On a low demand Sunday - CAISO is seeing a large (2000+MW) amount of exports. This is due to excess solar which is being taken by neighboring states. Because of this overall CO2 emissions dipped below zero. It will be interesting to see if this turns into a trend and if it continues for longer stretches of time in the future.

Obviously these are not true negative emissions for the Western grid as a whole. They are just negative for CAISO accounting. However, the more solar from CA that neighboring states use the quicker the remaining coal plants in West will close.