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Ammonia as a hydrogen store air+methane+temp and high high pressure. Pump liquid uphill as another option for potential energy minus evaporation losses and friction. Geothermal as year round steady state thermal process, I don’t know how those scale capacity.

My question about completely off grid housing and renewable sources and energy stores is that an isolated small scale unit will assuredly operate industrial processes at a lower efficiency than a centralized industrial facility, barring transmission loss. Economy of scale is real for thermodynamic costs and monetary cost. So any gas compression or thermal cycle or liquid pumps is self serving with higher personal capital cost and cost of run and maintenance reliability. And if enough of your neighbors do it it’s “renewable” but nowhere near sustainable.

How to turn sunlight into methane? Electrochemistry and membranes or catalysts? That seems like not a worthwhile question facing us if there is earnest need for energy transition for sustainability.

If you’re wealthy enough to have an off grid ranch or cabin and don’t want the baggage of society to replenish your winter energy needs then purchase in W texas and build a boutique diesel rig and refinery. Or purchase a bunch of land with fast growing pines and run a logging operation. If you want to live off grid but can manage paying money for society goods and services run diesel generators with long term fuel oil contracts and rig up a decarbonization unit on the exhaust stack.

Localized next gen storage isn’t a pressing matter in my opinion. Especially that benefiting anti-social people with means to live off grid but comfortably. If you have millions of emissions points it’s harder to control than a centralized regulated plant.