Yeah, that’s a step in correct direction, but can you guarantee that everybody can be powered 24/7 through renewables/batteries, specially during winter? Unless that’s the case you still need a shit-ton of non-renewable energy that’s coming either from fossil fuels or nuclear. And if you want to avoid (co2) emissions, then you need nuclear to cover everybody, and if you have nuclear then it has to run 100% 24/7. OTOH if you don’t have nuclear, you’ll emit all sort or crap during those periods. And so on. Also, it’s not just that batteries are sort of expensive, they are big. Also you are talking houses, but masses live in apartments where placing solar panels or batteries isn’t possible (at least in quantity).