Frontier Power USA (FPUSA) has announced the selection of Bimergen Energy’s Wildfire battery energy storage system (BESS) project, a 100MW/400MW-hour (MWh) scheme in Caldwell County, Texas.
Wildfire is set to be converted onto FPUSA’s platform as part of an existing strategic agreement between the two companies.
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This planned battery system is expected to make use of Eos Energy’s Z3 long-duration batteries.
The completion of the transaction will depend on the finalisation of formal documentation and the closing of a rights offering currently being conducted by Eos Energy.
The choice of the Wildfire BESS follows FPUSA’s recent conversion of a 480MWh portfolio of ERCOT-based projects from Bimergen and the identification of four projects totalling around 920MWh under a strategic partnership with Stella Energy Solutions.
Jointly, the closed and selected projects now stand at approximately 1.8GW-hours (GWh), equivalent to 90% of FPUSA’s 2GWh capacity reservation agreement with Eos.
According to the companies, the economics for the Wildfire agreement are expected to match those of a previous Bimergen transaction.
The current portfolio of projects targets near-term construction readiness milestones in 2026 and early 2027. This focus aligns with FPUSA’s strategy to advance late-stage projects towards construction on an accelerated basis.
The company’s 2GWh reservation with Eos was designed to ensure dedicated access to US-made, long-duration battery systems and support consistent project execution.
So far, the partnership has included the conversion of the initial Bimergen ERCOT portfolio, which comprised two ‘Texas 10’ projects and the Redbird project (a total of 480MWh). It also includes the selection of Stella’s four projects (approximately 230MW/920MWh) and now, the Wildfire BESS Project.
Equity funding for FPUSA is supported by Cerberus Capital Management, with further investment from Hudson Bay Capital and proceeds from the Eos rights offering.
Hudson Bay has made a $50m direct equity commitment to FPUSA, as part of a wider $125m package that also includes investment in Eos.
In addition, KKR Capital Markets has been engaged to work on the structuring of long-term project finance solutions for the platform.
Bimergen Energy co-CEO Cole Johnson said: “This is our second transaction under the framework with FPUSA, and it shows how the model is designed to work: Bimergen originates and develops late-stage projects, and the platform converts them into construction-ready assets with committed American-made battery supply and institutional capital behind them. We look forward to completing documentation and moving Wildfire toward construction.”
