Oh,,right! Those "45 new nuclear plants".... There are VERY good reasons why no new nuclear plants have been built for years.

It takes a LOT of money to build one, and years to do so.
Sites are VERY hard to find, and many communities fight them. (NIMBY)
They require a lot of maintenance and training of staff.
The details and plans for storing of nuclear waste is NOT a settled matter.
They are serious targets for would-be terrorists.
They require a bureaucracy and an inspection program that is hard to impliment.

and....

Three Mile Island & Chernobyl

this is not to say that 'some' nuclear plants could not be built on a case-by-case analysis in the future, but 45 NOW is crazy.