Small-scale gas power is disgustingly cheap and easy to get a permit for.
That said, it doesn't help that data-centers have been confused for the sort of thing that belongs in/near city-limits - there's limitted room, so solar/wind become difficult, and no city wants to permit a nuclear generator in its domain.
I am all-for banning new natural-gas build-out as well, but I approached this issue here from the state level first, since the article said Illinois, not just Chicago ...
... and again, Pritzker is not to be confused for an ally of the environment or the people, at least not where those conflict with AI and "Quantum Tech". He'll just say his constituents need to use less power at the individual/household level. For goddsakes, pressure the hell out of him, threaten to primary him or whatever, on balcony solar, net metering, and basically every solution that's been brought-up in response to this post.