Transmission Ten-Year Development Plan 2011-2020 - Eskom

of 100MW which represent a cumulative total of
generation at that point. They are connected directly to
the 132kV busbars of existing MTS substations.
The four MTS substations are:
• Juno (2011)
• Proteus (2011)
• Aurora (2012)
• Bacchus (2012)
In addition, it is assumed that the Eskom 100MW
wind farm at Sere will also be established in 2011 and
integrated as per the study proposal.
Since these are intermittent sources of generation in
the TDP studies, they are studied under two conditions,
namely:
• Zero output at system peak
• Full output at system peak
This is to determine the capacity and potential weakness
under both generation conditions.
It is acknowledged that significantly more wind
generation may be connected to the network before
2020. However, it is difficult to determine the exact
transmission requirements for the TDP without the
actual location and size of the wind farms. Taking into
account that the normal average load factor of wind
farms is of the order of 35%, this means that they will
not have a significant impact on the capacity design of
the network. The applications for wind farms will be
handled on a case by case basis, but only the above
allocated 500MW of wind generation has been included
in the TDP studies.
Moamba OCGT Generation
The Moamba project is a proposed OCGT power
station in Mozambique, situated approximately 30km
from the South African border near Komatipoort.
The power station will be integrated by looping in the
existing 275kV line to the site. In addition, a new 60km
400kV line energised at 275kV will be constructed from
the Moamba site directly to the 400/275kV substation
in Maputo. A new 275kV line (60km) between the
Moamba site and the Infulene substation in Maputo is
also proposed.
The Moamba total capacity is 664MW, modelled as two
332MW units. This will be a base load power station
which will be run during system peak, but can be scaled
down during low load conditions if required.
Ingula pumped storage
The Ingula pumped storage power station is an
approved project which is assumed to have units 1 and
2 completed in 2013 and units 3 and 4 completed in
2011 as per the project schedule.
Base Load Coal
The Base Load Coal power stations at Medupi and
Kusile are approved projects; the new units of which
are assumed to be completed between 2012 and 2017
as per the project schedules and in line with the IRP.
An additional base load coal power station is required,
which is assumed to be the proposed Coal 3 power
station at Lephalale, close to the Medupi site. The first
unit will come on line in 2017 with an additional unit
each year until there are 4 units by 2020. This is in line
with the IRP. The assumed size is 750MW units with a
projected sent out power of 714MW per unit.
Nuclear 1 Generation
The Nuclear 1 site, selected for the purposes of the
TDP, is the Thuyspunt site near Port Elizabeth. Although
it is acknowledged that the site selection has not been
completed, the Thuyspunt site is the preferred site from
a transmission aspect. The initial unit size is assumed
to be a 1500MW unit for the purposes of the TDP
studies in line with the IRP assumption. Obviously, the
integration requirements will change if a different site is
selected, and may change if the size or the number of
units change.
© Eskom 2011 5