There are several post peak oil energy economies, for this forum I’ll focus on three:
F2 economy: Fusion providing most if not all the input energy. This is base on the unlikelihood of cheap F2 coming out as advertised and quickly.
Transition: Solar, wind, biomass, coal gasification step up as oil falls down. Coal would provide continues energy while solar and wind provide intermittent energy that would be used to charge EV or make hydrogen. Biofuels and coal gasification supplement dwindling oil in doing everything electricity and hydrogen can
