Assumptions to the Annual Energy Outlook 2001 - Table 3. Coal-Related Methane Assumptions

	Northern Appalachia	Central Appalachia	Southern Appalachia	Eastern Interior	Western
Fraction of underground coal production at:
Gassy mines	0.885	0.368	0.971	0.876	0.681
Nongassy mines	0.115	0.632	0.029	0.124	0.319

Production from mines with degasification systems (fraction of underground production)	0.541	0.074	0.810	0.067	0.056

Emission factors (kilograms methane per short ton of coal produced)
Underground Mining
Gassy mines	6.047	5.641	27.346	2.988	6.027
Nongassy mines	0.362	0.076	15.959	0.285	0.245
Degassified mines	4.085	37.724	22.025	0.310	0.000
Surface Mining	0.706	0.706	0.706	0.706	0.706

Post-Mining, underground-mined	1.505	1.505	1.505	1.505	1.505
Post-Mining, surface-mined	0.061	0.061	0.061	0.061	0.061
Methane recovery at active coal mines (million metric tons carbon equivalent)	United States
1999	5.842
2000	5.908
2005	6.250
2010	6.613
2015	6.996
2020	7.401
Source: Emissions factors and data sources from Energy Information Administration, Emissions of Greenhouse Gases in the United States 1999, DOE/EIA-0573(99), (Washington, DC, October 2000).