Live · Updated daily · Open source
US Curtailment Tracker
How much solar and wind is thrown away every day — by ISO. Curtailment signals where the grid is congested and where storage is needed.
No data yet — fetcher runs daily at 08:00 UTC
Set DATABASE_URL and run python services/fetcher/fetch.py
What is curtailment?
When the grid can't absorb all available solar and wind, operators instruct generators to produce less — even when the sun is shining. High curtailment signals congested transmission, insufficient storage, or poor demand timing.
CAISO leads in solar curtailment (the duck curve). SPP leads in wind curtailment across the Great Plains.
