A grid-scale battery energy storage project in Pecos County, Texas continues progressing toward its targeted mid-2026 completion, reinforcing the region’s role in supporting renewable integration and grid stability within the ERCOT market.

The 430 MWh facility, developed under Longfellow BESS I LLC, reflects sustained investment in large-scale storage infrastructure designed to store excess renewable energy and dispatch it during peak demand periods, while improving reliability and affordability across the Texas power network.

Current Status and Project Overview of Texas Grid-Scale Battery Storage Project

The project involves the development of a 430 MWh Battery Energy Storage System (BESS) connected to the ERCOT grid. Moreover, the system will store surplus renewable energy and release it during peak demand periods.

SolarMax Technology, Inc., through its subsidiary, leads full EPC delivery for the project. Additionally, the EPC scope includes engineering, procurement, installation, testing, commissioning, and grid interconnection. The contract value stands at approximately $127.3 million, reflecting a significant utility-scale investment.

The project remains under development as it approaches its mid-2026 completion target. So far, no delays or cancellations have been publicly reported, indicating steady execution progress.

Supplier negotiations had reached advanced stages at the time of the initial announcement. Meanwhile, construction activities continue aligning with the planned commissioning timeline.

Market Context and Strategic Expansion of Texas Grid-Scale Battery Storage Project

Texas continues attracting major battery storage investments due to its growing renewable energy capacity. Consequently, developers increasingly deploy BESS projects to stabilize intermittent solar and wind generation.

Meanwhile, similar investments continue shaping the Texas energy storage landscape as developers scale capacity across the ERCOT grid. In particular, a recently awarded Texas Battery Energy Storage System contract involving Bimergen and TruGrid highlights continued momentum in deploying mid-sized storage assets that complement large-scale projects like this Pecos County development. These parallel developments collectively strengthen grid resilience while accelerating renewable energy integration across Texas.

SolarMax Expands into Utility-Scale Storage

Scheduled for completion by June 30, 2026, the project is designed to store renewable energy and dispatch it during peak demand periods helping improve grid stability and energy affordability in the ERCOT market.

SolarMax will handle the full EPC scope, including design, procurement, installation, and commissioning. The company is also taking an 8% equity stake in Longfellow BESS I LLC, the special-purpose entity developing the project.

The Solamax BESS project in Texas positions the company competitively in the fast-growing U.S. energy storage sector, where utility-scale battery systems are becoming vital for renewable energy integration.

Also read: EDF Sells Beehive Battery Energy Storage BESS Project in Arizona to CIP

CEO: A Shift Toward Long-Term Clean Energy Growth

CEO David Hsu said the contract signals a strategic pivot as SolarMax evolves into a full-service clean energy solutions provider.

“The Solamax BESS project in Texas demonstrates our capacity to execute complex, high-impact projects that support the nation’s clean energy transition,” said Hsu. He added that supplier negotiations are nearly complete, and the company is on track to deliver the project by mid-2026.

Also read;All about the Ables Springs solar + storage Project, Texas

Project Fact Sheet

Project Name: Pecos County Battery Energy Storage System (Solamax BESS)

Location: Pecos County, Texas, USA

Capacity: 430 MWh

Power Output: Not publicly disclosed

Project Type: Utility-scale Battery Energy Storage System (BESS)

Contract Value: $127.3 million

Grid Connection: ERCOT

Scope: Full EPC including design, procurement, construction, testing, commissioning, and interconnection

Developer / Owner: Longfellow BESS I LLC

EPC Contractor: SolarMax Technology, Inc. (via SolarMax Renewable Energy Provider, Inc.)

Equity Participation: SolarMax holds an 8% stake

Construction Status: Under development

Expected Completion: June 2026

Project Team

Owner / Developer: Longfellow BESS I LLC

EPC Contractor

• SolarMax Technology, Inc.
• SolarMax Renewable Energy Provider, Inc. (subsidiary delivering EPC scope)

Partners: SolarMax Technology, Inc. (also equity partner with 8% stake)

Sponsors / Investors

• Longfellow BESS I LLC (project sponsor and special-purpose vehicle)
• Equity participation from SolarMax Technology, Inc.

Engineering, Procurement and Construction Scope

• SolarMax Renewable Energy Provider, Inc. (full EPC delivery including interconnection works)

Grid Operator: ERCOT (Electric Reliability Council of Texas)