Transmission Ten-Year Development Plan 2011-2020 - Eskom

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Chapter 5 deals with the national overview, which gives
a high level explanation of the planned transmission
infrastructure. This is intended to give a snapshot of the
major projects that are planned for the entire Ten-year
plan period and a high-level summary of the installed
transmission infrastructure.
Chapter 6 focuses on planned projects in detail and
the impact they will have on the network. Generation
integration and reliability projects are discussed per
Grid. In both instances, sites and servitudes are required
Transmission Ten-Year Plan 2011-2020
to accommodate substations and lines respectively. In
either case, the Environmental Protection Act requires
Eskom to conduct an Environmental Impact Assessment
(EIA) and obtain environmental approval, which includes
consultation with affected stakeholders, prior to construction.
Chapter 7 deals with the capital expenditure of the
ten-year plan.
Chapter 8 deals with various conclusions based on the
content of this document.
2. Load Demand Forecast and Generation Scenarios
2.1 LOAD FORECAST
Load forecasting is a fundamental requirement for a
Transmission planning cycle. Availability of sufficient
transmission network capacity in any country is
important for economic growth. Grid Planning, in
consultation with the relevant Distribution regions,
compiles a forecast per point of supply for the network
computer model.
The geographically differentiated loads indicate that
the growth rates and load profiles differ substantially
from one substation or area to another. The forecast
that was used for the 2011 – 2020 TDP (2010 TDP)
was developed using the 2009 July System peak load.
The effects of the economic crisis have resulted in a
significant impact on the demand in late 2008 and early
2009. Hence the load forecast presented in this report
indicates relatively smaller system load demand as
compared to the load forecast used in the 2010 – 2019
TDP (2009 TDP). See Figure 2-1, on the next page, that
illustrates the difference.
Due to the long lead times and EIA requirements, the
transmission planning studies were based on this load
forecast to provide enough time to initiate the necessary
transmission infrastructure projects. The forecasted
system peak demand for each year is given in Figure 2
1 on the next page including the percentage growth for
each year for the latest forecast:.