in
the conduits in the direction of Chur
amounted to 2492 m. For mounting the
conduit couplers, it was necessary to install
a coupling recess every 450 m.
42 construction projects were carried
out for the medium and low voltage grid.
Amongst these were six grid renewals
and extensions for medium voltage and
four for low voltage. 18 projects were carried
out for transformer stations on behalf
of medium voltage customers. 43 customer
orders were related to the telecommunications
sector with the corresponding
channel constructions.
In the field of transformer stations and
medium voltage installations, eleven new
constructions and seven conversions
were carried out. Two stations were dismantled
and an NISV renovation was
carried out on seven. The Witikon rectifier
station that supplies traction current for
the VBZ was converted and renovated.
Mittelbünden distribution grid.
In the report year, the department Mittelbünden
distribution grid was put directly
under control of the production division.
With a view to the market opening, a new
specialist position was created for processing
grid efficiency questions.
In the Solis power station, an 11 kV
system with switchgear sections was installed.
On the one hand it replaces
the valley supply switchgear system and
on the other hand the machine switchgear
system (both from the 1950s). The
surrounding overhead medium voltage
grid was cabled for trouble-prone
forest sections. An emergency supply was
created for the housing developments
Zorten, Lain and Muldain in the community
of Obervaz.
For supply to the communities of Untervaz
and Trimmis as well as the refuse
incineration plant, the ewz part of the 60 kV
plant in the Untervaz substation was
replaced with gas insulated switchgear.
In addition, a further 60/10 kV power
transformer was installed and the corresponding
10 kV switchgear was extended
accordingly.
After a long search, a replacement location
was found in Feldis for the 70 year
old rod-actuated transformer station. The
new cabin station supplies the northern
part of the village. In Cazis, building activities
in the Caschneras district necessitated
the construction of a new transformer
station. Various building site supply
installations will be necessary for the
forthcoming inspection of the Tiefencastel
West power station. The planning work
for this is completed and the building
work has already started.
In the Sils and Rothenbrunnen substations
the transmission programs for the
ripple control system have been adapted.
With 5457 GWh, the total turnover from
energy production and energy purchases
remained practically constant (+0.1%)
in comparison with the previous year. Despite
the apparently unchanged situation,
2005 was a difficult year with many deviations
from normal conditions.
The hydrological year 2005 was distinctly
dry – with an extreme inlet deficit of 20%
compared to the average year. In addition,
the thermal production turned out to
be 9% less because of damage to a generator
in the Leibstadt nuclear power
station and because of the longer inspection
of the Gösgen nuclear power station.
The deficit on inlets and thermal power
was compensated by an increase in energy
purchases (+14%) and by an increase
in hydroelectric production (+2%) with
the utilisation of storage water. As a result
of this, the new hydrological year started
with a historically low storage level of
60%.
During the course of the year, the electricity
prices on the EEX energy exchange
continued to increase. The price for continuous
power rose by more than 30%.
The otherwise normally low energy prices
in the summer period failed to appear.
The observed price increase went along
with the trend in prices in the newly introduced
CO 2 certificate trading in the EU.
With energy imports in the low load hours
in winter, massive grid bottlenecks
occurred for the first time on the northern
border of Switzerland. Because of this,
during these hours the Swiss price level
decoupled itself from the exchange prices
in Germany and rose from time to time to
the level in Italy. At certain points, extreme
drought and unexpected power station
breakdowns gave rise to further price deviations.
On 14 th December 2005, Etrans introduced
a new timetable management system
that enables the electricity companies stepby-step
to a discrimination-free and unlimited
energy exchange with trading partners
at home and abroad. The changes
required demanding adaptations to informatics
and the processes in energy trading.
Thanks to extraordinary efforts, the
system change was accomplished on
schedule and without errors. Since the introduction
of the new timetable management
system, ewz is in the position of
independently processing cross-border
energy exchange to and from Germany.
24
25

Employees
Personnel.
Increasing activity for the care of personnel.
Employees
Health and safety.
General ban on smoking for the administration building in
Oerlikon.
Employee interviews.
According to the Cash employee interviews
2004, the ewz employees are satisfied
with their work situation and their
salary. ewz is estimated as a reliable and
attractive employer.
Management development.
After the senior management, in 2005 all
department heads visited the workshops
on the principles of leadership. Subsequent
to this general training, the management
development will be continued
and intensified over the next three years
in the form of selectable, practical modules.
Personnel care.
By means of the implemented management
development, in 2005 increasing
activity by the line superiors became visible
in the implementation of personnel
leadership topics. In order to optimise the
development potential of our employees,
the new position of a personnel developer
was created.
Social advice.
In Zurich and Chur, social advisory offices
are available to employees free of charge.
Here they can get advice on personal,
financial or social matters. A competent
contact was found with Movis AG, the
largest Swiss company offering internal
social advice.
Prevention of sexual harassment at
the workplace.
Of great importance were the definition
of preventive and sanction measures
for sexual and sexist harassment at the
workplace and the appointment of a
corresponding confidential person for
employees.
payed out as capital that is decisive for
calculation of the pension.
Apprentices.
In the city of Zurich, 5% less apprenticeships
were available than in the previous
year while the number of persons
leaving school increased by 5.5%. In
workshops and guided tours we have
given different upper school classes
an insight into our nine vocations requiring
an apprenticeship. All the apprenticeships
were taken up and increased
to 41.
Women.
The female employees make 11.8% of
all employees. One female was taken on
as an apprentice car mechanic.
The in-house health improvement was
included in the ewz safety concept – with
the aim of improving the health of employees
in order to maximise performance
and minimise absences.
Smoking forbidden.
For the protection of non-smokers, a
general ban on smoking was introduced
for the administration building in Oerlikon
(BGO). A smoking room is available for
smokers. A specialised lecture, information
stands and a contribution to costs
for successfully giving up smoking support
the introductory phase of the smoking
ban.
Further campaigns.
Four specialised lectures on general
areas of health, professional advice on the
feet and a campaign for inexpensive
bfu bicycle lamps were put on the programme
for health improvement. Financial
contributions were made for carrying
out tests on ski bindings and for the
acquisition of shoe spikes (protection
against sliding on snow and ice).
The weekly activation and relaxation
training and the monthly personal health
advice were extended to other locations.
185 employees benefited from the free
flu inoculation campaign (137 persons in
the previous year).
In efforts to optimise the range of further
training, the repeat courses in first aid
and fire protection can now be attended
on one single day.
The newly introduced telephone alarm
system for emergencies was successfully
tested in the administration building in
Oerlikon and in the Herdern depot.
Accidents and days of absence.
Occupational accidents increased from
26 to 34, days of absence from 189.5
to 203. Non-working accidents changed
from 98 to 97 (days of absence: from
832 to 1443) and cases of illness from
1303 to 1383 (days of absence: from
5312 to 5785). The average absence per
employee increased from 7.5 to 8.7 days.
These absences were analysed and
ncluded in the prevention 2006.
The priority topic of the annual audit
of the safety organisation was working
materials. The audits show that documentation
for the instructions and servicing
of working materials still has to be
implemented.
Pension fund.
As of 1 st January 2005, the pension fund
of the city of Zurich carried out adaptations.
For the old-age benefits, the age for
flexible retirement was defined between
58 (up to now 60) and 65 years. For dependents
benefits, partners of the same
or different sex are put on the same footing
as a widowed wife or husband. On
old-age retirement, insured persons can
have up to half of the old-age balance
26
27

Environmental management
Environmental management.
Man and nature – optimally protected.
Environmental topics.
Projects from everyday life.
Shielding of magnetic fields.
The official regulations on protection
against non-ionising radiations (NISV)
stipulate for Switzerland the lowest limit
values for magnetic fields worldwide.
One of the main difficulties was that one
could only estimate the effect of shielding
in advance or measure it afterwards.
Although with time a certain amount
of experience could be gathered with
shielding, it was nevertheless a relatively
expensive «gamble»: If too much was
shielded then the investments were too
high, if too little was shielded, improvement
costs were accrued.
Up to now, the calculation for room
shielding was considered as an insolvable
problem because all field calculation
programs had to capitulate in the face of
the thin shielding in comparison with
transformer stations. An unconventional
co-operation between ewz and the ETH
Institute for High Frequency Technology
(the grid frequency of 50 Hz is not a high
frequency) brought an astonishing breakthrough.
In an ETH thesis, two clever and
tenacious students showed that current
distribution problems could also be
solved with field calculation programs for
high frequency and a couple of tricks.
Today, with NIS renovations ewz can calculate
the shielding material and the
quantity much more accurately in advance
and can therefore save much time
and money.
is achieved via a two-stage air lock. The
working areas within the enclosure must
only be entered in protective clothing.
The old jointing compound with PCB has
to be removed as completely as possible
from the faces of the cement joints.
On cleaning, no heat must occur as this
could produce dioxin. For this reason,
cleaning is done with the dry ice method.
CO 2 ice granules are injected into the
joints as with sand blasting.Cleaning takes
place by the brittleness and mechanical
corrosion of the ice granules. With this
method, neither dust nor humidity are
created and the contaminated waste remains
minimal.
Joint renovation Rothenbrunnen.
In 1973, the administration building
Rothenbrunnen was erected as a skeleton
construction with prefabricated concrete
elements. As was normal at that time,
the building joints between the individual
elements were sealed with a filling compound
containing PCB. There is no acute
danger from the PCB charged jointing
compound as long as there is no direct
contact with the skin and uncontrolled
release is avoided when replacing. This
avoidance of uncontrolled release or
transmission of contaminated dust, fragments
of jointing material or packing
sections also causes the greatest expense
on joint renovation. The scaffolding
has to have an air- and dust-free enclosure.
Access to the enclosed scaffolding
29

Environmental management
Environmental programme.
Selected topics.
Environmental management
Environmental figures.
Selected topics.
ewz’s environmental programme recognises
eight environmental topics with
25 goals that are monitored with reference
figures. In the following, selected reference
figures are presented for these eight
topics. Priorities in the past as well as
in the current year are the areas of emissions
with the topic of electromagnetic
fields, polluted areas and mobility as well
as the area of nature and landscape with
the topics green power according to
naturemade and care of green areas. The
environmental programme comprises
a total of 78 individual goals the handling
of which required around 206 working
days and CHF 757000. At the end of the
year 77% of the set goals had been
achieved.
Thematic sub-programme 2005 2004
Electrical and magnetic fields, noise and vibrations.
(Assessment period: Calendar year)
Fields (NISV)
Expected renovations 404 409
Noise
Noise investigations 4 1
Noise measures 7 1
Nature and landscape.
(Assessment period: Hydrological year)
Production naturemade star 10372 MWh 10057 MWh
Höngg power station 7709 MWh 7738 MWh
ewz Solar Exchange 2663 MWh 2319 MWh
Production naturemade basic 1185249 MWh 1253576 MWh
Total naturemade 1195621 MWh 1263632 MWh
Trade naturemade star 7709 MWh 7650 MWh
Trade naturemade basic 73481 MWh 5361 MWh
Total trade naturemade (incl. supply area) 81190 MWh 13011 MWh
Energy efficiency.
(Assessment periods: Electricity: Hydrological year; combustibles and fuels: Calendar year)
Energy requirement electricity 16427 MWh 16092 MWh
Energy requirement heat 1930 MWh 2156 MWh
Public lighting 22308 MWh 22170 MWh
Energy services facilities
Energy sales 57428 MWh 40 750 MWh
Energy purchases 45633 MWh 29926 MWh
Energy use renewable 18733 MWh 16547 MWh
Own requirement fuels
Petrol and diesel 226190 l 281166 l
Natural gas 3939 kg 2798 kg
Total fuels 2556 MWh 2616 MWh
Service water 17377 m 3 12831 m 3
Material efficiency.
(Date of balance sheet: 31 st December 2005)
Grey energy contained in power stations and grids
Proportion power stations 2065774 MWh 2065774 MWh
Proportion grids 940490 MWh 938631 MWh
Total 3006264 MWh 3004406 MWh
Average yearly material flow (average depreciation over 50 years)
Proportion power stations 41315 MWh 41315 MWh
Proportion grids 18810 MWh 18719 MWh
Total 60125 MWh 60034 MWh
Selected topics:
Greenhouse gas emissions.
The greenhouse gas emissions from ewz
fall into three classes: Emissions according
to the CO 2 law, emissions outside the
CO 2 law and emissions in the contracting
business. The two mentioned first are
presented below. ewz will presumably
achieve the stipulations according to the
CO 2 law. For the partial goal «fuels alone»
however, additional efforts are necessary.
Environmental topics
Electrical and magnetic fields,
noise and vibrations
Nature and landscape
Energy efficiency
Material efficiency
Disposal
Dangerous materials
Polluted areas
Review 2005
In the municipal surroundings, the official
regulations for protection against nonionising
radiations (NISV) chiefly affect
transformer stations.
As in the previous year, in 2005 ewz again
renovated five installations and a further
five were partially renovated.
Three power stations were selected for
future certification according to naturemade
star.
A green area assessment was carried out
for the ewz grounds within the greater
Zurich area.
Clarification for Minergie certification of
the administration building in Zurich-
Oerlikon proved to be more complex than
expected.
The concept for the use of recycling
paper was updated in accordance with
the municipal regulations.
Adaptation of the processes to the new
legal situation in the area of refuse was
completed (VeVA and LVA).
Construction joints containing PCB were
removed from two buildings in the
Grisons.
The preliminary technical investigations
for the works areas are concluded.
Outlook 2006
For 2006, the implementation provisions
for the NISV for the field of electricity
supply are again only expected in part.
Nevertheless, ewz will continue to carry
out renovation of transformer stations
in accordance with its own renovation
plan.
For two of the three power stations, the
management concept will be produced
for naturemade star.
Based on this evaluation, guidelines will
be drawn up for the care of green areas.
The package of measures for Minergie
certification will be put together and
presented to the town council.
The concept for the use of recycling
paper should be approved and implemented.
The new processes in the area of refuse
will be monitored.
The procurement of environmentally
efficient vehicles is foreseen (four cars
and two lorries).
Together with the authorities, the conclusive
assessment of all investigation
results will be aimed for.
Greenhouse gas emissions
(CO 2 equivalents in t/a)
Target 2010
01
02 03 04 05
Fuels
Combustibles
Refrigerants
Sulphur hexafluoride
3500
3000
2500
2000
1500
1000
500
0
Environmental management
The mobility policy was drawn up and
included as an extension to the environmental
policy.
A mobility concept will be prepared for
implementation of the mobility policy.
30
31

Environmental management
Environmental management
Electricity Savings Fund.
Promoting the conscious handling of energy.
Thematic sub-programme 2005 2004
Disposal.
(Assessment period: Calendar year)
Refuse 65.4% 2739 t 67.9% 2 690 t
Valuable substances/recyclables 24.3% 1019 t 24.5% 971 t
Special refuse 10.3% 429 t 7.6% 301 t
Total 100.0% 4187 t 100.0% 3962 t
Dangerous materials.
(Assessment period: Calendar year; date of balance sheet: 31 st December 2005)
Inventory (book values)
HCFC 544 kg 544 kg
CFC 5758 kg 4415 kg
Other coolants 2750 kg 2000 kg
Insulating gas (SF 6 ) 16627 kg 14944 kg
Annual losses
HCFC 0.0 % 0 kg 6.4% 35 kg
CFC 1.4 % 80 kg 0.6% 26 kg
Other coolants 0.2 % 5 kg 0.5% 10 kg
Insulating gas (SF 6 ) 0.4 % 69 kg 0.6% 93 kg
Greenhouse gas emissions in CO 2 equivalents
Fuels 674 t CO 2 692 t CO 2
Own requirement heat 387 t CO 2 439 t CO 2
Coolant losses 104 t CO 2 93 t CO 2
Insulating gas losses (SF 6 ) 1521 t CO 2 2056 t CO 2
Total 2686 t CO 2 3280 t CO 2
Polluted areas.
(Date of balance sheet: 31 st December 2005)
Property inventory
Areas 443 439
Total area 2862887 m 2 2780281 m 2
Inspected areas 443 439
Suspected areas 12 13
Environmental management.
(Assessment period: Calendar year)
Reference figures
Goals set 78 96
Degree of achievement 77 % 78 %
Internal audits 8 4
Audit findings 39 22
Measures taken 35 18
Verified legal changes 76 31
Resulting adaptations 23 5
Communication events 34 73
Training days 28 49
Event reports 0 1
Employees with environmental function 39 39
Enquiries on environmental aspects 160 139
8
7
6
5
4
3
2
1
0
Development Electricity Savings Fund (CHF m)
95
96
97 98 99 00 01 02 03 04 05
Contribution by ewz
Approved grants
Payments
Last year, contributions from the city
of Zurich Electricity Savings Fund were
approved for 257 projects (2004: 266
projects; 2003: 200 projects). More than
one third of the development money
paid out was used for installations that
utilise ambient and waste heat (for example
heat pumps and solar panel installations).
Installations and measures for
reducing electrical consumption received
7%, while 29% was paid out for energy
production plants (for example photovoltaic).
Furthermore, 6 % was used for
research and development work and
17% for energy consulting at the municipal
service division UGZ.
Electricity Savings Fund campaigns.
With the campaign «energy efficient cooling
units of classes A+ and A++» customers
received a development contribution
for a total of 2256 units. This corresponds
to an increase of 50% in comparison with
the previous year (2004: 1477 units).
Thanks to the Ecoman adapters, standby
losses as well as danger of fire can be
greatly reduced. They are on offer at a
greatly reduced price in the ewz customer
centre.
After the scheduled conclusion of three
Electricity Savings Fund campaigns
(electricity saving staircase lighting,
«NewRide» for electric bikes and the «Goldener
Stecker» for prize-winning powersaving
lights), a new campaign followed
in September 2005 for heat pump
clothes-dryers. In the first four months
40 units were already sold at greatly
reduced prices by means of the development
contributions.
2005 2004
CHF % CHF %
Electricity Savings Fund payments.
Renewable energy sources 1597810 28.7 1675060 25.7
Energy-saving measures,
Energy-saving appliances 404534 7.3 707516 10.9
Usage environmental heat 2333586 41.9 3079436 47.3
Research and development 313000 5.6 142140 2.2
Energy consulting at UGZ 920000 16.5 900000 13.8
Administrative costs 3500 0.1 4600 0.1
Total 5572430 100.0 6508752 100.0
32
33

Finance
Finance 2005.
Pleasing figures once again.
Overview.
Annual profit increased.
In the report year, the overall performance
amounted to CHF 630.1 million and
therefore lies CHF 4.2 million below the
value for the previous year. With energy
sales, we recorded a slight decrease
of CHF 2.6 million to CHF 579.4 million.
Through the omission of transit charges
as a profit and loss position (settlement
of this credit balance with the costs
for the managing company), the position
«Other operational deliveries and services»
was reduced by CHF 5.5 million in
comparison with the previous year.
Because of higher assets in own performance,
the other operational earnings
closed CHF 3.9 million better than in the
previous year.
The total operating expenditure amounts
to CHF 463.2 million and is therefore
CHF 44.8 million higher than in the previous
year.
In the report year, because of the lacking
inlets, on the one hand the available
storage was under great demand, on
the other hand, energy had to be bought
on a large scale. With energy procurement
therefore, we recorded an increase
in expenditure of CHF 33.5 million to
CHF 200.5 million.
The position «Material and outside services»
showed a slight increase in
expenditure of CHF 2.3 million to CHF
75.1 million.
The higher average number of employees
led to a higher personnel expenditure
of CHF 3.6 million to CHF 101.9
million.
Caused by the high investment volume
in the report year, the depreciation is
CHF 5.2 million higher than in the previous
year.
The position «Taxes» is around the same
amount as the previous year.
For other operating expenditure we
recorded a slight increase.
■
■
■
■
■
■
Caused by the higher average balance
of the tax office current account, the
financial earnings rose by CHF 1.9 million
to CHF 18.0 million.
In the report year, the tax expenditure increased
because of an extraordinary
charge for the existing leasing transactions.
For the temporary bonus campaign,
CHF 25 million was allotted to contingencies
which burdened the annual profit.
In addition, a further CHF 85.7 million net
was placed in the contingencies and
reserves.
The annual profit – that is the profit surrendered
to the revenue office – amounted
to CHF 59.2 million and is CHF 0.4
higher than in the previous year.
New investments in material assets
amounted to a total of CHF 69.5 million.
CHF 13.2 million was invested in power
station facilities, CHF 6.8 million in
distribution facilities and CHF 27.3 million
in other facilities (predominantly energy
services facilities).
35

Finance
Income statement.
1 st January to 31 st December 2005.
Finance
Balance.
Assets and liabilities as per 31 st December 2005.
The income statement presented is still
subject to approval by higher authorities.
2005 2004
CHF
CHF
Energy output 579443861 582025321
Other operational deliveries and services 34733209 40252319
Other operating earnings 15968301 12056489
Total overall performance 630145371 634334129
Energy procurement 200517519 167041735
Material and outside services 75079410 72750643
Personnel expenditure 101894228 98310267
Depreciation 37704434 32519110
Taxes 15409733 15804101
Other operating expenditure 32610920 31943742
Total operating expenditure 463216244 418369598
Operating result before interest and taxes 166929127 215964531
Financial earnings 18043676 16155419
Taxation – 15038447 – 8848024
Allocation of contingencies and reserves – 110730121 – 164432100
Annual profit 59204235 58839826
Energy output.
This position contains the energy sales in the city
of Zurich and in the sales territories in the Grisons, the
energy sales to other plants as well as energy trading.
Other operational deliveries and services.
These consist of the proceeds from installation work
and services as well as sales of material and commercial
goods.
Other operating earnings.
This position presents: Third-party reimbursements,
insurance benefits, other remunerations, own funding
and cost contributions.
Energy procurement.
On the one hand, this concerns the annual costs of
partner companies that are – as for produced energy
– to be considered in relation to the participation
quota and, on the other hand, the costs of energy
purchases from third parties.
Material and outside services.
This position contains all expenditure for maintenance,
repair and replacement of production facilities,
machines, vehicles and movables.
Personnel expenditure.
Apart from salaries, all social benefits and personnel
relevant expenditure are included in this position.
Depreciation.
The depreciation is based on the customary useful
life of the individual installation categories.
Taxes.
The main part of this position is presented by the
water rates and waterworks taxes.
Other operating expenditure.
This is made up of the remaining operating expenditure
such as property insurance, rent, fees, contributions,
etc.
Financial earnings.
This position mainly contains the income from dividends
on our shareholding in partner companies
as well as the interest on the revenue office current
account.
Taxation.
Included in taxation are the expenditure for income,
wealth and property taxes as well as extraordinary
charges for existing leasing transactions and the
changes in latent taxes.
Allocation of contingencies and reserves.
This concerns allocations to the contingencies for
the bonus campaign as well as to the reserves for
energy compensation.
2005 2004
CHF
CHF
Assets.
Material assets 559094000 527305000
Financial assets 127092 000 123961000
Total fixed assets 686186000 651266000
Stocks 7878181 8182069
Receivables for deliveries and services 56680853 56960324
Active transitory items 5897091 0
Current account revenue office 365222056 345094206
Liquid resources 1854265 141698
Total floating assets 437532446 410378297
Total assets 1123718446 1061644297
Liabilities.
Reserves for energy compensation 798184939 738704764
General reserves 9797300 7411900
Net profit 59204235 58839826
Total equity capital 867186474 804956490
Contingencies
Contingencies from leasing 125733003 127256265
Short-term liabilities
Liabilities from deliveries and services 45181107 44878606
Downpayments and installments from customers 62734584 58909636
Passive transitory items 22883278 25643300
Total loan capital 256531972 256687807
Total liabilities 1123718446 1061644297
36
37

Finance
Balance.
The details.
Finance
Cashflow account.
A comparison of the years 2004 and 2005.
Construction/ Accumulated Book Value
Procurement Value Depreciation
CHF CHF CHF
Material assets.
Power stations 505431586 473661586 31770000
Transmission systems 284010602 170911602 113099000
Distribution systems, public lighting installations,
contracting facilities 1144340401 765647401 378693000
General installations, properties, land 216120828 180588828 35532000
Total 2149903418 1590809418 559094000
Share Capital of which paid in Share ewz Book Value
CHF CHF % CHF
Financial assets.
AG Kraftwerk Wägital 15000000 15000000 50.0 7500000
Kraftwerke Oberhasli AG 120000000 72000000 16.6 12000000
Maggia Kraftwerke AG 100000000 100000000 10.0 10000000
Blenio Kraftwerke AG 60000000 60000000 17.0 10200000
Kraftwerke Hinterrhein AG 100000000 100000000 19.5 19500000
AG für Kernenergiebeteiligungen 90000000 90000000 20.5 18450000
Kernkraftwerk Gösgen-Däniken AG 350000000 290000000 15.0 43500000
Total interests in power station companies 121150000
Kieswerk Albula AG 1200000 1200000 33.3 200000
ETRANS AG 7500000 7500000 12.9 963000
Swissgrid AG 15000000 15000000 12.9 1927000
SMOP, Swiss Mountain Power AG 102000 102000 33.3 22000
Swisspower AG 1612000 1612000 29.6 477000
ewzert ag 100000 100000 100.0 100000
Geopower Basel AG 3880000 3880000 8.2 320000
EEX European Energy Exchange AG 230000
Total interests in other companies 4 239000
VUE, Verein für umweltgerechte Elektrizität 100000
Loan ewzert ag 400000
Loan Geopower Basel AG 1088000
Temporary loan flooding Wettingen 115000
Total 127092000
2005 2004
CHF
CHF
Annual profit 59204235 58839826
Depreciation 37704434 32519110
Change contingencies and reserves 60342313 118057030
Acquired resources (cashflow) 157250982 209415966
Change stocks 303888 36870
Change accounts receivable 279471 9375711
Change active transitory items – 5897091 0
Change liabilities 302501 2052559
Change downpayments and installments from customers 3824948 – 12772822
Change passive transitory items – 2760022 – 15043600
Cashflow from commercial activities 153304677 193064684
Investments in material assets – 69460589 – 40193110
Investments in financial assets – 3482845 – 400000
Disinvestments of financial assets 319000 20000
Cashflow from investment activities – 72624434 – 40573110
Change liabilities towards revenue office – 20127850 – 97354442
Surrender to revenue office – 58839826 – 55209533
Cashflow from financial activities – 78967676 – 152563975
Total cashflow 1712567 – 72401
Liquid resources at beginning of accounting period 141698 214099
Liquid resources at end of accounting period 1854265 141698
38
39

Facts and figures in detail
Facts and figures in detail.
Appendix.
Energy procurement.
1 st October 2004 to 30 th September 2005.
Winter Summer Year Winter Summer Year
GWh GWh GWh in % of average production
1. Production from own hydroelectric plants.
Bergeller Kraftwerke
Castasegna 132.6 118.5 251.1 104 74 87
Bondo 3.9 11.4 15.3 130 71 81
Löbbia–Albigna 99.9 31.6 131.5 104 132 110
Löbbia–Forno and Plancanin 6.9 30.2 37.1 138 82 88
Lizun 4.8 11.8 16.6 120 69 79
Juliawerke
Tinizong 92.6 73.8 166.4 94 65 78
Tiefencastel-Ost 74.5 58.8 133.3 96 68 81
Tiefencastel-West 16.1 40.3 56.4 73 72 72
Albulawerke
Sils and residual water generator Solis 27.5 55.7 83.2 83 70 74
Rothenbrunnen
and KHR residual water generator 69.7 105.1 174.8 83 86 85
Heidbachwerk
Solis 2.9 16.7 19.6 32 83 67
Limmatwerke
Letten 9.2 13.5 22.7 92 113 103
Höngg 3.7 4.3 8.0 123 108 114
Wettingen 45.2 80.0 125.2 70 100 86
Total 1 589.5 651.7 1 241.2 92 79 85
2. Production from partner plants.
Hydroelectric plants
AG Kraftwerk Wägital 35.0 27.0 62.0 70 180 95
Kraftwerke Oberhasli AG 139.3 211.7 351.0 116 95 102
Maggia Kraftwerke AG 0 0 0 – – –
Blenio Kraftwerke AG 81.2 52.3 133.5 99 70 85
Kraftwerke Hinterrhein AG 148.9 116.1 265.0 110 77 93
Subtotal 404.4 407.1 811.5 104 88 95
Nuclear power stations
AKEB 544.5 374.3 918.8 105 86 96
Gösgen 639.1 489.5 1128.6 100 92 96
Subtotal 1 183.7 863.8 2047.5 102 89 96
Total 2 1 588.1 1 270.9 2859.0 103 89 96
3. Purchases from third parties.
Refuse incineration plants 12.2 33.3 45.5
Plants in the Grisons 1.7 17.2 18.9
Other purchases (incl. EEA) 621.2 573.7 1194.9
Total 3 635.1 624.2 1259.3
4. Own procurement of resale communities and self-producers.
Resale communities in the Grisons 71.6 25.9 97.5
Total 4 71.6 25.9 97.5
in % of last year
5. Total energy procurement.
Total 1 to 4 2884.3 2572.7 5457.0 104 96 100
41

Facts and figures in detail
Energy output.
1 st October 2004 to 30 th September 2005.
Facts and figures in detail
Energy usage.
City of Zurich according to branches of industry.
Change from
Winter Summer Year previous year
GWh GWh GWh GWh %
1. Output in Zurich.
Private households 351.8 329.3 681.1 11.0 1.6
Industry, trade 166.7 163.1 329.8 2.3 0.7
Services 545.0 530.0 1075.0 25.6 2.4
Other 415.8 396.4 812.2 3.5 0.4
Total 1 1479.3 1418.8 2898.1 42.4 1.5
2. Output in the Grisons.
Private households 12.8 8.5 21.3 1.2 6.0
Industry, trade 54.8 66.8 121.6 5.2 4.5
Agriculture 1.4 1.2 2.6 0.3 13.0
Subtotal 69.0 76.5 145.5 6.7 4.8
Resale communities and cantons 164.6 84.8 249.4 12.4 5.2
Output from own acquisitions 71.0 24.8 95.8 0.9 1.0
Transmission/distribution losses 6.7 5.5 12.2 – 2.3 – 15.9
Total 2 311.3 191.6 502.9 17.7 3.6
3. Output in sales area.
Total 1 and 2 1790.6 1610.4 3401.0 60.1 1.8
4. Storage pumps.
Total 4 56.5 96.8 153.3 19.7 14.7
5. Output to third parties.
Total 5 1037.2 865.5 1902.7 – 71.4 – 3.6
6. Total energy output.
Total 3 to 5 2884.3 2572.7 5457.0 8.4 0.2
Winter Summer Year Last
GWh GWh GWh GWh
Total electricity consumption in the city of Zurich.
ewz electricity output in Zurich (Total 1) 1479.3 1418.8 2898.1 2855.7
Coverage for own use
from independent power producers (see page 44) 45.2 38.2 83.4 86.3
Total 1524.5 1457.0 2981.5 2942.0
The detailed values for the output in Zurich are based on the values from the previous year.
2005 1995 Average
GWh
GWh yearly change
%
1. Private households.
Single-family homes 66.5 60.6 1.0
Apartment blocks (incl. general purchase) 614.6 572.0 0.8
Total 1 681.1 632.6 0.8
2. Industry, trade.
Agriculture 3.5 3.8 – 0.8
Food, beverages 92.1 92.0 0.0
Wood, paper, graphics industry 90.7 95.0 – 0.5
Metal, machines 91.3 96.7 – 0.6
Building, stone, earth 25.7 23.7 0.8
Various production companies 26.5 23.0 1.5
Total 2 329.8 334.2 – 0.1
3. Services.
Banks 255.0 236.2 0.8
Insurance companies, offices 277.6 238.7 1.6
Department stores 64.9 58.2 1.2
Shops, other trades 159.3 144.2 1.0
Post, transport companies, travel agents 152.0 139.3 0.9
Hotels, restaurants 166.2 152.7 0.9
Total 3 1075.0 969.5 1.1
4. Other.
Electricity, gas, remote heating 13.8 12.7 0.9
Public lighting 22.3 30.9 – 2.8
Water supply 48.8 43.5 1.2
Water protection (sewage plants),
refuse disposal 27.8 26.3 0.6
Traction current for public
transport companies 93.6 81.7 1.5
Public administration 35.7 36.4 – 0.2
Schools 142.5 138.5 0.3
Culture, entertainment, sport 42.2 36.6 1.5
Hospitals, homes, public health 109.0 98.1 1.1
Various services 148.5 136.4 0.9
Transmission/distribution losses
and transitional outputs 128.0 92.9 3.8
Total 4 812.2 734.1 1.1
Total Zurich 2898.1 2670.3 0.9
The detailed values 2005 are based on the values for the previous year.
Private households (GWh)
1000
800
600
400
200
0
80 85 90 95 00 05
Industry, trade (GWh)
1000
800
600
400
200
0
80 85 90 95 00 05
Services (GWh)
1000
800
600
400
200
0
80 85 90 95 00 05
Other (GWh)
1000
800
600
400
200
80 85 90 95 00
0
05
42
43

Facts and figures in detail
Independent power producers (IPPs) in the city of Zurich.
Facts and figures in detail
Public lighting.
Zurich city lights.
Electricity production, delivery to ewz and coverage of own requirements by IPPs.
Electricity production by IPPs
Plants Output Winter Summer Year
kVA MWh MWh MWh
1. Renewable energy.
Photo-voltaic 112 2 656.0 607 1764 2371
Hydroelectric power 1 768.0 695 938 1633
Biogas 1 15.0 18 20 38
Sewer gas 1 1890.0 6049 5485 11534
Total 1 115 5329.0 7369 8207 15576
2. Non-renewable energy.
Gas/diesel 40 26 544.6 26025 13646 39671
Refuse 2 33 950.0 29539 52890 82429
Total 2 42 60 495.6 55564 66536 122100
Total 1 and 2 157 65824.6 62933 74743 137676
Deliveries to ewz by IPPs Coverage of own requirements by IPPs
Winter Summer Year Winter Summer Year
MWh MWh MWh MWh MWh MWh
1. Renewable energy.
Photo-voltaic 568 1655 2223 39 109 148
Hydroelectric power 0 0 0 695 938 1633
Biogas 0 0 0 18 20 38
Sewer gas 0 0 0 6049 5485 11534
Total 1 568 1655 2223 6801 6552 13353
2. Non-renewable energy.
Gas/diesel 5175 1852 7027 20850 11794 32644
Refuse 11949 33075 45024 17590 19815 37405
Total 2 17124 34927 52051 38440 31609 70049
Total 1 and 2 17692 36582 54274 45241 38161 83402
Connected load
Number
kW
Installed facilities.
Street lamps public 40422 4679
Mercury discharge lamps 3044
High pressure sodium lamps 29484
Other lighting installations 8831 754
Street lamps private (incl. APG illuminated showcases) 1343 154
National and express roads 273 83
Total lighting points (58158 lamps) 50869 5670
Total lamps public lighting* 58158
*without lamps for private illuminated showcases APG
Maintenance work.
Lamp replacement 12895
Faults 127
Damage by third parties
Traffic island posts 87
Collisions with lampposts and masts 144
Acts of vandalism 665
Various repairs 1184
In the business year, the replacement quota amounted to
Replaced lamps 12895
= = 0.222
Number of lamps 58158
With a total connected load of 5670 kW
the 50869 lighting points consumed a
total of 22.31 GWh electrical energy.
60.88 kWh was consumed per resident.
Green power.
2005 2004
Plants Production Sales Plants Production Sales
MWh MWh MWh MWh
Production and Sales
Premium Solar 92 2877 2756 81 2416 2416
Premium Water 5 14669 14907 2 7780 7541
44
45

Facts and figures in detail
Low voltage connections.
Facts and figures in detail
Customer structure.
Number
500 V 150
230/400 V 31053
Total 31203
Number of customers
Household rate 198280
Normal rate small purchase 57350
Normal rate large purchase 4840
Total low voltage 260470
Total medium voltage 370
Total customers 260840
Number
Meter readings 422950
Invoices 1519800
Energy metering and clocks.
Energy services.
Number
Units in operation: Zurich and the Grisons
Meters for energy measurement 279053
Time switches 63
Ripple control receivers 36475
Heavy current relays and small contactors 29115
Master clocks 553
Public clocks 340
1 st January to 31 st December 2005
2005 2004 2003 2002
Delivered energy 59.4 GWh 39.3 GWh 28.5 GWh 23.2 GWh
Water for heating/cooling 1016129 m 3 682613 m 3 – –
CO 2 reduction 6134 t 5283 t 3648 t 3135 t
Installations in operation 104 88 45 26
Installations under construction 8 5 31 7
Planned installations 17 12 15 10
Employees.
2005 2004
Zurich 754 728
Grisons 90 91
Apprentices Zurich 37 34
Apprentices Grisons 4 4
Total 885 857
Full-time
Women 66 65
Men 723 702
Total full-time 789 767
Part-time
Women 29 36
Men 26 35
Total part-time 55 71
Proportion of women 11.8 % 12.5 %
Women in management 5 4
Municipal pension fund.
Degree of coverage 133.2 % (prov.) 121.8 %
Savings contribution employer * 62 % 62 %
Savings contribution employee * 38 % 38 %
* of the co-ordinated salary
Status 31 st December 2005
46
47

Facts and figures in detail
Transmission and distribution facilities.
Installations and lines in Zurich and the Grisons.
Facts and figures in detail
Distribution grid Zurich.
Construction and projects.
Number in supply area
Zurich Mittelbünden Bergell Output power
kVA
Installations.
Substations
380/220 kV 1 600000
220/150 kV 4 1124500
220/60 kV 1 145000
150/22 kV 1 100000
150/22/11 kV 6 733500
150/11 kV 8 1 682500
60/11 kV 4 62500
11/11 kV 1 2 30000
Interconnection points
60 kV 8 242300
11 kV 41 1 127635
400/230 V 15 40 18475
Total 20 71 43 3866410
Transformer stations
500 V 9 7940
400/230 V 689 1 109 1193277
Medium voltage customer connections 137 695350
Rectifier stations for transport companies 42 2 70700 kW
1
of which 574 stations equipped for 22 kV
2
of which 41 stations equipped for 22 kV
Overhead lines
Cable
km
km
Transmission lines.
380 kV 148.9 0
220 kV 366.7 0
2005 2004
km
km
Grid construction in the city of Zurich.
(Cable extensions and dismantling)
Cable laying 46.5 40.7
Low voltage cable 32.2 33.8
Medium voltage cable 13.8 6.9
High voltage cable 0.5 0.0
Dismantling 25.1 18.4
Low and medium voltage cable 25.1 18.0
High voltage cable 0.0 0.4
2005 2004
Distribution grid Zurich.
(Projects and constructions in detail)
Medium and low voltage distribution cable projects 42 76
Grid renewal and extension medium voltage 6 9
Grid renewal and extension low voltage 4 12
In connection with construction work on transformer
stations and installations of medium voltage customers 18 17
Initiated by third parties, temporary arrangements 14 38
Projects for telecommunications companies 43 37
Construction of transformer stations 10 5
Construction of installations for medium voltage customers 1 1
Conversion of transformer stations 7 9
Conversion of rectifier stations 1 1
Conversion of installations for medium voltage customers 4 0
Construction of temporary transformer stations 0 3
Extension of transformer stations and
installations for medium voltage customers 0 0
NISV renovations 7 17
Dismantling of stations 2 3
Overhead lines in supply area km
Cable in supply area km
Zurich Mittelbünden Bergell Zurich Mittelbünden Bergell
Distribution lines and cables.
150 kV 72.6 83.6
110/50 kV 17.5
60 kV 144.1
22/11 kV 120.6 21.0 839.9 1 53.3 21.9
500 V 26.5
400/230 V 11.7 39.1 2027.1 233.2
Public lighting 19.7 1447.5
1
of which 652.2 km of 20 kV cable (= 77.6% of all medium voltage cables)
48
49

Facts and figures in detail
Operation and maintenance.
Reliability and faults.
Facts and figures in detail
Company structure.
The organigram.
Average 2001–2005 Standard value
Reliability figures for the city of Zurich.
Unplanned non-availability of distribution grid capacity * 79.5 MVAh 100 MVAh
Average number of faults 83.2 100
Proportion of faults with fulfiled Zollenkopf criteria (value from 2005) 95 % 90 %
Proportion of faults with unfulfilled Zollenkopf criteria (value from 2005) 5 % 10 %
Average interruption duration per customer and year (SAIDI) ** 3.1 min. 33 min.
Average interruption-free time per customer (SAIFI) ** 11.4 years 3 years
Average interruption duration of an affected customer (CAIDI) ** 35 min. 100 min.
* The reliability is expressed by the unplanned unavailability of grid components. A transformer of 33 MVA unavailable for 1 hour results in
an unavailability of 33 MVAh. The actual load of the transformer before the breakdown is irrelevant.
Law
Balthasar Brandner
Personnel
Philipp Hatt
Department of Public Utilities and Transport of the City of Zurich
Town Councillor Andres Türler
Director
Dr. Conrad Ammann
Management
Secretary
Angela Schwarz
** Reliability figures according to international standard IEEE. A customer has to reckon with an average interruption duration of 3.1 minutes
per year (SAIDI). Such an event affects him on average every 11 years (SAIFI). If such an event occurs, the customer is supplied with energy
within 35 minutes (CAIDI) on average.
Production
Gino Romegialli
Transmission
Network
Gino Romegialli
Distribution Network
Jürg Streich
Market and
Customers
Bruno Hürlimann
Finance and Services
Marcel Frei
Large Projects
Alfred Schürch
Controlling
Martin Bamert
Controlling
Martin Bamert
Operation and
Maintenance
Hans-Rudolf Bühler
Controlling
Matthias Aellen
Controlling
Rupert Möstl
Management
Systems
Gerhard Emch
1 st October 2004 to 30 th September 2005
Controlling
Martin Bamert
Transmission Lines
Jürg Herren
Network Design
Hansruedi Luternauer
Operation
Hans-Rudolf Bühler
Corporate
Communications
Harry Graf
Accounting
Anton Stäbler
Telematics
Daniel Heinzmann
Faults in the transmission systems.
(50 kV, 150 kV, 220 kV, 380 kV)
2005 2004
Number
Number
Building Technology
Dr. Frits de Vries
Andreas Siegfried
Plants and Rights
Michael Roth
Network Support
Angel Gallego
Station Maintenance
Hans Schwarzenbach
Market Development
Daniela Küng
Financial Accounting
Doris Joos
Operational
Applications
Ben Zion Oberlin
Grounds and short-circuits in neighbouring grids 25 35
Grounds and short-circuits in the ewz grid 5 1
Partial interruptions in Zurich 0 2
Partial interruptions in the Grisons 1 5
Faults in the distribution systems Zurich.
Rectifiers 0 0
11 kV 7 12
22 kV 9 3
Power grid 500 V 1 0
Standard grid 230/400 V 60 71
Total 77 86
The faults were caused by:
Overload 0 9
Control 4 4
Fittings and connections 11 7
Material faults 3 1
Weather influences 5 3
Damage by third parties (hand tools and building machinery) 32 41
Nature, animals 4 6
Water, fire, pollution 0 0
Miscellaneous 8 10
Unknown causes 10 5
Power Stations
on the Limmat
Christoph Busenhart
Bergell Power
Stations
Andres Fasciati
Mittelbünden
Power Stations
Markus Clavadetscher
Mittelbünden
Distribution Network
Beda Kaufmann
Management
Equal Opportunities Representative
Regula Bel Kadhi
Data Protection Representative
Andreas Züger
Environmental Representative
Gino Romegialli
Energy Trading
Gino Romegialli
Controlling
Martin Bamert
Energy Management
Willi Nürck
Documentation
Werner Wanner
Co-ordination
Walter Haas
Electrical
Installations
Christoph Girsperger
Technology
and Safety
Ueli Bürgi
Network Services
Dr. Lukas Küng
Metrology
Werner Pfister
Lighting
Peter Schriber
Substation
Maintenance
Peter Fessler
Planning and
Construction
Walter Funk
Lines Right
Antonio Martinelli
Lines Left
Frank Maurus
Stations
Walter Aebli
Substations
Markus Lehner
Renewable Energies
Arnold Vonbank
Large Customers
Markus Sägesser
Small Business
Customers
Ulrich Iten
Private Customers
Hans Abplanalp
Energy Services
Georg Dubacher
Telecommunications
Peter Messmann
Sales Services
Bernhard Fivian
General Serivices/
Property
Walter Weber
Procurement and
Logistics
Marcel Frei (a. i.)
Logistics
Markus Denzler
Purchasing
Felix Keller (a. i.)
Project Procurement
Armin Lichtsteiner (a. i.)
Technical
Applications
Dr. Jürg Fehlmann
Network Control
Technology
Reto Bondolfi
System Technology
Urs Mantel
Telephony
Fritz Gurtner
Office Automation
André Treuthardt
With 15 of the 77 faults, the power supply was interrupted for a maximum of 30 minutes,
with 11 for 31 to 60 minutes and with 51 for more than one hour.
Safety Representative
Gottlieb Fröhlich
50
51

Imprint.
Co-ordination/
Editing
Translation
Design/Production
Photos
ewz, Carla Stoppini,
Corporate Communications
and Hansheinrich Leuthold, Zurich
Techlingua, Jennifer Pentland
Atelier Leuthold, Zurich
Beat Müller, Zurich
Cover: Taiyo Onorato and Nico Krebs
(Winner of «The Selection vfg 2004»)
Issue April 2006
Reproduction permitted if the source is indicated.
Publisher
ewz
Tramstrasse 35
8050 Zurich
Phone +41 (0)58 319 41 11
Fax +41 (0)58 319 41 80
info@ewz.ch
www.ewz.ch
ewz – Partner of Swisspower
Further Information?
Current documentation on company
activities can be requested free of charge
from ewz or can be found in internet.