Transmission Ten-Year Development Plan 2011-2020 - Eskom

Cape Corridor 765kV – Phase 4
• Construct the second Zeus-Perseus-Gamma-Omega 765kV line 2017
If there is no nuclear generation in the Cape then the Main Cape Corridor will have to be reinforced again around
2020. The reinforcement may be HVDC, in light with the current strategic grid plan.
6.7.2 CAPE PENINSULA CLN
The 400kV in-feeds into Muldersvlei, Stikland and Acacia nodes provide N-1 redundancy but the Acacia-Philippi infeed
will reach capacity in 2012. The proposed 2nd Koeberg-Acacia 400kV line will ensure continued N-1 redundancy
for Acacia beyond 2012. Firgrove substation will be needed to supply Somerset West and surrounding areas.
To address the Philippi transformation capacity problem, it is proposed to establish a new 400/132kV substation in the
Mitchells Plain area to relieve the loading at Philippi by constructing two 400kV lines from either Stikland or Firgrove
substation. There is a proposal to convert units at Ankerlig from OCGT to CCGT, starting in 2020. This would require
an Ankerlig-Omega 400kV line to meet Grid Code requirements. It has been omitted from the TDP due to the
uncertainties regarding the project.
The projects within the Cape peninsula CLN are as follows:
• Acacia 3rd 500MVA 400/132kV transformer 2010
• Philippi 3rd 500MVA 400/132kV transformer (spare) 2013
• Koeberg off-site Supply relocate & Associated work 2012
• Firgrove 400/132kV substation 2014
• Muldersvlei 3rd 500MVA transformer & Series Reactor 2013
• Mitchells Plain 400/132kV substation 2016
6.7.3 WEST COAST CLN
The West Coast, Namaqualand, and parts of the Peninsula CLN are supplied via the Hydra-Aries-Aurora power
corridor. It is proposed to create a new Ferrum-Aries 400kV power corridor once both the Mercury-Ferrum and
Epsilon-Ferrum 400kV corridors have been established.
Sishen-Saldanha traction upgrade
In addition to the strengthening projects, the Sishen-Saldanha traction upgrade project would result in the establishment
of four new 400kV traction substations, one new 275kV substation, two SVCs, and the Aries-Nieuwehoop 400kV line.
Although the 275kV infrastructure will be in the Kimberley CLN, it is listed here because it is an integral part of the
Sishen-Saldanha traction upgrade scheme.
The strengthening projects within the West Coast CLN are as follows:
• Construct the Aries SVC 2016
• Construct Sishen Saldanha Phase 1 (1x275/50kV s/s + Garona SVC) 2012
• Construct Sishen Saldanha Phase 2 (4x400/50kV s/s + Aries-Nieuwehoop line) 2014/2015
• Construct the Ferrum-Nieuwehoop 400kV line 2016/2017
• Upgrade Juno to 2x80MVA, 132/66/22kV transformers 2016/2017
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