Energy conservation shifting demand to off-peak hours nuclear, hydro [update] wind oil, gas; the global warming costs of past usage may easily climb into the tens of trillion USD range coal
It's odd to think of giant nuclear plants as a tool for the masses. The only thing I can think of to reconcile the two views is that nuclear's non-modularity (you need a half-dozen nuclear plants to get to the cheap rates) adds extra non-monetary costs.
I've learned a great deal about energy production in the last year, since I first made that list.