A couple of them have been built and they’re just sitting there unpowered

Most of them in California because that State simply cannot get its shitty power grid sorted out. The damn thing barely works at the best of times due to a combination of corruption, greed, and Government interference.

As an example the utility company promised Digital Realty and Stack Infrastructure that they'd have the power ready for them by the time their DCs were built but...SURPRISE...they lied. The only fault for DR and SI here is trusting a California Utility to deliver on their promise.