TM,
Basically, the things use uranium. We have enough refined uranium already to fuel reactors for a very, very long time. The units are modular, sealed, and designed to be replaced every 10 years or so. There is 0 emissions, the spent units are processed like other nuculur waste, their footprint is tiny.
We could slime up every swimming pool on the planet and not produce enough algae to fuel this country, but every powered thing could be run on the product of nuclear energy.
If we started now, I've heard it said that we could have this entire economy converted to nuclear power in a matter of 2 decades.