What are the ups and downs of hydrocarbon, nuclear and space solar based energy? Hydrocarbon power is expensive, pollutive and has many geopolitical chokepoints. With nuclear energy there is always a small chance for a global disaster. The best alternative is renewable energy, especially space solar energy. In space there are no clouds in space, there is no day and night cycle and there is plenty of room. By placing solar collectors above the atmosphere, it will be at least 14 times more effective then land based solar collectors. Afterwards the energy can be send to earth in form of microwave radiation and converted to electricity. The technology for space based energy already exists.