A coal-fired power
plant produces electricity, usually for public consumption, by burning
coal to boil water, producing steam which drives a steam turbine which turns an
electrical generator.
Coal is a relatively cheap
fuel with some of the largest deposits in politically stable regions (China,
India and the US) thus generally offering a more stable supply than natural gas
and oil, the largest deposits of which are located in the more politically
volatile Persian Gulf. The combustion of any fuel, including coal, emits large
amounts of carbon dioxide into the atmosphere, contributing to global warming;
coal also emits other pollutants such as sulfur,
nitrogen, small particulates, and heavy metals like mercury and uranium (which
is naturally present in coal). These other pollutants have been linked to acid
rain, smog, and a variety of health problems.
As of 2009 the largest
coal-fired power plant is Kendal Power Station, South Africa. The world's
most energy-efficient coal fired power plant is the Avedøre Power Plant in Denmark.