Nuclear electricity generation typically provides a consistent supply of electricity across the day. Quarterly Fuel Energy Report (QFER) Data supplied to the Energy Commission show nuclear facilities declining generation over the past 20 years primarily due to the closure of the San Onofre Nuclear Generation Station (SONGS). The last full year SONGS, one of two nuclear power plants in California, operated was 2011. Diablo Canyon Power Plant is still operating and has a license extension to operate through late 2030.

Imports of nuclear generated electricity have slowly increased over the past 20 years. As California moves towards a 100 percent clean energy goal, these imports may remain relatively constant.

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Other Dashboards in this Collection:
Estimated Annual Clean Energy | Large Hydroelectric Trends | Nuclear Trends

Generation (GWh):
The annual amount of electricity generated in gigawatt hours.

Gigawatt hour is an electric unit of measurement equal to one million watts of power supplied to, or taken from, an electric circuit steadily for one hour.

Power Source Disclosure (PSD):
The PSD Power Source Disclosure program was established by Senate Bill (SB) 1305 (Stats. 1997, ch. 796) in an effort to provide retail electricity consumers “accurate, reliable, and simple to understand information on the sources of energy that are used to provide electric services.” This program provides consumers a detailed view into the sources of energy purchased and associated greenhouse gas emissions by their retail suppliers to power their homes and businesses.

Quarterly Fuels and Energy Report (QFER):
The set of data collection regulations that collect California electric generation, control area exchanges, and natural gas processing and deliveries. Electricity generation data is collected for power plants with nameplate capacities greater than 1MW located within California or within a control area with California end users.

The quantity of nuclear generation produced for California from 2002 to 2022 are shown.

Trend lines are presented  from 2004 to 2022 and shows the three-year floating average value.

Data last updated: 5/9/2024

Data Collection Information
Source of data was collected from Energy Commission data submittals including QFER, RPS, and PSD data sources and external data sources.

Please cite use of these data and images. California Energy Commission 2023. California Energy Commission Nuclear Trends. Data last updated [insert date last updated]. Retrieved [insert date retrieved] from


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