Solar panels and battery storage should be a condition of building regs (where practicable to fit them) on all houses, as a percentage of the total cost they are cheap.
I have both, and over a 12 month period I am pretty much energy neutral cost wise. That is for 'lecky and gas, my summer 'leccy export pretty much pays for my winter gas, hence me saying all new properties should have them. I simply cannot understand why it isn't happening.
My Panels (3.7Kw max) are currently producing 2.51kw, they face SE so not the ideal S facing, and battery is 8.2Kwh capacity, that's for a 2000 build 3 bed semi, 2 retirees living in it,