The problem with wind/solar generation is storage to even out supply and offer base load as generation is interrupted when the sun don't shine and the wind don't blow.
I think that we are being far too clever when it comes to solving this conundrum as our forebears have already figured this out with the long case clock.
Britain is full of redundant deep seam coal mines with shafts descending hundreds of metres.
Heavy duty winding machines at the old pit heads, connected to massive weights via a chain of reduction gears and a heavy duty electric motor/generator could wind the weights up when power was in surplus and generate when peaks required base load....does't matter if the shafts are flooded although it would probably act as a big pump if the fit of the weight to the shaft was tight.
There are a number of systems at various stages that use this principle.
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