The Promise of Solar Energy
All life on earth is supported by the sun. This amazing resource radiates energy and provides us both heat and light by fusing hydrogen into helium at its core. We call this solar radiation. Only about half of this solar radiation makes it to the Earth’s surface. The rest is either absorbed or reflected by clouds and the atmosphere. Still, we receive enough power from the sun to meet the power demands of all mankind — millions of times over. Solar energy—power from the sun—is a vast, inexhaustible, and clean resource.
The solar resource is enormous. According to the US Department of Energy, the amount of sunlight that strikes the earth’s surface in an hour and a half is enough to handle the entire world’s energy consumption for a full year. Just 18 days of sunshine on Earth contains the same amount of energy as is stored in all of the planet’s reserves of coal, oil, and natural gas.And, once a system is in place to harness the solar resource and convert it into useful energy, the fuel is free.
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