A "small" datacenter I personally know if in a municipality I am directly involved with generates about $6m/yr in taxes just from the city utilities (electric usage) tariff. That ignores any property taxes and the rest.

This is for a standard "warehouse sized" 100MW facility no one would know exists unless you told them it does which has been there for 20 or so years now. It generates far more taxes for the municipality than buildings of similar footprint next to it, as it's in a light industrial park like most of these things are. Scaled up to 1GW that's $60m/yr in simple "sales tax" on electricity consumption. Property tax is harder to dig through, but ignoring initial 10-20 year abatements typical for such projects it's roughly double that - but that's from memory.

I agree the tax abatements are bullshit. But those are bullshit for any sort of development and imo should be outright illegal at a federal level regardless of the project.

This doesn't account for any local income tax/etc. generated by jobs - where a datacenter of course will not be significant compared to most industrial land uses of similar acreage.

These datacenter facilities have typically been very tax revenue dense land uses for quite some time now without cities needing to invest very much in infrastructure to service them. It's why they generally have sailed through approvals until recently.