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The Sun. Most of the energy we capture for use on Earth originates in the nuclear reactions powering our Sun. Coal, oil, natural gas, biomass, and even the wind and hydropower we harness to generate electricity, originally derive their energy content from the Sun. Learn how our local star is the ultimate energy source.ost of the energy we capture for use on Earth originates in the nuclear reactions powering our Sun. Coal, oil, natural gas, biomass, and even the wind and hydropower we harness to generate electricity, originally derive their energy content from the Sun.
It is energy that can be harnessed to do work. The water stored behind a dam has free energy. When allowed to fall through a turbine, it can generate electricity (another form of free energy). But for biologists, the most interesting form of free energy is the energy stored in chemical bonds.t is energy that can be harnessed to do work. The water stored behind a dam has free energy. When allowed to fall through a turbine, it can generate electricity (another form of free energy). But for biologists, the most interesting form of free energy is the energy stored in chemical bonds.