FlexGen Power Systems, a battery energy storage software and service provider, has acquired Clean Energy Services (CES), a provider of commissioning, preventative, and corrective maintenance, and remote monitoring services for utility-scale battery energy storage systems
Founded in 2022, CES has stated to have commissioned more than 15 GWh of battery storage systems and services over 1 GW of solar and 4.5 GWh of battery assets.
The acquisition is expected to create an integrated model that accelerates FlexGen’s project delivery, enhances system performance, and strengthens long-term asset reliability for customers.
FlexGen also states that its software-focused, OEM partner program will now include CES’s authorized service provider capabilities. In addition, CES’s solar servicing expertise enhances the FlexGen HybridOS Solar PPC offering, enabling more comprehensive support for solar and hybrid assets.
“Demand for reliable, high-performance power is accelerating, and customers need partners who can deliver at scale,” said Kelcy Pegler, CEO of FlexGen. “The addition of CES strengthens our service platform and reinforces our leadership in energy storage technology. By pairing best-in-class lifecycle services with HybridOS and Solar PPC, FlexGen is positioned to deploy faster, operate better, and deliver sustained value for our customers.”
CES is said to continue its operation in its remote operations center in Houston, Texas, for over 1GW of solar and 4.5 GWh of batteries, while FlexGen will maintain its ROC in Durham, aiming to provide 24/7 monitoring, root-cause analysis, and field service dispatch.
In January 2025, FlexGen secured a $75 million revolving credit facility. J.P. Morgan acted as the lead arranger and administrative agent for the funding, along with commitments from Banco Santander, BNP Paribas, and First National Bank of Pennsylvania.
According to Mercom’s Annual and Q4 2025 Funding and M&A for Energy Storage report, the corporate M&A activity decreased, with 22 companies acquired in 2025 compared to 25 in 2024.
In September 2025, I Squared Capital, an infrastructure investment manager, entered into a definitive agreement to acquire a majority equity interest in ENTEK Technology Holdings, a manufacturer of battery separators.
