REV Renewables and Northern California Community Choice Aggregators Launch First-Ever Eight-Hour Energy Storage Project in California

Media Contact: Stephanie Martin, Public Affairs Manager, smartin@revrenewables.com

Kern County, CA — June 18, 2026— Today, REV Renewables (REV), an LS Power company and a leading developer, owner, and operator of renewable energy and energy storage projects, marked a major milestone with the commissioning of its Tumbleweed Energy Storage facility in Kern County, California. Celebrated with a ribbon-cutting ceremony alongside local officials, community leaders, and industry partners, the project is the first eight-hour battery energy storage system in California—ushering in a new era of grid reliability and clean energy integration. 

Developed in partnership with Ava Community Energy and California Community Power (CC Power) on behalf of its participating members CleanPowerSF, Peninsula Clean Energy, Redwood Coast Energy Authority, San José Clean Energy, Silicon Valley Clean Energy, Sonoma Clean Power, Valley Clean Energy, all Community Choice Aggregators (CCAs) serving Northern California, the project was brought online ahead of California Public Utilities Commission’s (CPUC) requirements. The early delivery underscores the partners’ shared commitment to accelerating the state’s clean energy transition while enhancing grid resilience. 

The Tumbleweed facility represents a significant shift in how battery storage supports the electric grid. While energy storage projects just five years ago primarily provided ancillary grid services lasting seconds or minutes, the industry has evolved toward four-hour systems capable of delivering energy over extended periods to support grid operations and reliability. At eight hours, Tumbleweed is among the first projects capable of bulk-shifting solar energy generated during the day to power homes and businesses overnight, helping to reduce emissions while strengthening grid reliability. 

 “As the first eight-hour long duration energy storage project developed under the California Public Utilities Commission’s Integrated Resource Plan procurement requirements, Tumbleweed demonstrates how forward-looking policy can most affordably accelerate deployment of the next generation of grid infrastructure,” said Leuwam Tesfai, the CPUC’s Executive Director. “These types of projects will help create a more resilient, reliable, affordable, and carbon-free electric system for California communities.” 

Unlike shorter-duration systems, eight-hour storage further matures the role batteries play on the grid. By extending discharge capability, the system is expected to reliably shift large volumes of renewable energy generated throughout the day, helping further reduce dependence on fossil-fuel generation, lower emissions, and support California’s long-term climate and reliability goals.

 Ava Community Energy and CC Power were instrumental in advancing the project on an accelerated timeline. Both organizations represent CCAs that are deeply rooted in their communities and focused on delivering clean, reliable, and affordable power. Their leadership in bringing this project online ahead of regulatory deadlines highlights the growing role of local 

energy providers in driving innovation. “As a not-for-profit public agency, we’re committed to providing cleaner energy at competitive rates to the communities in Alameda and San Joaquin counties that we serve,” said Howard Chang, CEO of Ava Community Energy. “Long-duration storage projects like Tumbleweed are critical to delivering on that commitment. Our partnership with REV on this eight-hour battery helps us strengthen grid reliability and accelerate California’s clean energy transition.” 

“The Tumbleweed project is a landmark achievement for California’s clean energy transition and the first eight-hour battery energy storage system in CAISO,” said Ed Sondey, Chief Executive Officer of REV Renewables. “It reflects REV’s leadership in developing innovative storage solutions at scale and marks another important milestone as we continue to grow our business and support a more reliable, resilient grid. We are grateful for the partnership and collaboration of Ava Community Energy and CC Power, whose shared commitment and vision were instrumental in bringing this groundbreaking project to fruition.” 

According to Alexander Morris, General Manager of CC Power, “We’re pleased to have partnered with REV Renewables and have been impressed with their successful development of this innovative project. The Tumbleweed long-duration storage project represents CC Power’s first operational resource and serves as an example of the innovative and emerging technology resources that CC Power was formed to procure on behalf of its members. We are excited about this milestone moment for California, what it says about the role of CCAs in proactively advancing the state’s goals for clean, reliable energy, and how joint action through CC Power can be a valuable tool to achieve those goals.” 

As part of the ribbon-cutting celebration, REV Renewables will announce a $5,000 community investment in the Kern County Economic Development Women in STEM Scholarship program and a $2,500 community investment in Rosamond Little League, supporting educational opportunities, youth development, and long-term community vitality in the region. 

The Tumbleweed Energy Storage Facility supports California’s ambitious clean energy and decarbonization goals by enabling greater use of renewable energy resources while enhancing grid reliability during periods of peak demand. 

About REV Renewables

REV Renewables, an LS Power company, is an industry leader in the development, acquisition, and operation of renewable energy and energy storage projects. With a 2.9 GW operating fleet and a substantial development pipeline, REV ranks among the nation’s largest non-utility portfolios of renewables and energy storage. REV is dedicated to meeting America’s growing demand for electricity with resources that are reliable, affordable, and resilient. For more information, please visit www.REVrenewables.com. 

About LS Power

Founded in 1990, LS Power is the premier development, investment, and operating company focused on the North American power and energy infrastructure sector, with leading platforms across generation, transmission, and energy solutions. Since inception, LS Power has developed or acquired 47,000 MW of power generation, including utility-scale solar, wind, hydro, battery energy storage, and natural gas-fired facilities. Additionally, LS Power Grid has built 780+ miles of high-voltage transmission, with 350+ miles and multiple grid infrastructure projects currently under construction or development. LS Power actively invests in and scales businesses that are accelerating the energy transition, including electric vehicle charging, demand response, microgrids, renewable fuels and waste-to-energy platforms. Over the years, LS Power has raised more than $60 million in debt and equity capital to support North American infrastructure. For more information, please visit www.LSPower.com. 

About Ava Community Energy

Ava Community Energy (Ava) is the not-for-profit public power provider for more than 2 million residents and businesses in Alameda County and San Joaquin County. As one of 25 community choice aggregation (CCA) programs operating in California, Ava is part of the movement to provide energy choice while expediting local and state-wide climate action goals.Ava is committed to creating a brighter future in our communities and beyond by providing clean power at competitive rates, reinvesting in our member communities, and developing programs that make it easy for customers to discover and adopt clean energy solutions. To date, Ava has saved customers more than $183 million and contracted for nearly 2.5 gigawatts of renewable energy generation and storage. For more information, visit AvaEnergy.org.

About CC Power

California Community Power is a joint powers authority comprised of nine California CCAs. CCPower combines its members’ buying power to procure new, large-scale, complex, emerging technology, hard-to-find, or CCA-owned resources to advance local and state climate goals. CCPower members represent approximately 12% of the CAISO’s load across 2.7 million customers and 112 municipalities spanning from Humboldt County to Santa Barbara County in California. For more information, please visit www.CACommunityPower.org.

CC Power Media Contact:

Alexander MorrisGeneral Manager

amorris@cacommunitypower.org

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