Ukrainian energy company DTEK and US-based Fluence have begun commissioning a 200 MW battery energy storage portfolio across six sites, marking the country’s largest project of its kind. The systems, with a combined storage capacity of 400 MWh, are scheduled to start commercial operations in October 2025 under contract with the Ukrainian grid operator Ukrenergo.
Each site ranges between 20 MW and 50 MW, with the total capacity able to supply roughly 600,000 homes for two hours, the partners said.
The project, unveiled at the Ukraine Recovery Conference in Rome, is the first significant energy infrastructure deployment following the US-Ukraine Economic Partnership Agreement signed in April.
DTEK Chief Executive Maxim Timchenko said, “With our partner Fluence we are fast-tracking innovation, building homegrown technical expertise and showing that even in wartime, progress is achievable. This battery storage facility is proof of our determination to build back stronger.”
The battery systems will support grid stability by providing frequency response, power reserve, and balancing services, helping to reduce reliance on rolling blackouts.
Fluence CEO Julian Nebreda highlighted the company’s remote commissioning capabilities as essential under wartime conditions. “The project with DTEK to build a strong and decentralised energy system for enhanced energy security in Ukraine is perfectly aligned with our mission. It is also one of the most impactful projects in our company’s history,” he said.
Fluence has installed 698 Gridstack battery cubes across the sites and trained 20 Ukrainian engineers in Germany and Finland to operate and maintain the facilities. The company will continue to provide remote support through diagnostics, testing, and performance monitoring during the commissioning phase.
