FlexGen to Integrate Long-Duration Storage at MN8 Energy's Mammoth Solar Campus

FlexGen will test and validate system integrations at its North Carolina lab before hardware ships to the site.

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FlexGen HybridOS® orchestrates energy storage assets to strengthen the grid surrounding one of West Virginia’s most advanced solar and energy storage projects.

DURHAM, N.C.--(BUSINESS WIRE)-- FlexGen Power Systems, LLC ("FlexGen"), a leading battery energy storage system and energy management software provider, today announced it will serve as the integrator of MN8 Energy’s Mammoth Solar project in Kanawha, West Virginia. Owned and operated by MN8, the project includes 86MW of utility-scale solar, 70MW/280MWh of lithium-ion storage, and 10MW/100MWh of Eos Energy Enterprises’ (NASDAQ: EOSE) Eos Z3™ zinc-based storage operating as a single dispatchable resource.

Mammoth Solar pairs utility-scale solar with short- and long-duration storage to increase the round-the-clock clean power available to local digital infrastructure. As the integrator of the first utility-scale zinc-based LDES deployment in West Virginia, FlexGen will provide HybridOS™ energy management software (EMS) that balances control, analytics, and flexibility in system design, so the site can fulfill current needs while adapting to future changes.

Through FlexGen’s One Touch Commissioning™, critical system integrations will be tested and validated at its North Carolina lab before hardware ships to the site. By identifying and resolving integration challenges early, FlexGen can streamline field commissioning and reduce project delays. For complex, multi-faceted projects like the Mammoth Solar campus, FlexGen’s Remote Operations Center (ROC) provides overnight support to keep commissioning activities moving forward, even when field teams are off-site.

"Projects like Mammoth Solar reflect the growing sophistication of energy systems that support digital infrastructure, both on the grid and behind the meter as a single dispatchable resource for the grid,” said Kelcy Pegler, CEO of FlexGen. “That is where FlexGen thrives. Our roots in microgrids and our utility-scale experience give us the expertise to make diverse energy technologies operate as one coordinated power resource, bringing them online predictably, then maximizing the availability and capacity the grid depends on.”

“Developing innovative energy solutions like Mammoth Solar is what MN8 does best,” said Moe Hanifi, Head of Revenue and Commodities at MN8 Energy. “Partners like FlexGen are key to bringing capable energy infrastructure online to support the growing needs of the grid and digital infrastructure.”

Complex energy sites like the Mammoth Solar campus need energy storage systems that are designed, deployed, and managed specifically for their multidimensional power needs. A sophisticated EMS is especially important for maintaining efficient operations and maximizing valuable uptime. With over 13 million hours of runtime on its codebase, FlexGen HybridOS® EMS continues to evolve as it encounters more edge cases, benefiting other projects that use the software with performance and feature optimizations.

About FlexGen Power Systems, LLC

FlexGen provides software and services for designing, deploying, managing, and optimizing battery energy storage systems. FlexGen leverages more than 17 years of expertise in software, engineering, and procurement to solve today’s toughest energy challenges and enable the transition to a modern electric grid. FlexGen HybridOS® energy management system integrates with a wide range of battery OEMs and offers advanced analytics and AI-driven insights that allow energy storage owners to deploy diverse power market strategies and integrate various generation sources, enhancing grid stability and economic returns. Serving more than 25 GWh and over 200 energy storage systems enabled by FlexGen, we are trusted by some of the most technically and commercially demanding developers, utilities, government agencies, and industrial companies around the world.

View source version on businesswire.com: https://www.businesswire.com/news/home/20261111558600/en/

Media Inquiries: flexgen@ink-co.com

Source: FlexGen Power Systems, LLC

Key Terms

lithium-ion technical

A type of rechargeable battery chemistry that stores and releases energy by moving lithium ions between two electrodes; think of it as a lightweight, refillable fuel tank for electronics and vehicles. It matters to investors because lithium‑ion batteries are central to smartphones, electric vehicles and grid storage, driving demand for raw materials, manufacturers and related supply chains, and influencing costs, growth prospects and regulatory attention.

ldes technical

Long-duration energy storage (LDES) describes technologies that store large amounts of electricity for many hours to days, not just minutes, allowing power to be shifted from times of surplus to times of need. For investors it matters because LDES can unlock greater use of renewable energy, reduce the risk of blackouts, create new revenue streams for utilities and storage companies, and influence long-term capital and policy decisions in the energy sector.