<P> U.S. coal - fired electricity - generating power plants owned by utilities emitted an estimated 48 tons of mercury in 1999, the largest source of man - made mercury pollution in the U.S. In 1995 - 96, this accounted for 32.6% of all mercury emitted into the air by human activity in the U.S. In addition, 13.1% was emitted by coal - fired industrial and mixed - use commercial boilers, and 0.3% by coal - fired residential boilers, bringing the total U.S. mercury pollution due to coal combustion to 46% of the U.S. man - made mercury sources . In contrast, China's coal - fired power plants emitted an estimated 200 ± 90 tons of mercury in 1999, which was about 38% of Chinese human - generated mercury emissions (45% being emitted from non-ferrous metals smelting). Mercury in emissions from power plants can be reduced by the use of activated carbon . </P> <P> In 2007 an advertising campaign was launched to improve public opinion on coal power titled America's Power . This was done by the American Coalition for Clean Coal Electricity (then known as Americans for Balanced Energy Choices), a pro-coal organization started in 2000 . </P> <P> In the face of increasing electricity demand through the 2000s, the US has seen a "Growing Trend Against Coal - Fired Power Plants". In 2005 the 790 MW Mohave Power Station closed rather than implement court ordered pollution controls . In 2006 through 2007 there was first a bullish market attitude towards coal with the expectation of a new wave of plants, but political barriers and pollution concerns escalated exponentially, which is likely to damage plans for new generation and put pressure on older plants . In 2007, 59 proposed coal plants were cancelled, abandoned, or placed on hold by sponsors as a result of financing obstacles, regulatory decisions, judicial rulings, and new global warming legislation . </P> <P> The Stop Coal campaign has called for a moratorium on the construction of any new coal plants and for the phase out of all existing plants, citing concern for global warming . Others have called for a carbon tax and a requirement of carbon sequestration for all coal power plants . </P>

What state has the most coal fired power plants