Pasadena Grounded New Battery Energy Storage System

City leaders have launched construction on a 25-megawatt battery facility at the Glenarm power plant site.

Updated on Oct. 9, 2026 in Electric Vehicles

Pasadena Grounded New Battery Energy Storage System

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Pasadena officials held a groundbreaking ceremony for the new Glenarm Battery Energy Storage System. The project received $9.66 million in funding from the California Energy Commission to enhance power grid resilience.

Why it matters

This infrastructure investment supports the city goal of achieving 100% carbon-free energy generation. By storing energy for use during peak hours, the facility aims to strengthen grid reliability for residents.

The new facility features a 25-megawatt capacity with four-hour energy storage duration. It utilizes lithium iron phosphate battery technology to provide carbon-free energy discharge.

The players

Pasadena City Council

The legislative body for the city of Pasadena that authorized the battery project partnership.

California Energy Commission

The primary state agency responsible for energy policy and funding for clean energy infrastructure projects.

Glenarm BESS, LLC

The private firm partnering with the city on the design and future purchase of the battery energy storage system.

The details

The project is a partnership between Pasadena and Glenarm BESS, LLC, which was formally approved by the City Council in 2024. The facility will store electricity for discharge during evening peak hours to balance power demand.

Pasadena City Council approved the project partnership in 2024.
Leaders held the official groundbreaking ceremony on October 8, 2026.
Construction is expected to reach completion by mid-2027.

Roadmap

This project reflects the broader shift in the automotive and energy sectors toward decentralized grid storage solutions. It positions Pasadena as an early adopter of utility-scale battery technology as cities move away from traditional base-load generation.

Residents can expect improved grid reliability and progress toward local carbon-free energy goals once the system is online. The initiative serves as a core component of the city strategy to manage energy costs during high-demand evening hours.

The takeaway

Large-scale battery storage represents a critical bridge for cities attempting to integrate more renewable energy into their existing electrical grids. Implementing these systems allows municipalities to store excess power for use during the times when residents need it most.