Awesome days and cool nights!
I believe our generation is one of the last to enjoy the freedoms of oil based transportation worldwide. Sure electric cars can be refined but what about electric commercial aircraft, cargo ships, fighter jets and alike?
Same thing that happens when the water quits running. This is why there is diversification. Solar, Co-generation, and incineration of solid waste using plasma energy
(plasma arc recycling). Trust me, when the sun quits emitting light you won't have to worry about fossil fuels and nuclear anymore.
Oil can be manufactured. Hydrogen and carbon.
As for wind power. When the wind isn't blowing hydro or solar. Reservoirs are energy storage.