According to International Energy Agency (IEA) statistics, the average energy value of a ton of coal mined in the United States in 2010 was only 85% of the average mined in 2009.
According to the IEA, net calorific values of coal in the US were:
- 2005 0.632 toe/tonne
- 2008 0.635 toe/tonne
- 2009 0.641 toe/tonne
- 2010 0.543 toe/tonne
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