Comment by trunnell

They mention California. https://www.caiso.com/todays-outlook/supply is a dashboard showing electricity demand and supply, real-time and historical.

Yesterday evening's peak demand was between 7-8pm at 30.7 gigawatts. Supply breakdown around 8pm:

  Batteries: 8.4 GW
  Natural gas: 6.0 GW
  Renewables: 5.4 GW
  Large hydro: 4.4 GW
  Imports: 4.1 GW 
  Nuclear: 2.3 GW

This is a remarkable development. All of the peak demand supplied from batteries used to be supplied by natural gas just a couple years ago.