[In the US] I got a quote for solar a couple of months ago and it was still coming in as a 20-ish year payback, I guess my usage isn't huge or rates are lower here. I was enthusiastic, but it simply does not pencil out. I also got a bid a battery backup for the whole house, but that was high also, despite press about prices coming down. Total cost for both was about double what I expected to pay, and that would be much more than a generator. The presence of trees shading my house in winter, when power is most needed, means that the system will not perform at top efficiency when new and as the trees grow it will get worse (can't remove them, not my trees and the community has rules against it).

Neighbor across the street is much better placed for it, but that initial cost is so high, I'm sure there won't be a lot of it around here. Twenty year payback is a long long time.