DTEK Group, in partnership with American company Fluence, has officially connected Ukraine's largest battery-based energy storage system to the grid. With a total capacity of 200 MW and the ability to store 400 MWh of electricity, the project is a milestone in Ukraine's energy. Ukraine's biggest private energy firm, DTEK, has launched a major battery storage facility that will bring power to hundreds of thousands of homes and strengthen the grid ahead of expected Russian attacks this winter, the company said. —. Construction took place from March to August 2025 and cost DTEK €125 million. Ukraine's Minister of Energy, Svitlana Hrynchuk, emphasized the strategic importance. This article explores how cutting-edge battery storage solutions are reshaping energy reliability, reducing carbon footprints, and supporting solar integration in Eastern Europe. The installation, which is spread over six sites in the Kyiv and Dnipropetrovsk regions, represents a significant investment of. In just six months — under shelling, blackouts, and wartime restrictions — Ukraine completed Eastern Europe's largest battery storage project: 200 megawatts / 400 megawatt-hours of clean, instant-power capacity — spread across six sites, powered by American technology, operated by Ukrainian.