The true solution in my opinion is proper energy management. Using the right fuel for the application, and trying to maximize efficiencies. Plug loads are a huge problem.
I am a big believer in Nuclear energy, and geothermal energy.
But mot in the ways that you think, I believe its is to use the ground temperatures to moderate ventilation and air conditioning directly. This is happening in some big buildings in Northern Europe.
Ocean Cooling is happening Hawaii, Lake cooling in Toronto.
There are big district system in Russia that are much more effective, because they generate electricity and then share the heat with the communities. New York City is pioneer this technology in some of their new Office towers.
Some of this technology is hard to implement on a small scale because of tenant metering. People in North America don't like to share.
In warm enough places (ground temperature) use Rakine power generation (Nevada, etc.) They are doing a big Rakine project in North Dakota.
I also believe in Plug-in hybrids, I think the technology is closer then many realize, and there are kits right now for some hybrids to turn them into plugin hybrids.
I think Nordic wrote about Data centers. Data center design electricity is going to be about 10X higher in the near future.
Presently most major data centers are about 7kW a rack, with increased power requirements, streaming movies, HD Content, Cell phone videos, the new data centers (5 years) will be around 80kW a rack.
The EPA knows this is about to happen and has started some new power requirements for electrical devices.