Daily · As of Sep 14, 2026 · Open source

8.7 GWh curtailed in California yesterday

Solar and wind the grid could not take. Sep 13, 2026 · 2 ISOs tracked.

150.5 GWhSolar · 30d
330.6 GWhWind · 30d
481.1 GWhTotal · 30d
2ISOs tracked

Curtailment by ISO

SPPSouthwest Power Pool
Sep 14, 2026
Solar curtailed
3.6 GWh
Wind curtailed
83.7 GWh
Solar · 30d23.8 GWh
Wind · 30d327.6 GWh
90-day trend
SolarWind
SPP · kardashev-data
CAISOCalifornia
Sep 13, 2026
Solar curtailed
8.7 GWh
Wind curtailed
87 MWh
Solar · 30d126.7 GWh
Wind · 30d3.0 GWh
90-day trend
SolarWind
CAISO · kardashev-data
The duck curve: midday solar dips net load, evening demand peaks

What is Published Curtailment?

When the grid can't absorb all available solar and wind, operators instruct generators to produce less, even when the sun is shining. These pages show Published Curtailment at the ISO/fuel grain the ISO already publishes. Negative prices are Markets stress, not curtailment.

CAISO leads in solar curtailment (the duck curve). SPP leads in wind curtailment across the Great Plains.

Wind turbines on the Great Plains at dusk

Open source

kardashev-data API · Next.js. CAISO + SPP live. Fork it, add yours.

View on GitHub