Rwanda Tenders 200 MW Floating Solar With 800 MWh Battery at Lake Sake
Rwanda's EDCL opened a tender for a 200 MW floating solar plant with a 200 MW/800 MWh, four-hour battery on Lake Sake. Prequalification bids are due Nov. 12; chemistry and supplier are not named.
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The Lake Sake tender pairs 200 MW of floating solar with a battery rated 200 MW / 800 MWh, according to ESS News and Green Building Africa.
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Rwanda's Energy Development Corporation Limited (EDCL) has opened a prequalification tender for a 200 MW floating solar plant paired with a 200 MW / 800 MWh battery energy storage system (BESS) at Lake Sake, according to ESS News and Green Building Africa. Applications are due Nov. 12, 2026.
The battery discharges for four hours, Green Building Africa reported. Its stated jobs are to serve evening demand, reduce solar curtailment, provide frequency and voltage support and supply black start capability after outages. The site is in Ngoma District, Eastern Province. EDCL is a subsidiary of the state-owned Rwanda Energy Group (REG).
Why the Lake Sake Battery Matters for Rwanda's Grid
The tendered battery is rated 200 MW, against 47.5 MW of operational solar in Rwanda, according to ESS News and Green Building Africa.
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The battery is large against the system it would join. The tender sits inside a $3.2 billion plan to lift national generation capacity from 467.14 MW to 1,066 MW by 2034, Green Building Africa said. By Voltgrid's arithmetic, a 200 MW discharge rating equals about 43% of that 467.14 MW starting figure.
Solar is still small in the country. The Africa Solar Industry Association tracks 47.5 MW of operational solar in Rwanda, ESS News said, so one project would multiply the solar fleet several times over and, with storage, move output into the evening peak.
The largest operating floating solar array in Africa is a 13 MW plant in Morocco that came online in July, per ESS News. The Lake Sake plant would be roughly 15 times that size. The biggest African floating project under development is a 600 MW scheme on Lake Kariba in Zimbabwe, which is to start with an initial 150 MW phase. Voltgrid News reported earlier on Italy's second FER2 floating solar auction.
Lake Sake Tender Terms and Bidder Requirements
The scheme is an independent power producer (IPP) structure. The chosen developer would design, finance, supply, install, test, commission, operate and maintain the plant, plus the grid evacuation infrastructure, under a 25-year power purchase agreement (PPA). REG, through its subsidiary Energy Utility Corporation Limited (EUCL), would be the offtaker, according to both outlets. Implementation is expected to take 18 months from project start.
Bidders need at least 10 years of experience in building and running renewable plants, Green Building Africa said. They must show average annual turnover of at least $300 million over 2023-2025, plus liquid assets of at least $60 million and a confirmed credit line of at least $60 million. Consortia are limited to two members. A mandatory site visit was set for Oct. 23, and the prequalification documents are on REG's website.
What Rwanda Has Not Confirmed on the Battery
Neither outlet names the battery chemistry, a supplier or a budget for the project. No bidder has been announced, and the tender is only at the prequalification stage. An addendum to the prequalification notice has already been issued, so terms may still shift. Voltgrid has not opened the tender documents themselves.
