California Solar Power Overtakes Natural Gas As Grid Transformation Accelerates In 2026

California’s electricity sector is witnessing a major transformation as solar energy has surpassed natural gas as a primary source of power generation within the state’s main electric grid. According to data from the California Independent System Operator (CAISO), utility-scale solar power generated more electricity than natural gas during the first five months of 2026, marking a significant milestone in the state’s clean energy transition.

Solar generation increased by 21% compared to the same period in 2024, while electricity production from natural gas dropped sharply by 60%. The change was not limited to a few high-production days. Solar power outperformed natural gas on 82% of days during the first five months of 2026, compared to only 21% of days in 2024 and 2025.

A major factor behind this shift has been the rapid expansion of renewable energy infrastructure. While natural gas generation capacity remained unchanged at 29 GW over the past two years, utility-scale solar capacity grew by 19% to reach 25 GW between April 2024 and April 2026. At the same time, battery energy storage capacity expanded by 79%, reaching 16 GW. Overall, CAISO’s total grid capacity increased by 14%, adding around 11 GW of new resources.

Battery storage has become an essential part of California’s energy system. Batteries store excess solar power generated during the middle of the day and release it during evening and early morning periods when electricity demand remains high but solar production is lower. As a result, battery discharge into the grid during the first five months of 2026 was three times higher than in the corresponding period of 2024.

Despite a 7% rise in local electricity demand, total net generation within the CAISO grid fell by 19%. The difference was largely covered through increased electricity imports from neighboring regions. Improved hydropower availability in the Pacific Northwest, following better water conditions, contributed to higher imports. California also began receiving electricity from the SunZia wind project in New Mexico from April 2026 onward.

The grid experienced some retirements, including a 300 MW battery facility that was taken offline after a fire in January 2025. Nevertheless, growing solar installations, expanded battery storage, and affordable imported electricity have helped California accelerate its transition toward a cleaner and more diversified energy mix.