FlexGen launched in 2009 as a microgrid developer for remote locations, gradually shifting toward large-scale BESS applications. The company leveraged expertise from off-grid projects—which required integrating multiple energy technologies and managing weak or unstable grid conditions—to build software-driven solutions for utility-scale storage.
In summer 2025, FlexGen acquired “almost all the assets” of bankrupt rival Powin, which had deployed 11.3GWh of systems since the mid-2010s. According to Drew Leibowitz of consultancy PowerSwitch Advisory, Powin likely struggled because it manufactured BESS using third-party battery cells while competing against Chinese battery OEMs that integrated their own cells at lower cost.
The acquisition included Powin’s hardware and software IP, with FlexGen teams taking over service responsibilities for existing Powin installations to ensure uninterrupted support.
In April 2026, FlexGen acquired Clean Energy Services (CES), a US-based services company that claimed to operate the largest BESS commissioning team in the country. CES had established partnerships with multiple BESS OEM suppliers, giving FlexGen access to those relationships through CES’s authorised service provider (ASP) channels.
