Bulgarian renewable energy firm Sunterra RE has signed a deal with China’s Sungrow Power Supply to deploy more than 1 gigawatt-hour (GWh) of battery energy storage systems (BESS) across its three largest solar power plants in Bulgaria, the company said in a press release last week.

The agreement, which represents the second phase of Sunterra’s storage expansion strategy, will see Sungrow deliver its MV-Power Titan 2.0 system featuring lithium iron phosphate (LFP) battery technology and string energy conversion systems.

Sunterra said the new storage systems will help shift solar energy output from midday hours to periods of high demand, improve grid stability, reduce price volatility for consumers and enhance overall energy system security. The financial terms of the deal were not disclosed.

“This agreement is much more than a commercial transaction – it is a clear commitment to Bulgaria’s energy future,” said Emil Shopov, CEO of Sunterra RE.

The additional capacity will more than triple Sunterra’s current 300 megawatt-hours (MWh) of storage. Founded in 2023, the Plovdiv-based firm develops and operates renewable energy assets including solar, wind and hydrogen projects. Its portfolio includes a 208-megawatt (MW) solar park in Kaloyanovo and a 201-MW site in Galabovo.

Sungrow, one of China’s largest producers of solar and wind power equipment, reported having installed 740 gigawatts of power electronic converters globally as of end-2024.

The deal comes amid growing momentum in Bulgaria’s energy storage market. In July, German-Bulgarian developer Sunotec also partnered with Sungrow to deploy 2.4 GWh of BESS across projects in Bulgaria and wider Europe.

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