Fullmark Energy’s 20MW/40MWh California BESS reaches commercial operation

August 25, 2025
LinkedIn
Twitter
Reddit
Facebook
Email

Independent power producer (IPP) Fullmark Energy has announced the commercial operation of its 20MW/40MWh Ortega energy storage project in Lake Elsinore, California, US.

Fullmark’s battery energy storage system (BESS) is part of its Redwood energy storage portfolio.

Redwood comprises four BESS projects across California. Johanna is a 20MW/80MWh BESS in Santa Ana, Carris-Desert is a 20MW BESS in Palm Springs, and San Jacinto is a 65MW BESS in Banning.

Fullmark emphasised that the portfolio approach for the projects allowed the company to secure consolidated financing, optimise capital efficiency, and generate greater overall value for investors and stakeholders.

This article requires Premium SubscriptionBasic (FREE) Subscription

Enjoy 12 months of exclusive analysis

Not ready to commit yet?
  • Regular insight and analysis of the industry’s biggest developments
  • In-depth interviews with the industry’s leading figures
  • Annual digital subscription to the PV Tech Power journal
  • Discounts on Solar Media’s portfolio of events, in-person and virtual

Or continue reading this article for free

Johanna was the first to go into commercial operation in 2021. Ortega is the third operational project in the portfolio. San Jacinto has not yet reached commercial operation status.

Fullmark stated that Ortega faced complex challenges, including designing a complex interconnection system that met landowner needs and developing a sensitive wetland conservation approach that complied with California Department of Fish and Wildlife standards.

Ortega also brought upgraded water lines for neighbouring businesses and beautification of a “previously neglected” site.

The project will participate in the California Independent System Operator (CAISO) market, providing critical grid services including energy arbitrage, frequency regulation, and resource adequacy.

Fullmark’s operational approach focuses on long-term asset management and performance optimisation, using its proprietary Medea dispatch platform across all operating projects. The company says the technology allows for “minute-by-minute optimisation, ensuring safe and reliable operations.”

Fullmark, a spinout of Hecate Energy and InfraRed Capital Partners, previously operated under the name Hecate Grid. The company rebranded to Fullmark earlier this year.

At the time, the company said the rebrand reflected “the company’s evolution from an organisation focused primarily on project development to a fully integrated energy storage company that develops, finances, builds, owns, and operates standalone BESS projects across the US.”

Fullmark has a 4GW development pipeline across several US markets, including California, Texas and the Mid-Atlantic region.

11 November 2025
San Diego, USA
The 2024 Summit included innovative new features including a ‘Crash Course in Battery Asset Management’, Ask-Me-Anything formats and debate-style sessions. You can expect to meet and network with all the key industry players again in 2025 from major US asset owners, operators, RTOs and ISOs, optimizers, software and analytics providers, technical consultancies, O&M technology providers and more.
24 February 2026
InterContinental London - The O2, London, UK
This isn’t just another summit – it’s our biggest and most exhilarating Summit yet! Picture this: immersive workshop spaces where ideas come to life, dedicated industry working groups igniting innovation, live podcasts sparking lively discussions, hard-hitting keynotes that will leave you inspired, and an abundance of networking opportunities that will take your connections to new heights!

Read Next

October 24, 2025
Energy Vault has acquired a 150MW battery energy storage system (BESS) in Texas. Meanwhile, Jupiter Power has entered an agreement with Austin Energy to provide 100MW of electricity from a BESS facility.
October 24, 2025
Redwood Materials has closed a US$350 million Series E funding round to scale up its critical battery materials and energy storage businesses.
Premium
October 24, 2025
San Diego Gas & Electric (SDG&E) is seeking regulatory approval to acquire an operational portion of a BESS facility located in Imperial County, California, from the US development arm of German multinational energy company RWE. 
Premium
October 24, 2025
New company Lunas Energy has launched an offer for solar PV plant operators in Spain to deploy BESS on their land, as the sector struggles with curtailment and negative pricing.
October 24, 2025
Peregrine Energy Solutions has secured US$130 million from investors including the South Korean Ministry of Environment.

Most Popular

Email Newsletter