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Net Internal Demand, Actual or Planned Capacity Resources, and Capacity Margins by North American Electric Reliability Council Region                      
Table 3.3.    xls     pdf   format     

Table 3.3.  Net Internal Demand, Actual or Planned Capacity Resources, and Capacity Margins by North American Electric Reliability Council Region, Summer, 2006 through 2011
(Megawatts)
North American Electric Reliability Council Region
Net Internal Demand[1]
Capacity Resources[2]
Capacity Margin (percent)[3]
Net Internal Demand[1]
Capacity Resources[2]
Capacity Margin (percent)[3]
2006 2007
ERCOT 62,669 71,156 11.9 64,010 71,510 10.5
FRCC 43,824 53,171 17.6 44,880 54,927 18.3
MRO (U.S.)[4] 41,754 49,792 16.1 42,787 49,722 13.9
NPCC (U.S.) 59,727 70,607 15.4 60,676 70,341 13.7
ReliabilityFirst[5] 179,600 213,792 16 182,500 215,296 15.2
SERC 196,111 231,123 15.1 200,073 230,489 13.2
SPP 42,266 46,564 9.2 43,196 47,758 9.6
WECC (U.S.) 134,157 169,950 21.1 136,804 173,695 21.2
Contiguous U.S. 760,108 906,155 16.1 774,926 913,738 15.2
2008 2009
ERCOT 65,383 71,405 8.4 66,830 71,839 7
FRCC 46,033 58,408 21.2 46,930 61,084 23.2
MRO (U.S.)[4] 44,288 49,841 11.1 45,383 50,028 9.3
NPCC (U.S.) 61,715 70,671 12.7 62,689 70,320 10.9
ReliabilityFirst[5] 186,200 216,512 14 189,000 217,119 13
SERC 204,432 235,229 13.1 208,908 242,315 13.8
SPP 44,073 48,097 8.4 44,911 50,309 10.7
WECC (U.S.) 139,704 175,753 20.5 142,514 179,070 20.4
Contiguous U.S. 791,828 925,916 14.5 807,165 942,084 14.3
2010 2011
ERCOT 68,331 72,553 5.8 69,608 73,317 5.1
FRCC 48,016 63,492 24.4 49,006 67,215 27.1
MRO (U.S.)[4] 46,118 50,445 8.6 47,036 50,868 7.5
NPCC (U.S.) 63,696 70,320 9.4 64,661 70,320 8
ReliabilityFirst[5] 191,900 217,734 11.9 194,200 217,815 10.8
SERC 212,603 246,919 13.9 216,726 251,507 13.8
SPP 45,711 51,544 11.3 46,463 52,491 11.5
WECC (U.S.) 145,237 180,214 19.4 147,896 180,126 17.9
Contiguous U.S. 821,612 953,221 13.8 835,596 963,659 13.3
  [1] Net Internal Demand represents the system demand that is planned for, which is set to equal Internal Demand less Direct Control Load Management and Interruptible Demand by the electric power industry`s reliability authority.  See Technical Notes for detailed definitions.
  [2] Capacity Resources:  Utility- and IPP-owned generating capacity that is existing or in various stages of planning or construction, less inoperable capacity, plus planned capacity purchases from other resources, less planned capacity sales.
  [3] Capacity Margin is the amount of unused available capability of an electric power system at peak load as a percentage of capacity resources.
  [4] Regional name has changed from Mid-Continent Area Power Pool to Midwest Reliability Organization.
  [5] ReliabilityFirst Corporation (RFC) came into existence on January 1, 2006, and submitted a consolidated filing covering the historical NERC regions of ECAR, MAAC, and MAIN.  Many of the former utility members joined RFC.
  Notes: Actual data are final. Projected data are updated annually, so revision superscript is not used. Represents an hour of a day during the associated peak period. The summer peak period begins on June 1 and extends through September 30. The MRO, SERC, and SPP regional boundaries were altered as utilities changed reliability organizations.  The historical data series have not been adjusted. Totals may not equal sum of components because of independent rounding.
  Sources:  Energy Information Administration, Form EIA-411, "Coordinated Bulk Power Supply Program."
More Tables on Demand, Capacity Resources, and Capacity Margins:
formats
Table 3.2.  Net Internal Demand, Capacity Resources, and Capacity Margins by North American Electric Reliability Council Region, Summer html pdf xls
Table 3.4. Net Internal Demand, Actual or Planned Capacity Resources, and Capacity (Megawatts) html pdf xls

see also:
Electric Power Monthly
Electric Power Annual
annual electricity statistics back to 1949
projected electricity capacity to 2030
international electricity statistics