Subscriber Login

Data & Statistics

South Africa: Planned Generation and Transmission Capacity [free access]

August 13, 2021

Eskom prepares an annual Transmission Development Plan (TDP), which provides an outline of the future power system of South Africa. Eskom’s TDP is driven by two goals—integration of new upcoming generation capacity, mainly renewable, and refurbishment of the existing aged infrastructure. As per South Africa’s TDP 2021–30, the electricity demand under the moderate growth scenario is expected to grow at a CAGR of 1.62 per cent between 2021 and 2030 to reach 41.8 GW by 2030.

 

The country is expected to meet this demand by adding close to 30 GW of new generation capacity, which is expected mainly from renewable energy sources in regions with limited network infrastructure. Of the 30 GW, around 51 per cent will be solar- and wind-based, 26 per cent will be gas/diesel-based, another 15 per cent will be coal-based and the remaining 8 per cent will be hydro-based.

 

Figure 1: Expected growth in electricity demand in South Africa (GW)

 

Note: National electricity demand forecast under moderate growth scenario by Eskom

Source: Eskom’s TDP 2021–30; Global Transmission Research

 

As per the updated TDP 2021-30, the country is expected to add close to 8,256 km of transmission lines and 52,125 MVA of transformation capacity during the 2021-30 period. Majority of the additions will be at 400 kV, with close to 6,196 km of transmission lines. Further, the power utility is planning to invest close to ZAR118 billion to strengthen the transmission system, and refurbish and upgrade its network to meet the high influx of renewable energy in the future.

 

Figure 2: Share of transmission line length and transformation capacity by 2021-30

 

Source: Eskom’s TDP 2021–30; Global Transmission Research

 

In addition to strengthening its domestic grid, Eskom is planning to execute several cross-border projects such as the Botswana–South Africa (BOSA) project, which involves a 210-km-long, 400 kV transmission line that will connect Isang (Botswana) to Watershed (South Africa) and the proposed Watershed B substation; and the MoZiSa project, which proposes to link three Southern African Development Community (SADC) countries—Mozambique, Zimbabwe and South Africa. The table below lists some of the key transmission projects that are either being implemented or will be implemented across the country.

 

Table 1: Key transmission projects

Name of project

Voltage (kV)

Length (km)

Scheduled completion

MoZiSa transmission project

400

935

2022

BOSA transmission project

400

210

2024

JHB East strengthening: North Rand integration

132, 275 and 400

NA

2027

JHB North strengthening Phase 2

275

NA

2024

KZN 765 kV strengthening: Empangeni integration

400 and 765

NA

2023

KZN 765 kV strengthening: 400 kV lines

400

NA

2031

Tubatse Strengthening Scheme Phase 2

400

NA

2022

Tubatse Strengthening Scheme Phase 1

275 and 400

NA

2025

Grand Inga Phase 1 A transmission integration

NA

To be decided

To be decided

Note – BOSA: Botswana–South Africa; JHB: Johannesburg; KZN: KwaZulu-Natal; MoZiSa: Mozambique–Zimbabwe–South Africa

Source: Global Transmission Research