Solar Panels, worth it or not? : r/UKPersonalFinance
Its only new cars you wont be able to buy. (E.g. being off-grid, or having a backup power supply.) If you switch to an electricity tariff where you pay less at night (5p/kWh seems to be possible right now), then that would go a long way to supply any large energy needs that can be time-shifted: electric car charging, hot water heating, etc