Shared grids, small industrial estate sized battery farms, heated sand, hydrogen generation and recovery.
In the real world [1]:
> South Australia has been effectively powered by green energy for a week, with one expert predicting it could extend to a month by early next year.
> From December 12 to 19, National Energy Market data showed wind and solar contributed on average 103.5 per cent towards the state's energy demand.
> No coal was used during the period, but gas accounted for 5.9 per cent of electricity when renewable sources were not enough to power the state at points at night.
ie. For an entire Australian state total internal renewable production exceeded total usage for a full seven day period - spot excess was exported to neighbouring states, minimal baseline generation in a shortfall period was boosted by gas.
That's a dramatic change from nearly all coal generated power of some years ago.
[1] https://www.abc.net.au/news/2022-12-19/renewable-energy-prod...