MARTIN BOND / SCIENCE PHOTO LIBRARY MARTIN BOND / SCIENCE PHOTO LIBRARY
Electricity from natural gas. View of a modern gas-fired power station. In the foreground are pipes which carry cooling water to the plant. This power station is one of the new combined-cycle types, and produces about 220 MW (megawatts) of electricity. The gas is burnt in a turbine, like a jet engine, which drives a generator. The hot exhaust gases are then used to boil water, the steam passing through a second turbine and generator. In a combined heat and power (CHP) system, the water would then be piped away to provide domestic or industrial heating. This 'double' use of the gas gives a very high thermal efficiency. Photographed at Roosecote, Cumbria.
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