And if it isn't but you want them to use it anyway, that's easy too -- put a carbon tax on that coal fired grid power so that the solar is cheaper and they're back to doing what you want them to.
But don't expect them to choose to lose money while their competitors burn coal, undercut them and put them out of business because you decided that them doing that should be perfectly legal.
> But don't expect them to choose to lose money while their competitors burn coal, undercut them and put them out of business because you decided that them doing that should be perfectly legal.
The problem is that entrenched corporations more or less own governments, so they get the laws that work for them.
So what are you proposing to do about it?
Notice also that the corporations in this case are the fossil fuel companies, not the data center companies. To Amazon a marginal increase (if that) in energy costs to use solar is just something they get to mark up and pass on to the customer, as long as their competitors have to do the same thing. To oil and coal companies an effective carbon tax is ultimately the end of their business and they'll use every dirty trick in the book to try to prevent that.
So how do you get a much-needed carbon tax when it would cost oil and coal companies literally trillions of dollars and they'll fight that hard to prevent it? What's your proposal?