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Net Internal Demand, Actual or Planned Capacity Resources, and Capacity Margins by North American Electric Reliability Council Region                      
Table 3.4.    xls     pdf   format     

Table 3.4.  Net Internal Demand, Actual or Planned Capacity Resources, and Capacity Margins by North American Electric Reliability Council Region, Winter, 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 2007/ 2008
ERCOT 46,038 71,451 35.6 47,118 74,286 36.6
FRCC 45,993 56,896 19.2 47,112 59,246 20.5
MRO (U.S.)[4] 34,582 46,959 26.4 35,736 47,999 25.5
NPCC (U.S.) 48,394 76,110 36.4 49,123 75,947 35.3
ReliabilityFirst[5] 147,800 220,930 33.1 149,700 222,542 32.7
SERC 173,036 231,917 25.4 176,412 232,732 24.2
SPP 30,469 47,199 35.4 31,096 47,855 35
WECC (U.S.) 107,586 166,362 35.3 109,489 170,097 35.6
Contiguous U.S. 633,898 917,824 30.9 645,786 930,704 30.6
2008/ 2009 2009/ 2010
ERCOT 48,237 74,221 35 49,201 75,572 34.9
FRCC 47,991 62,703 23.5 49,029 65,760 25.4
MRO (U.S.)[4] 36,726 48,325 24 37,569 48,785 23
NPCC (U.S.) 49,683 75,382 34.1 50,306 75,922 33.7
ReliabilityFirst[5] 151,600 223,172 32.1 153,700 224,379 31.5
SERC 180,072 233,256 22.8 182,480 237,419 23.1
SPP 31,769 48,953 35.1 32,391 50,590 36
WECC (U.S.) 111,742 172,096 35.1 113,694 174,846 35
Contiguous U.S. 657,820 938,108 29.9 668,370 953,273 29.9
2010/ 2011 2011/ 2012
ERCOT 49,922 76,372 34.6 51,257 76,392 32.9
FRCC 50,064 68,151 26.5 51,117 71,112 28.1
MRO (U.S.)[4] 38,108 49,162 22.5 38,780 49,624 21.9
NPCC (U.S.) 50,921 75,922 32.9 51,710 75,922 31.9
ReliabilityFirst[5] 156,000 224,334 30.5 157,700 224,359 29.7
SERC 185,661 242,897 23.6 188,346 246,507 23.6
SPP 32,958 51,438 35.9 33,506 52,439 36.1
WECC (U.S.) 115,225 176,124 34.6 116,888 176,389 33.7
Contiguous U.S. 678,859 964,400 29.6 689,304 972,744 29.1
  [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 winter peak period begins on December 1 and extends through end-of-February of the following year. For example, winter 2004/2005 begins December 1, 2004, and extends February 28, 2005 The MRO, SERC, and SPP regional boundaries were altered as a variety of 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 3.3.  Net Internal Demand, Actual or Planned Capacity Resources, and Capacity Margins by North American Electric Reliability Council Region, Summer 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