FlexGen Acquires Clean Energy Services (CES), Strengthening Battery Leadership and Improving System Reliability with Expanded Service Offerings

With this transaction, FlexGen will accelerate deployment of battery systems, expand service offerings to improve system reliability, and broaden both its customer base and addressable market, including utilities, independent power producers (IPPs), and the rapidly growing data center segment.

• Adding CES’s commissioning and lifecycle service teams will enable faster project delivery and maintain high system availability for the life of the asset.
• FlexGen’s software-focused, OEM partner program will now include CES’s authorized service provider (ASP) capabilities.
• CES services over 1GW of solar sites and over 4.5GWh of battery sites and has commissioned over 15 GWh of battery sites, making it the industry leader in battery storage commissioning and services.

DURHAM, N.C.--(BUSINESS WIRE)--FlexGen Power Systems, LLC ("FlexGen"), a leading provider of battery energy storage software and services, today announced it has acquired Clean Energy Services CES LLC (“CES”), a leading provider of battery energy storage system (BESS) and utility-scale solar (PV) services.

The acquisition will create an integrated model that accelerates FlexGen’s project delivery, enhances system performance, and strengthens long-term asset reliability for customers. It will support industry-leading system availability by adding CES’s commissioning and lifecycle service teams, while expanding FlexGen’s OEM partner program to include CES’s authorized service provider (ASP) capabilities, complementing the existing software-focused OEM relationships. 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.”

Co-founded in 2022 by Ahmad Atwan and Constantine Triantafyllides, CES will now operate as CES, a subsidiary of FlexGen. All existing CES customers will continue to receive services from CES without disruption or change. In addition, existing CES customers will have the opportunity to leverage FlexGen HybridOS®, the energy management system (EMS) with controls, analytics, and data access in a single platform, serving as the brain of the battery.

“Strong execution in the field is critical to minimizing downtime and maximizing long-term system performance,” said Ahmad Atwan, CEO of CES. “CES has achieved a market leadership position in battery storage services by focusing on reliable speed of service delivery and optimizing asset performance. FlexGen and CES have been strong partners for years, and this transaction enables us to deliver more robust solutions across a complementary set of customers and markets.”

CES will continue to operate its remote operations center (ROC) in Houston, Texas, for over 1GW of solar and 4.5GWh of batteries, while FlexGen will maintain its ROC in Durham, providing 24/7 monitoring, root-cause analysis, and field service dispatch.

FlexGen brings over 15 years of integration experience and consistently delivers industry-leading 98% system availability.

For more information about FlexGen and this transition, visit: https://www.flexgen.com.

If you’re an existing CES customer with questions, please reach out to: [e-mail]

About FlexGen Power Systems, LLC. FlexGen provides industry-leading software and services for deploying, managing and optimizing battery energy storage systems. FlexGen leverages decades of software, engineering, and procurement expertise to solve today’s toughest energy challenges that enable the transition to a modern electric grid. FlexGen HybridOS® energy management software seamlessly integrates with any battery OEM and offers advanced analytics and AI-driven insights that allow energy storage owners to deploy diverse power market strategies and integrate various generation forms, enhancing grid stability and economic returns. Serving more than 25 GWh and over 200 energy storage systems enabled by FlexGen, we are trusted by the most technically and commercially demanding developers, utilities, government agencies, and industrial companies in the world.

About Clean Energy Services CES LLC. Clean Energy Services (CES) is the leading provider of commissioning, preventative and corrective maintenance, and remote monitoring services for utility-scale battery energy storage systems (BESS). CES is also a leading provider of full lifecycle services for solar (PV) assets. CES supports the full project lifecycle—from pre-commissioning and system integration through long-term operations and maintenance—helping customers maximize asset performance, availability, and safety. With a national footprint, over 125 field technicians and engineers, and deep expertise across all major OEM platforms, CES has commissioned more than 15 GWh of battery storage systems and services over 1 GW of solar and 4.5 GWh of battery assets. CES is trusted by leading developers, utilities, integrators and OEMs to deliver high-quality execution in the field, backed by a strong safety culture and a relentless focus on operational excellence.