Investing In Solar Energy

[Darren58]

Sun has been a source of energy ever since the planet was formed. Its energy is absorbed by the earth and landmasses. This heat energy can be converted into electricity, at the place where it is to be utilized. The energy of the sun can be tapped in two ways: solar power plants or photovoltaic (PV) devices, commonly known as "solar cells. In solar power plant, the solar radiations are deflected using mirrors into a small space; say a pipe filled with a fluid. The rise in temperature of the fluid can be then used to boil water and produce steam for conventional generator.

The Solar thermal energy is considered to be of two types: Passive and Active techniques. The passive solar techniques involve selecting materials with favorable thermal properties, designing spaces that naturally circulate air, and positioning buildings to maximize sun exposure whereas active solar techniques use photovoltaic panels, pumps and fans to convert sunlight into electricity.

In 2007, the total installed capacity of photovoltaic devices was 8.7 GW. Solar thermal investments have increased by 50% and reached 3,800 megawatts and has been doubling every two years. The cost of solar energy, which has gone down 71% since 1980, will continue to drop as demand increases. Additionally, conversion efficiency of silicon cells has increased from 4% in 1982 to over 20% for the latest technologies.