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Hydropower is the most efficient way to generate electricity. Modern hydro turbines can convert as much as 90% of the available energy into electricity.
It is produced for an average of 0.85 cents per kilowatt-hour (kwh).
Facts
Thermal energy or heat energy is the part of the internal energy of a thermodynamic system in equilibrium that provides an absolute temperature and is increased or decreased by energy transfer, generally in the form of heat or work, in thermodynamic processes.
Wind energy is the fastest growing mode of electricity production across the planet. In 2012, $25 billion was spent on wind energy investment. Modern turbines harness over 15 times the electricity generated in 1990. Wind power in the U.S. is a $10 billion a year industry!
Solar energy is a renewable energy, obtained from the use of electromagnetic radiation from the Sun.
Solar power is the most abundant energy source on Earth, as to produce it is cheaper than fossil fuels. Solar panel costs have fallen 99% since 1977.