The Solis I Solar Thermal Power Plant – Thermal Energy Storage System is a 150,000kW energy storage project located in Upington, Northern Cape, South Africa.

The thermal energy storage project uses molten salt as its storage technology. The project was announced in 2016 and will be commissioned in 2021.


The Solis I Solar Thermal Power Plant – Thermal Energy Storage System is being developed by ACWA Power International and Sasol New Energy Holdings. The project is owned by Sasol New Energy Holdings (100%), a subsidiary of Sasol.

The key applications of the project are renewables capacity firming and renewables energy time shift.

Contractors involved

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By GlobalData

Sasol New Energy Holdings is the owner. ACWA Power International and Sasol New Energy Holdings are the developers. BrightSource Energy is the technology provider for the project.

About ACWA Power International

ACWA Power International (ACWA Power) is a power generation company. It is engaged in providing power and desalinated water at low cost efficiently. It also supplies electricity and potable water to its customers. It generates power through coal, oil, gas, thermal, solar and wind technologies. ACWA Power also offers operation and maintenance services to power and water desalination industry through its subsidiary, the First National Operations & Maintenance Company. The company has operations across the Middle East, Africa and Asia. ACWA Power is headquartered in Riyadh, Saudi Arabia.

About Sasol New Energy Holdings

Sasol New Energy Holdings (Pty) Ltd. (Sasol Energy) undertakes the generation, transmission, and marketing of electricity from natural gas and renewable sources. The company is a subsidiary of Sasol Limited. Sasol Energy is headquartered in Johannesburg, South Africa.


All publicly-announced energy storage projects included in this analysis are drawn from GlobalData’s Power IC. The information regarding the projects are sourced through secondary information sources such as country specific power players, company news and reports, statistical organisations, regulatory body, government planning reports and their publications and is further validated through primary from various stakeholders such as power utility companies, consultants, energy associations of respective countries, government bodies and professionals from leading players in the power sector.