Long-duration energy storage (LDES) development and investment company Frontier Power USA (FPUSA) has acquired a 480MWh battery energy storage system (BESS) portfolio from developer-operator Bimergen Energy.
Announced 21 May, the portfolio is made up of three BESS projects located in Texas, US. One project is a 100MW/400MWh BESS with notices-to-proceed (NTP) expected to begin mid-2026.
FPUSA notes that two of the projects are “Texas 10’s”. It is common for developers in Texas to build 10MW projects, as projects 10MW and under are able to bypass part of the interconnection process with the Electric Reliability Council of Texas (ERCOT).
Subject to certain closing conditions, FPUSA says the transaction will also represent the first acquisition completed with respect to its “exclusive” project pipeline and will mark the initial deployment under FPUSA’s previously announced 2GWh capacity reservation agreement with zinc hybrid cathode battery and storage system maker Eos Energy Enterprises, Inc (Eos).
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In Eos’ recently released Q1 2026 financial results, the company highlighted its formation of FPUSA with investor Cerberus Capital Management. The company announced on 13 May that it and Cerberus intend to capitalise FPUSA.
The projects will specifically use Eos’ Z3 zinc LDES battery technology. FPUSA will have dedicated access to manufacturing capacity to support deployment.
According to FPUSA, under the terms of the transaction agreement, following the acquisition of the three BESS projects, an affiliate of FPUSA will fund 100% of the equity required for construction, pay Bimergen a development fee and fund transaction expenses.
Following FPUSA’s initial capitalisation, its affiliate is expected to transfer the project companies to FPUSA. After this transfer, FPUSA will hold a 92.5% ownership stake in the project companies, while Bimergen retains a 7.5% economic interest in recognition of its ownership and development contributions.
To support project financing, FPUSA says it will implement its technology performance insurance (TPI) framework arranged with technology performance insurer Ariel Green. This structure is intended to enhance bankability and provide access to long-term institutional capital throughout construction and operations.
Frontier Power is also active in the UK, where it announced a partnership with Eos to deploy up to 5GWh of zinc hybrid cathode battery storage in April 2025. With the UK regulator Ofgem’s new cap and floor revenue underwriting scheme for long-duration energy storage as its initial area of interest in that market, Frontier Power has also partnered with Anglo-American vanadium redox flow battery company Invinity. Frontier Power reserved up to 2GWh of Invinity VRFB systems for bidding projects into the LDES support scheme’s solicitations, in an agreement announced in February of last year.
