Large DCs and Utilities should pool their resources into dedicated organisations that build large nuclear power plants regularly. I think that will lead to the cheapest electricity for them.

The clean, dense, non-intermittent power provided by nuclear reactors is extremely valuable.

Unless you are located near a hydroelectric dam, there is really no substitute.

Here is a quote from Yann LeCun (Vice-President, Chief AI Scientist at Meta):

  AI datacenters will be built next to energy production sites that can produce 
  gigawatt-scale, low-cost, low-emission electricity continuously.

  Basically, next to nuclear power plants.

  The advantage is that there is no need for expensive and wasteful
  long-distance distribution infrastructure.

  Note: Yes, solar and wind are nice and all, but they require lots of land
  and massive-scale energy storage systems for when there is too little sun
  and/or wind. Neither simple nor cheap.