FlexGen Acquires Clean Energy Services to Strengthen Battery Leadership and Reliability
FlexGen Power Systems, a leading provider of battery energy storage software and integration services, has announced the acquisition of Clean Energy Services CES LLC (CES), a prominent provider of battery energy storage system (BESS) and utility-scale solar service solutions. The strategic move marks a significant step in FlexGen’s long-term growth strategy as it expands its capabilities across the energy storage value chain while reinforcing its position as a technology leader in grid-scale energy storage.
The acquisition will enable FlexGen to integrate advanced energy management software with field-based lifecycle services, creating a more comprehensive platform for energy storage and renewable asset owners. By combining FlexGen’s expertise in software and system integration with CES’s operational and maintenance services, the two companies aim to deliver faster project execution, improved system performance, and stronger long-term reliability for customers.
Energy storage has become a critical component of modern electricity systems, particularly as utilities and energy developers continue to integrate larger amounts of renewable generation. As solar and wind deployment increases globally, grid operators increasingly rely on battery energy storage systems to maintain reliability, balance supply and demand, and ensure the smooth operation of electricity networks. With this acquisition, FlexGen seeks to address growing industry demand for fully integrated solutions that cover the entire lifecycle of energy storage assets—from design and commissioning to operations, maintenance, and optimization.
The addition of CES significantly strengthens FlexGen’s service capabilities by bringing specialized teams focused on commissioning, lifecycle management, and operational support. These capabilities are expected to enhance system availability across FlexGen’s growing portfolio of battery projects. The acquisition also expands FlexGen’s original equipment manufacturer (OEM) partner program by incorporating CES’s authorized service provider (ASP) capabilities. This complements the company’s existing relationships with battery manufacturers and equipment suppliers, allowing FlexGen to deliver both software-driven optimization and hands-on technical services in the field.
Another important benefit of the acquisition is the enhancement of FlexGen’s solar and hybrid asset management capabilities. CES has developed strong expertise in servicing utility-scale solar facilities, and this experience will be integrated into FlexGen’s HybridOS® Solar Power Plant Controller (PPC) platform. By combining solar servicing knowledge with advanced software controls, FlexGen will be able to provide broader support for solar-plus-storage and hybrid renewable projects.
FlexGen’s leadership believes the combined platform will help project developers and asset owners manage increasingly complex energy infrastructure more effectively. As renewable portfolios grow larger and more sophisticated, operators require solutions that not only deliver power reliably but also provide deep insights into performance, predictive maintenance, and system optimization.
“Demand for reliable, high-performance power is accelerating, and customers need partners who can deliver at scale,” said Kelcy Pegler, Chief Executive Officer 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.”
Pegler emphasized that the transaction aligns with FlexGen’s broader mission of helping energy companies deploy flexible, reliable, and efficient energy storage systems. The company has spent more than a decade developing advanced control software designed to manage the complex interactions between batteries, power conversion systems, and the electric grid. By integrating CES’s field services into its offering, FlexGen will now be able to provide end-to-end support that spans the entire operational life of energy assets.
Clean Energy Services was co-founded in 2022 by Ahmad Atwan and Constantine Triantafyllides, both experienced leaders in the renewable energy and battery storage sectors. Since its founding, CES has quickly built a reputation for delivering high-quality commissioning and operational services for battery storage systems and solar installations across the United States.
Following the acquisition, CES will continue operating as CES, a subsidiary of FlexGen, ensuring continuity for existing clients and partners. All CES customers will continue to receive the same services and support without disruption or operational changes. Maintaining this continuity is an important part of the integration strategy, as both companies aim to preserve the trusted relationships CES has built with its customers while introducing new capabilities through FlexGen’s technology platform.
In addition to maintaining service continuity, CES clients will gain access to FlexGen’s flagship software platform, HybridOS®. The platform functions as an advanced energy management system that integrates controls, analytics, and operational data into a single interface. By acting as the “brain” of a battery storage system, HybridOS® allows operators to monitor asset performance in real time, detect anomalies, and optimize dispatch strategies based on market conditions and grid requirements.
According to Atwan, field execution remains one of the most important factors in determining the success of battery storage deployments. “Strong execution in the field is critical to minimizing downtime and maximizing long-term system performance,” he said. “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.”
The integration of CES also enhances FlexGen’s operational infrastructure. CES will continue to operate its remote operations center (ROC) in Houston, Texas, which currently oversees more than one gigawatt of solar capacity and approximately 4.5 gigawatt-hours of battery storage. These facilities provide monitoring, diagnostics, and operational support for a wide range of renewable and storage assets.
At the same time, FlexGen will maintain its existing remote operations center in Durham, North Carolina. Together, the two operations centers will provide comprehensive, around-the-clock monitoring services, including root-cause analysis, system diagnostics, and field service dispatch. This dual-center approach is designed to enhance response times and improve overall asset reliability.
The combined capabilities of the two organizations will help asset owners address some of the most pressing challenges facing the energy storage industry today. As battery storage deployments grow rapidly worldwide, operators must manage increasingly complex systems while ensuring high reliability and long operational lifetimes. Integrated platforms that combine software intelligence with experienced service teams are becoming essential to achieving these goals.
FlexGen brings more than 15 years of experience in integrating energy storage systems for utilities, independent power producers, and energy developers. Over that time, the company has built a strong reputation for delivering reliable, high-performance solutions that help stabilize power grids and support renewable integration. Its systems consistently achieve industry-leading availability rates, with many installations maintaining around 98 percent operational uptime.
The acquisition of CES represents the next phase in FlexGen’s evolution as it continues expanding its capabilities across the energy storage ecosystem. By merging advanced software technology with lifecycle services and operational expertise, the company aims to provide a more unified solution for managing renewable and storage assets.
As the global transition toward cleaner energy accelerates, demand for energy storage solutions is expected to rise dramatically. Grid operators, utilities, and renewable developers are increasingly looking for partners capable of delivering reliable technology, efficient operations, and long-term asset performance. Through this acquisition, FlexGen and CES are positioning themselves to meet that demand while helping build the resilient, flexible energy systems required for the future.
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