All of the Above
Let private technology provide the best solutions. It brought us from wood and coal stoves to power plants that improved the living standard for the world.
"All of the above" is the only answer with the cost-benefit analysis made by experts at companies specializing in the various sources. Technology available today can scrub CO2 emissions from smokestacks in the 85-95% range and we have a 1,000 year supply of coal. But we're selling it to the Chinese/Indians/etc at sale prices while they build dirty plants and undercut the West with subsidized solar/wind/etc.
We really need new nuclear, coal and natural gas power solutions to make the economy work. Yes to wind but no to solar in the short term. Invest in R&D but stop with the pie-in-the-sky theories of solar saving us. Yes to R&D in fuel cells and other exotics but don't hold your breath.
We either produce the power needed for our economy to grow or we will reduce our standard of living for all Americans - especially the middle and lower classes.
Get the lawyers and government out of it and let the experts figure it out. Obama says "All of the above" but I think he has his fingers crossed behind his back. Lovely politics.