Where can I look up this numbers? (Just curious)

For California, CAISO publishes a ton of data. Here is daily fuel mix - https://www.gridstatus.io/charts/fuel-mix?iso=caiso

You can also see Texas (ERCOT), New York and a few other operators.

Tade0 2 days ago | parent | prev [-]

This is a goldmine of data, how did you find out about it? Thank you so much for sharing

	▲	Tade0 2 days ago \| parent [-]
		By accident really - I heard that electricity prices were decided in hourly auctions, started googling it and there it was. The project is (partly) open source and whenever some data provider changes their API, they welcome contributions to address that: https://github.com/electricitymaps/electricitymaps-contrib