Question: What is the best renewable energy?

Will Reynolds answered on 19 Jun 2012:

No one really knows when fossil fuels will run out completely. But there will be a point when demand for oil is higher than what we can get out of the ground, which is called ‘peak oil’ and when this happens it will becomes very expensive. It is likely that the rising cost of oil will be the incentive for renewable energy generation to expand and become our main source of energy. There are several different renewable energy technologies that are being developed and they will all need to be used together to provide enough energy. Wind turbines work best on hills and out at sea, wave power is good near the shore and in river esturies, most energy will probably be generated by solar photovoltaic (direct conversion of light to electricity) but these are expensive at the moment and need more development. Biofuels from agricultural waste and algae will be important as a medium term technology because they can be a direct substitute for fossil fuel, but we probably wont be able to produce enough to rely on biofuel alone. Nuclear power is probably going to expand because it is actually a very clean technology, it just has issues with disposing and controlling radioactive waste. In short we will need lots of different solutions to replace fossil fuels and they need to be cheap enough to compete with fossil fuels before they become widely accepted. Hope this helps.