In another sign of progress toward a carbon-free power grid, the California Independent System Operator (ISO) set a new record on April 3, when 97.6% of electricity on the grid came from clean, renewable energy.
The peak, which occurred briefly at 3:39 p.m., broke the previous record of 96.4% set on March 27, 2022. Before that, the grid’s record for clean power was 94.5%, set on April 21, 2021. The new milestone comes as the ISO integrates growing amounts of renewable energy onto the grid in support of the state’s clean energy goals.
“This new record is testament to the hard work and collaboration of many people, from policymakers to system operators,” said Elliot Mainzer, president and CEO, ISO. “While these all-time highs are for a brief time, they solidly demonstrate the advances being made to reliably achieve California’s clean energy goals.”
Ashutosh Bhagwat, chair of the ISO Board of Governors, said the new record is a tribute to California’s ambitious policy goals on climate and clean energy.
“When we see renewable energy peaks like this, we are getting to re-imagine what the grid will look like for generations to come,” he said. “These moments help crystallize the vision of the modern, efficient and sustainable grid of the future.”
The grid also set a historical solar peak of 13,628 MW just after noon on April 8, and an all-time wind peak of 6265 MW just before 3 p.m. on March 4.
Renewable peaks typically occur in the spring, due to mild temperatures and the sun angle allowing for an extended window of strong solar production. ISO analysis forecasts a potential for more renewable records in April.
The ISO has collaborated extensively with the California Public Utilities Commission (CPUC), the California Energy Commission (CEC) and a broad group of stakeholders on market and transmission improvements to integrate increasing amounts of renewable energy. More than 15,000 MW of grid-connected solar power capacity and almost 8,000 MW of wind are now online.
With California committed to a carbon-free power system by 2045, more solar and wind are expected, along with dramatic growth in storage capacity on the system. Another 600 MW of solar and 200 MW of wind are projected to be added to the grid by June 1 of this year. The system currently has more than 2700 MW of storage, most of it in lithium-ion batteries, and that number is projected to grow to about 4000 MW by June 1.
Storage has been critical to reliability during the transition to renewable energy, as it charges using solar and wind output during the middle of the day, and re-injects it back onto the grid on hot summer evenings when solar production has ended and demand remains high.
To follow the ISO’s energy peaks and historical data by month, see Key Statistics on the News webpage. The document is designed to provide the public easy access to key data about the power grid and wholesale energy market during California’s transition to clean energy.