Assumptions to the Annual Energy Outlook 2003
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 |
||||
| 2001 |
4.400 |
||||
| 2005 |
4.645 |
||||
| 2010 |
4.970 |
||||
| 2015 |
5.317 |
||||
| 2020 |
5.689 |
||||
| 2025 |
6.087 |
||||
| Source: Emissions factors and data sources from Energy Information Administration, Emissions of Greenhouse Gases in the United States 20001, DOE/EIA-0573(2001), (Washington, DC, December 2002). | |||||