Transmission Ten-Year Development Plan 2011-2020 - Eskom

The Northern Grid load growth is mainly due to platinum group metals (PGM) and ferrochrome mining and processing
activities located in the Rustenburg, Polokwane and Steelpoort areas. The load demand for the years from 2009 to
2020 is expected to reflect the average annual percentage load increases shown in Table 7-3-1 above.
The TDP Scheme Projects for the Northern Grid consist of extending the 400kV and 275kV networks as well as
establishing the 765kV network, the integration of two power stations (Medupi and Coal 3) and the installation of
additional transformers at existing and new substations.
These main schemes are as follows:
• Tabor and Spencer in the Polokwane area consists of 275kV and 400kV reinforcements.
• Rustenburg 400kV reinforcement.
• Medupi and Coal 3 power stations 400kV and 765kV integration.
• Brits 400kV reinforcement.
The TDP scheme projects for the North Grid consist of extending the 400kV and 275kV networks as well establishing
the 765kV network, the integration of two power stations (Medupi and Coal 3), and the installation of additional
transformers at existing and new substations. The increase in transmission assets by end-2015 and end-2020 and the
cumulative total are shown in Table 6.6.
Transmission Assets
for Northern Grid
Table 6.6 North Grid new transmission assets
New Assets expected
in 2011 - 2015
New Assets expected
in 2016 - 2020
Total New
Assets expected
Total kms of line 2,816 820 3,636
765kV Lines (km)
400kV Lines (km)
275kV Lines (km)
Total installed
Transformer MVA
700
2,116
0
0
670
150
700
2,786
150
3,820 9,500 13,320
Transformers (no. of) 10 8 18
Capacitors (no. of) 0 0 0
Reactors (no. of) 6 2 8
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