Need a diversified energy supply porfolio - aka all of the above - to make energy affordable, accessible, and reliable.
Too much dependence on any one source is a security and economic liability.
So, when there's a coal miner's strike, the lost generation can be made up by nuclear, gas, oil, hyrdo, solar, wind, biomass, etc.
Each type of energy also needs to be multi-sourced to reduce economic and security liabilities to any single supplier.
Energy supply chain risk needs to be managed, via diversification and redundancies, to limit vulnerability to economic and national security risks and disruptions.