GridStor, a Portland, Oregon-based developer and operator of utility-scale battery energy storage systems, has acquired the Birdseye project in Adams County, Colorado, from Austin-based Accelergen Energy.

The 199 megawatt, 796 megawatt-hour project marks GridStor's fifth acquisition within the last eighteen months and its second project in the Western United States.

Deal Details and Project Scope

The Birdseye project is a standalone battery energy storage facility that GridStor plans to bring into commercial operations by the end of 2028. Construction is anticipated to begin as early as 2027 and is expected to generate approximately 115 full-time jobs during that phase. Once operational, the facility is expected to provide power equivalent to serving more than 150,000 households during daily peak demand hours.

The acquisition adds to GridStor's existing portfolio of 530 megawatts and 1,300 megawatt-hours of battery energy storage assets currently in operation and under construction. The company also manages a pipeline of more than 3 gigawatts of battery storage projects in later-stage development across the western and central United States.

Strategic Rationale for the Western Expansion

GridStor chief executive Chris Taylor described the acquisition as part of a deliberate effort to grow the company's portfolio through targeted purchases of development-stage projects. "We are actively expanding our portfolio by acquiring high-quality projects," Taylor said.

"One of our core strengths is efficiently transitioning projects from the development phase to operational status. We look forward to bringing more battery storage facilities online to support power system reliability for Western utilities."

The company cited rapidly rising energy demand in the Western United States as a key driver of its acquisition strategy in the region. GridStor's stated focus is on delivering cost-effective, near-term solutions to utilities, data centers, and other large industrial customers in areas experiencing significant demand growth.

Accelergen's Perspective on the Transaction

Accelergen Energy, founded in 2020 and headquartered in Austin, Texas, develops greenfield utility-scale battery energy storage systems and hybrid solar storage projects.

The company positions itself as focused on advancing zero-carbon power generation and uses what it describes as an analytics-driven approach to project siting and development.

Thomas Houle, chief executive of Accelergen, framed the deal as a continuation of the project's mission rather than an exit. "Growing regions are reliant on dependable sources of energy to sustain their momentum," Houle said.

"Battery storage provides a stable foundation for economic growth by supporting a reliable grid, and we are pleased to partner with GridStor to see this project through to operations." Accelergen did not disclose the financial terms of the transaction, and no purchase price was included in the announcement.

Goldman Sachs Backing and Company Footprint

GridStor is backed by Goldman Sachs Asset Management, which operates an infrastructure investment platform that has deployed approximately $13 billion in infrastructure assets since its establishment in 2006.

Goldman Sachs Asset Management supervises approximately USD 3.3 trillion in assets globally as of June 30, 2025, with its alternatives business managing more than USD 500 billion across asset classes, including private equity, private credit, real estate, infrastructure, and sustainability-focused investments.

The backing provides GridStor with access to capital as it pursues its stated strategy of acquiring projects in later stages of development and advancing them through construction to commercial operations. The Birdseye acquisition follows a pattern the company has established over the past year and a half, with five acquisitions completed in that window.

Colorado Project Joins a Growing Western Portfolio

Adams County, where the Birdseye project is located, sits in the Denver metropolitan area, a region that has seen sustained population and economic growth in recent years. The project's placement there aligns with GridStor's stated focus on markets where energy demand is expanding and where grid reliability concerns are prominent among utilities.

The Birdseye facility joins a pipeline that GridStor has described as concentrated in the western and central United States. The company's second Western acquisition in eighteen months signals a continued emphasis on that geography as it works to scale its operational base beyond the 530 megawatts it currently manages across projects in operation and construction.

GridStor develops, acquires, builds, and operates utility-scale standalone battery energy storage projects primarily across North America, according to the company.

The Birdseye project, with its four-hour duration at full capacity, fits the profile of large-scale storage assets that utilities and grid operators increasingly rely on to manage periods of peak electricity demand.

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