I agree with your idea but granting a utility the right to determine to whom they distribute power is not an easy task nor should it be taken lightly. In order to do that, you have to have regulators make the rule and then utilities obey. Utilities can’t (and shouldn’t) just deny a customer service because they don’t agree with what the customer is going to do with that power. Sanctioned natural monopolies come with regulations in most places. And in order to enforce rules, the wheels of regulatory bodies must churn and we know how slow that can be.

In theory, if you got an entity to bring x megawatts of renewable capacity online as a requirement of a new electric service load, you could tie production to data center use. Then if you ensured that the customer had controllable load to match the output of the corresponding renewable generation you could have a minimal impact growth. But that’s an absurdly complicated solution that would likely take a decade to develop and implement even if you had the political will.

I do not know what the best solution is other than to make more renewable electricity and store it, and maybe nuclear (if it didn’t take 10 years to build a plant).