Geothermal would be a direction to explore if you want 24-7 service in a safe manor rather then nuclear power with its obvious pitfalls.
From Wiki:
Estimates of the electricity generating potential of geothermal energy vary from 35 to 2000 GW depending on the scale of investments.
This does not include non-electric heat recovered by co-generation, geothermal heat pumps and other direct use. A 2006 report by the Massachusetts Institute of Technology (MIT), that included the potential of enhanced geothermal systems, estimated that investing 1 billion US dollars in research and development over 15 years would allow the creation of 100 GW of electrical generating capacity by 2050 in the United States alone.
The whole page
http://en.wikipedia.org/wiki/Geothermal_electricity