Monthly average price
- Real-time
- Day-ahead
USD/MWh, mean of each month’s complete hours at the hub.
CAISO hourly prices through August 2026.
California ISO
CAISO power prices
Hub prices, negative-price hours and the plant fleet, 2025 and 2026 to August.
- SP15 Hub real-time, 2025
- $31.19 /MWh
- SP15 Hub day-ahead, 2025
- $32.22 /MWh
- SP15 Hub real-time, 2026 to Aug
- $25.16 /MWh
- Negative real-time hours at plant nodes, 2025
- 9.3%
CAISO hourly prices through August 2026 · EIA-860M August 2026 · Updated 2026-10-27
Hub prices
3 hubs, January 2025 to August 2026.
Hours with negative real-time prices
- Plant nodes1,256 nodes
- SP15 Hub
Negative node-hours over valid node-hours, real-time.
Real-time prices at 1,256 pricing nodes linked to plants. Node names are part of Pro.
| Hub | 2025 real-time | 2025 day-ahead | 2026 to Aug real-time | 2026 to Aug day-ahead | Negative hours, 2025 |
|---|---|---|---|---|---|
| NP15 Hub | $37.26 | $38.23 | $27.39 | $27.98 | 4.7% |
| SP15 Hub | $31.19 | $32.22 | $25.16 | $24.79 | 11.0% |
| ZP26 Hub | $31.72 | $32.50 | $23.45 | $24.49 | 10.6% |
Plant fleet
- Operating plants
- 1,617
- Nameplate
- 98 GW
- Plants with hourly node prices
- 876 of 1,617
- States
- 4
Nameplate by fuel
- Natural gas32 GW32%
- Solar26 GW26%
- Battery storage17 GW17%
- Wind10.0 GW10%
- Hydro8.5 GW8%
- Other5.2 GW5%
- Nuclear2.3 GW2%
- Coal0.1 GW0%
EIA-860M August 2026, operating projects by ISO region.Open the map
Largest plants
Nameplate, all generators and batteries.Plants by state
Nameplate by state
States with 1% or more of the market’s nameplate.
Curtailment
Wind and solar curtailed each year
3.66 TWhin 2025, 4.4% of the wind and solar energy available, from 0.19 TWh in 2015
Reported curtailment, TWh per year
CAISO December 2025 Monthly Renewables Report, published 2026-01-21. Source