en.Wedoany.com Reported - Bulgarian renewable energy company Sunterra RE has completed the second phase of its battery storage project at solar parks in Galabovo, Kaloyanovo, and Karlovo, adding 1.3 GWh of storage capacity. The project brings total storage capacity to nearly 397 MW/1.3 GWh, with battery systems designed to provide up to four hours of storage, approximately 90% round-trip efficiency, and a 25-year operational lifespan.

The expansion uses lithium iron phosphate (LFP) systems, with a rated capacity of 150 MW/450 MWh in Galabovo, 150 MW/506 MWh in Kaloyanovo, and 97 MW/320 MWh in Karlovo. Sunterra stated that it has obtained operating permits, confirming that the facilities meet technical, regulatory, and safety requirements. The battery energy storage system project is self-funded and aims to store solar power for dispatch during peak demand periods.

By adding 1.3 GWh of storage capacity, the project increases the amount of dispatchable electricity available in Bulgaria during peak demand hours. It enables time-shifting of solar generation, storing electricity generated earlier in the day for release during demand surges, such as in the evening. This "peak shaving" capability helps reduce the need for power plants to operate at full capacity during the most expensive hours, decreasing reliance on peaking thermal units. With each charge-discharge cycle providing up to four hours of discharge, the new batteries are particularly advantageous for covering multi-hour peak windows. The equipment can also enhance grid flexibility through rapid power response, quickly balancing supply and demand during sudden demand spikes or fluctuations in solar output caused by cloud cover. Additionally, the system reduces renewable energy curtailment by storing excess solar power beyond immediate consumption. The three interconnected solar fields (Galabovo, Kaloyanovo, Karlovo) strengthen multi-point support capabilities, allowing peak power support to be distributed across multiple grid areas. The long operational lifespan (approximately 25 years) will also make peak dispatch capability a lasting grid resource.

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