It's all doable. Quite easily and without bankrupting everyone. Heating from ground and water source heat provides a thoroughly well documented 4 to 6 fold inc

It's all doable. Quite easily and without bankrupting everyone. Heating from ground and water source heat provides a thoroughly well documented 4 to 6 fold increase in efficiency and still works even when the sea or ground is only at a small differential and the absolute temperature is single digits above freezing. You don't need a handy nuclear plant or gobs of geo-thermal like Iceland. You power the pump and heat exchangers from spare renewable capacity, the heat comes from the ground, sea or river. It works well enough in the Nordic countries and N Scotland (Orkney) to be fairly popular. Of course they benefit from going a bit deeper with ground source which further encourages community over individual installations, but sea works surprisingly well even at those latitudes. Fully becalmed is pretty rare for much of the planet even when onshore is still. There is often wind a little offshore and the waves can result from winds pretty far offshore. Not forgetting tidal and pressure contributions. Sure, some areas will be less suited to wave or tidal than others, just as the UK is far better served by wind than solar. Though solar is still effective enough to be worth installing. Install the right mix for local geography and climate, balance with the national or regional grid. You're right that pumped hydro is particularly constrained by suitable geography, but there's plenty of spots it could be added to the grid still, just not in Florida, Kansas or The Netherlands. :) Insulation isn't so hard either if you promote insulation for existing structures or apply judicious subsidy. New build should, of course, be better and we're a long way from achieving the insulation standards of Nordic countries. UK for instance had a decade of promoting and requiring the energy companies to provide subsidised installation of roof and wall insulation. It was remarkably popular, and pretty damn effective. Not all buildings were suitable of course, but start with the easier ones to get an 80% fix, then worry about the difficult sites and edge cases for the next steps.