Possibly, I can't find an easy source of spot price over time. https://www.caiso.com/todaysoutlook/pages/supply.html https://www.caiso.com/todaysoutlook/pages/

Possibly, I can't find an easy source of spot price over time. https://www.caiso.com/todaysoutlook/pages/supply.html https://www.caiso.com/todaysoutlook/pages/supply.html is pretty good for total energy used and sources. In the Summer 3-5pm could be demand peak, but looks like the total energy used is high over a few hours, even after sun down.