FlexGen Power Systems, LLC, a battery energy storage system and energy management software provider based in Durham, North Carolina, announced that it will serve as the integrator of MN8 Energy's Mammoth Solar project in Kanawha, West Virginia.

MN8 Energy Combines Solar With Lithium-Ion and Zinc Storage

The project, owned and operated by MN8 Energy, combines 86 MW of utility-scale solar with two distinct storage technologies: 70 MW/280 MWh of lithium-ion storage and 10 MW/100 MWh of Eos Energy Enterprises' Eos Z3 zinc-based storage.

All three components will operate as a single dispatchable resource. The Eos deployment marks the first utility-scale zinc-based long-duration energy storage installation in West Virginia.

HybridOS Software to Coordinate Diverse Storage Technologies

At the core of FlexGen's integration role is its HybridOS energy management software (EMS), which the company says balances control, analytics, and flexibility in system design. According to the announcement, the software is intended to allow the site to fulfill current needs while adapting to future changes.

The pairing of utility-scale solar with both short- and long-duration storage is designed to increase the round-the-clock clean power available to local digital infrastructure. FlexGen describes the Mammoth Solar campus as an example of energy systems that support digital infrastructure both on the grid and behind the meter as a single dispatchable resource.

FlexGen notes that its HybridOS EMS has accumulated more than 13 million hours of runtime on its codebase, which the company says allows the software to evolve as it encounters more edge cases, benefiting other projects through performance and feature optimizations.

Commissioning Approach and Ongoing Support

FlexGen plans to test and validate critical system integrations at its North Carolina lab through its One Touch Commissioning process before hardware ships to the site. The company states that identifying and resolving integration challenges early can streamline field commissioning and reduce project delays.

For complex, multi-faceted projects like Mammoth Solar, FlexGen's Remote Operations Center (ROC) will provide overnight support to keep commissioning activities moving forward even when field teams are off-site.

Executive Commentary

"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."

About the Companies

FlexGen provides software and services for designing, deploying, managing, and optimizing battery energy storage systems. The company cites more than 17 years of expertise in software, engineering, and procurement and says it serves more than 25 GWh across over 200 energy storage systems.

Its HybridOS EMS integrates with a wide range of battery OEMs and offers advanced analytics and AI-driven insights that allow storage owners to deploy diverse power market strategies and integrate various generation sources. FlexGen describes its customer base as including developers, utilities, government agencies, and industrial companies around the world.

Eos Energy Enterprises, whose Eos Z3 zinc-based storage is deployed at the site, trades on the Nasdaq under the ticker EOSE.

FlexGen stated that complex energy sites like the Mammoth Solar campus require storage systems designed, deployed, and managed specifically for multidimensional power needs, and that a sophisticated EMS is especially important for maintaining efficient operations and maximizing uptime.

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