You're looking at this from the consumer point of view. But consumers provide income, not capital.

Consumers may, or may not, have a choice of power providers. They can choose to "accept" what is on offer, or remove themselves from the grid. But they have very little negotiating power.

Actually it's pretty easy for (residential and office consumers to spend their own capital on batteries and inverters. Most homes consume (or can be set to consume) reasonably low power at night. A 20 kw/h battery will cover most homes easily.

(Solar panels aren't necessary for this.)

The capital cost, and savings therefrom, put a hard limit on what suppliers can charge for night time power. And of course storage is just as attractive to suppliers. (More capital-attractive than say a nuclear plant.)

As consumers we are used to simply announcing our needs. And assuming companies will expend any capital necessary to meet those needs. In practice it doesn't work that way, as rural phone/internet/cable consumers will testify.

Once you see electricity generation as a capital issue, not a consumer issue, things get clearer.