It’s a ban on any DC over 20 megawatts, regardless of site or situation - that’s a blanket ban because there’s no exceptions or justifications for the ban to apply to every large DC, regardless of location.
From what I can tell, case law on takings via this kind of regulation is “case by case”, without a clear test for when it crosses over the line into an unreasonable imposition on property rights.
It's a pause. And not a particularly long one either.
Maine is saying "we don't have the legal infrastructure to make sure we can build these out in a way that protects the environment and our residents so let's put a pause on building while we build up that framework"