Renewable energy is the only sustainable energy source. Not relying on depletable fossil fuel, producing no air pollution, and capable to be located near the consumer, renewable energy presents great promises but also enormous challenges. The main renewable energies are … Continue reading
Solar is still a future promise. The cost of energy from solar cells has dropped sharply in the past few decades. One kilowatt-hour of electricity — the energy to light a 100-watt bulb for 10 hours — used to cost … Continue reading
Wind power is already practical in many places like Denmark, where 17 percent of the electricity comes from wind turbines. The newest turbines, with propellers as wide in diameter as a football field, produce energy at a cost of 4 … Continue reading