Here is an update on the state of things.
California buys batteries to cover energy shortages - DailyKos
GE announces it will stop making coal-fired power plants -DailyKos
Unilever Promises Fossil Fuel-Free Cleaning Products by 2030 - Bloomberg
15 states will follow California's push to electrify trucks and buses - The Verge
After 92 Years, Exxon Dropped From Dow Jones | Crooks and Liars
It appears that oil and coal are on the way out. If there are no companies making coal-powered electricity, then the remaining existing plants will simply get old and become worn-out or economically non-viable. They'll be shut down.
It appears also that as battery technologies improve, there will be no reason for electric companies to not use sunlight and wind (or other green renewable energy sources) to generate electricity and to store it in batteries for use during the day. At first it will be to replace the current peaking power plants.