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The overall thermal efficiency of the energy conversion is about 33%. About 1/3 of the coal's chemical energy is converted to electric energy. The remaining 2/3 of the energy is rejected to the environment via cooling water evaporated as low-grade waste heat with poor thermodynamic availability.
The price of metallurgical coal is volatile [112] and much higher than the price of thermal coal because metallurgical coal must be lower in sulfur and requires more cleaning. [113] Coal futures contracts provide coal producers and the electric power industry an important tool for hedging and risk management .
A coal-fired power station or coal power plant is a thermal power station which burns coal to generate electricity. Worldwide there are about 2,500 coal-fired power stations, [ 1 ] on average capable of generating a gigawatt each.
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Coal is the most abundant fossil fuel on the planet, and widely used as the source of energy in thermal power stations and is a relatively cheap fuel. Coal is an impure fuel and produces more greenhouse gas and pollution than an equivalent amount of petroleum or natural gas. For instance, the operation of a 1000-MWe coal-fired power plant ...
In China, coal production increased and coal imports declined. (Trends 1980–2012) The U.S. is a net exporter of coal. [50] US net coal exports increased ninefold from 2006 to 2012, peaked at 117 million short tons in 2012, and were 97 million short tons in 2017. [3] In 2015, 60% of net US exports went to Europe, 27% to Asia. [51]
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In 2015, because of a "glut of both thermal and metallurgical coal", the global price of coal was low. [18]: 11 In 2016, there was a dramatic increase in the price of metallurgical coal to over US$300/tonne. [19]: 3 This was the first time the price of coal had reached this peak since 2011. Investors showed renewed interest in the bituminous ...