DTEK and Fluence have started commissioning Ukraine’s largest battery energy storage project, a 200MW portfolio across six sites capable of storing 400MWh of electricity.
The partners said the systems are entering final testing and are scheduled to begin commercial operations in October 2025 under contract with Ukrainian grid operator Ukrenergo.
Each site ranges from 20MW to 50MW, with a combined capacity sufficient to supply 600,000 homes for two hours.
The project, announced at the Ukraine Recovery Conference in Rome, marks the first major energy deployment since the US–Ukraine Economic Partnership Agreement was 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 storage systems will provide frequency response, power reserve and balancing services to support grid stability and reduce the need for rolling blackouts.
Fluence chief executive Julian Nebreda said the company’s remote commissioning model was key to delivery 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,” he said.
“It is also one of the most impactful projects in our company’s history.”
Fluence said it has installed 698 Gridstack cubes across the six sites and trained 20 Ukrainian engineers in Germany and Finland to operate and maintain the systems.
The company will continue to support commissioning remotely through diagnostics, testing and performance monitoring.