It's easy to getheat out in space on space stations in orbit, because there's no atmosp[ere to dilute the power of the sun's rays. Forget all this fusion/fission/coal/biomass/windfarm stuff. Fill plenty of hot water bottles with cold water(or just get a pile of bricks ) and fly them to the Skylab space station. Put them on the sunny side till hot. Bring them back down. Simple. All the energy you want.