Generation
EIA-923 through Jul 2026The same CAISO plants made 4.1% less power than a year earlier. Wind added 1.7 TWh and gas fell 5.2 TWh. Clean power is 61% of its output, up 10 points since 2019.
How CAISO got here
Share of net generation each yearClean power 51% in 2019, 61% in 2025. Hover a year for its mix.
Fuel by fuel
Share is 2025; Jan–Jul compares the same plantsWho makes CAISO’s power
2025, 180 TWhEach block is a plant. Hover to see it, click to open its page.
Each block is one plant, sized by its 2025 output; the lighter block holds the smaller plants. Pumped storage, which nets negative, is left out.
This year against last
20262025Running total, same plants, each on its own scaleBiggest gains
SunZia Wind South+1.6 TWhfrom zeroDiablo Canyon+735 GWh10.4 TWh → 11.1Bellefield Solar and Ener…+680 GWhfrom zeroSunZia Wind North+453 GWhfrom zeroBiggest drops
Colgate−1.1 TWh1.1 TWh → 0Delta−766 GWh1.8 TWh → 1.1Colusa−674 GWh1.2 TWh → 530Gateway−558 GWh1.4 TWh → 822New this year
16 plants, 6.4 GW, made 3.9 TWh by July.
Battery discharge
GWh a month2026 months are provisional: monthly reporters only. Plants that report once a year appear when the 2026 file is final.
CO₂ intensity
lb per MWh284 lb/MWh in 2025, down 31% since 2020. The seven ISOs together: 767.
EIA-923: 2019–2025 final; Jan–Jul 2026 counts plants that report monthly (about 75% of CAISO’s output last year) and compares them with the same plants in 2025. CO₂ from 2020: EPA CAMPD, or EIA-923 fuel use × EPA emission factors where CAMPD misses a plant or covers it in part. Sources