I think you might be slightly missing the point here.

One problem with 'traditional' generation methods is that they are inefficient to keep stopping and starting (cf. coal-fired boiler or nuclear reactor!) — it is better to keep generating continuously. Hence we have evolved ways of using energy that enable producers to sell this otherwise 'waste' capacity to consumers, in the form of, for example, cheap off-peak night tariffs.

I've read a story, don't know if it's actually true, that Westinghouse (I think it was) in the US originally started generating power for industrial use, but found they had redundant capacity outside working hours, so they hit upon the 'novel' idea of selling 'spare' electricity to the public for lighting their homes etc.

All this is of course very wasteful of natural resources, inasmuch as it would be better to only generate just as much electricity as is actually needed at any given moment (instead of looking for uses to absorb superfluous production); or, in the case of fickle power sources like solar or wind, better still to only use power when it is freely available — hence the long-standing quest for a satisfactory way of 'storing' electricity!