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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, 2007 through 2012
(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)[2]
  2007/ 2008 2008/ 2009
TRE (formerly ERCOT) 46,068 75,504 39 47,066 78,279 39.9
FRCC 46,093 57,510 19.9 46,901 59,878 21.7
MRO (U.S.)[4] 34,358 44,987 23.6 35,551 46,724 23.9
NPCC (U.S.) 46,185 75,772 39 46,773 76,515 38.9
ReliabilityFirst[5] 141,200 212,257 33.5 143,300 214,510 33.2
SERC 176,766 229,627 23 180,417 231,313 22
SPP 31,455 50,223 37.4 32,101 51,479 37.6
WECC (U.S.) 113,504 167,770 32.3 115,628 169,083 31.6
Contiguous U.S. 635,629 913,650 30.4 647,737 927,781 30.2
  2009/ 2010 2010/ 2011
TRE (formerly ERCOT) 48,031 80,424 40.3 48,834 80,447 39.3
FRCC 47,963 61,580 22.1 49,041 64,007 23.4
MRO (U.S.)[4] 36,272 46,877 22.6 36,861 47,299 22.1
NPCC (U.S.) 47,192 72,950 35.3 47,719 73,591 35.2
ReliabilityFirst[5] 145,800 217,555 33 147,700 217,827 32.2
SERC 183,007 231,881 21.1 186,795 233,712 20.1
SPP 32,803 53,173 38.3 33,439 53,288 37.2
WECC (U.S.) 117,517 170,745 31.2 119,442 171,721 30.4
Contiguous U.S. 658,585 935,184 29.6 669,831 941,892 28.9
  2011/ 2012 2012/ 2013
TRE (formerly ERCOT) 49,371 81,372 39.3 50,553 81,372 37.9
FRCC 50,104 65,107 23 51,055 66,615 23.4
MRO (U.S.)[4] 37,436 47,292 20.8 37,720 48,040 21.5
NPCC (U.S.) 48,258 73,759 34.6 48,813 73,599 33.7
ReliabilityFirst[5] 149,100 217,827 31.6 150,600 217,967 30.9
SERC 188,972 235,730 19.8 192,386 235,589 18.3
SPP 34,021 53,730 36.7 34,705 54,084 35.8
WECC (U.S.) 121,657 171,862 29.2 123,604 172,202 28.2
Contiguous U.S. 678,918 946,679 28.3 689,435 949,467 27.4
  [1] Net Internal Demand represent the system demand that is planned for by the electric power industry`s reliability authority and is equal to Internal Demand less Direct Control Load Management and Interruptible Demand.
  [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 the end of February of the following year. For example, winter 2004/2005 begins December 1, 2004, and extends to 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.
  Source: 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