California has expanded its utility-scale clean energy capacity by more than 39,000 megawatts since 2019, according to the office of Governor Gavin Newsom. This build-out is part of a broader strategy to maintain grid reliability as the state transitions toward a carbon-free electricity system. As of late 2024, 67% of retail electricity sales in California were generated from clean energy sources, with the state meeting 100% of its electricity demand with clean energy for at least part of the day on 279 separate days last year.
Battery Storage Deployment Surges
The state’s reliance on battery storage has grown significantly to balance the intermittent nature of solar power. Since 2019, battery resources serving the California grid have expanded from fewer than 700 megawatts to more than 23,000 megawatts—an increase of over 3,100%. By storing solar energy when it is abundant and deploying it after sunset, the state has reduced its dependence on natural gas plants, according to state data. This transition is supported by a workforce of 552,300 clean energy employees, a figure that leads the nation and grew by nearly 7,300 workers in 2024.
Coordinated Agency Planning
To manage the integration of new energy resources, three major California agencies—the California Independent System Operator (CAISO), the California Public Utilities Commission (CPUC), and the California Energy Commission (CEC)—signed a memorandum of understanding in December 2022. This agreement linked resource planning, transmission development, and procurement to ensure grid reliability. The Newsom administration also established the Strategic Reliability Reserve in 2022 to provide a backstop of energy resources during periods of extreme heat or supply chain disruptions.
New Legislation for Data Center Demands
In September 2024, Governor Newsom signed a package of laws aimed at managing the rising electricity and water demand from data centers. The legislation mandates that data centers disclose water usage and supply plans to local governments and ensures that these facilities cover the costs of grid upgrades. By requiring data centers to pay their fair share, the state aims to prevent cost shifts to residential ratepayers. These projects are no longer eligible for blanket environmental exemptions, requiring them to demonstrate compliance with state energy and water standards.
Transition Away from Coal
California’s shift to clean energy culminated in 2024 with the retirement of the final coal-fired power plant supplying Los Angeles. This move marks the end of the state’s reliance on coal-fired electricity. While federal actions in other regions have occasionally forced coal plants to remain operational past their planned retirement dates, California continues to prioritize the deployment of storage and clean energy resources to maintain power stability.
Frequently Asked Questions
How does California ensure the grid can handle high demand from data centers?
Under the 2024 legislative package, data centers are required to pay for necessary grid upgrades and comply with state energy procurement requirements. This ensures that the costs of infrastructure expansion are borne by the industry rather than being shifted to utility customers.
What role does the Strategic Reliability Reserve play?
Created in 2022, the reserve acts as a safety net during climate-related emergencies or supply chain delays. It maintains backup power resources to prevent blackouts when extreme heat or other conditions create unexpected pressure on the electrical grid.
How is the state tracking its transition to clean energy?