Energy storage Eskom

Eskom’s flagship battery energy storage systems (BESS) project – EE Publishers

Eskom’s flagship battery energy storage systems (BESS) project <>
October 29th, 2018, Published in Articles: EE Publishers <>, Articles: Energize <>
by Prince Moyo, Eskom 38
. *This article discusses the flagship 360 MW/1440 MWh battery energy storage systems (BESS) project that has been launched by Eskom. It looks at storage technologies and their evolution, with particular reference to BESS of LiIon, NaS and redox flow battery technologies. Energy storage programmes that are being rolled out in the world are outlined. The various use cases of BESS are covered, such as energy arbitrage, peak clipping, frequency support, volt/var support, deferred transmission and distribution investment and quality of supply improvement, PV smoothing, renewable energy firming, spinning reserves and black start. Duty cycles expected of the BESS systems and the economics thereof for customers and utilities are explained. Finally, the article proposes some guidelines for the specification, testing, operation, maintenance and disposal of BESS systems and potential for wide-spread application on the South African power system.*
Eskom is South Africa’s electricity utility, responsible for 95% (220 TWh) of energy supplied within the country. The utility manages a power system with peak capacity of 35 GW. The power system in South Africa has evolved with the introduction of renewable energy independent power producers (REIPPs), while at the same time, energy sent out declined with an annual rate of 0,6% (Draft IRP 2018 <>, p.18).
Eskom’s share of the market has therefore not grown. The latest draft integrated resource plan with an outlook to 2030 has the following allocations: 7598 MW for PV and 11442 MW for wind. This represents a more than five-fold increase each for PV (2018:1484 MW) and wind (2018: 1980). In total, it moves PV and wind from 7,2% installed in 2018 to 25,6% installed in 2030, a 350% rise.
In its application for funding of the new large coal-fired power projects, Medupi and Kusile, each of which are 4800 MW in size, Eskom committed to executing power projects utilising clean technologies. The 100 MW Sere Wind Farm project is one. Plans for a 100 MW CSP plant were discussed in 2015 but it was resolved in 2017 that Eskom should rather roll out a project on distributed battery energy storage systems (BESS) with some PV. The sizing of the BESS would be similar to the energy the CSP would have generated, which is 1440 MWh per day or 525 GWh per year (100 MW at 60% load factor).
Internationally, storage programmes have been launched in the USA, Europe and China. The USA programme in California is called the Self-Generation Incentive Programme (SGIP) and in 2013 set a target of 1,3 GW of storage by 2020. The majority (85%) of this is utility-based with the balance being customer facing. The European Union has approved plans to inject €200-million into a programme to develop battery storage manufacturing capacity (*Energy Storage News*, 14 Nov 2017), in addition to €150-million already allocated.
Demand is expected to rise more than eleven-fold by 2025 (from 10 to 117 GWh per annum) by 2025. China is expected to trail only the US by 2022 in demand for battery energy storage (4 GW/10 GWh vs. 8 GW/21 GWh). The US DoE compiles a list of storage projects and publishes them on its website ( Anyone can submit their projects online.

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