Free energy isn't really a possibility, per say, but one just needs to consider the viability of energy that one hasn't considered in quite a while. It was in the late 60s and early 70s that the Americans considered a type of nuclear power that involved Thorium-232, one of the most common materials on the planet. Research ended because Uranium was more efficient and could be used to create nuclear weaponry. Thorium can't be turned into weapons, requires less space and doesn't have quite the same hazards to it.
A couple of links:
http://en.wikipedia.org/wiki/Thorium-based_nuclear_power
http://www.thorium.tv/en/thorium_reactor/thorium_reactor_1.php
There are almost no other power sources on the planet besides oil and nuclear that can supply the needs of the growing population and oil won't last forever. If you want plenty of energy, at least slightly closer to free, Thorium might be the best bet.
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