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Net Internal Demand, Capacity Resources, and Capacity Margins by North American Electric Reliability Council Region                                          
Table 3.2.    xls     pdf   format     

Table 3.2.  Net Internal Demand, Capacity Resources, and Capacity Margins by North American Electric Reliability Council Region, Summer, 1995 through 2006
(Megawatts)
Region and Item 2006 2005 2004 2003 2002 2001 2000 1999 1998 1997 1996 1995
ECAR[1]
Net Internal Demand[2] NA NA 95,300 98,487 101,251 100,235 98,651 94,072 92,359 91,103 88,573 85,643
Capacity Resources[3] NA NA 127,919 123,755 119,736 113,136 115,379 107,451 105,545 105,106 104,953 103,003
Capacity Margin (percent)[4] NA NA 25.5 20.4 15.4 11.4 14.5 12.5 12.5 13.3 15.6 16.9
ERCOT
Net Internal Demand[2] 62,669 59,060 58,531 59,282 55,833 55,106 53,649 51,697 50,254 47,746 45,636 44,990
Capacity Resources[3] 71,156 66,724 73,850 74,764 76,849 70,797 69,622 65,423 59,788 55,771 55,230 55,074
Capacity Margin (percent)[4] 11.9 11.5 20.7 20.7 27.3 22.2 22.9 21 15.9 14.4 17.4 18.3
FRCC
Net Internal Demand[2] 43,824 45,950 42,243 40,387 37,951 38,932 35,666 34,832 34,562 32,874 31,868 31,649
Capacity Resources[3] 53,171 50,200 48,579 46,806 43,342 42,290 43,083 40,645 39,708 39,613 38,237 38,282
Capacity Margin (percent) 17.6 8.5 13 13.7 12.4 7.9 17.2 14.3 13 17 16.7 17.3
MAAC[1]
Net Internal Demand[2] NA NA 52,049 53,566 54,296 54,015 51,358 49,325 47,626 46,548 45,628 45,224
Capacity Resources[3] NA NA 66,167 65,897 63,619 59,533 60,679 57,831 55,511 56,155 56,774 56,881
Capacity Margin (percent)[4] NA NA 21.3 18.7 14.7 9.3 15.4 14.7 14.2 17.1 19.6 20.5
MAIN[1]
Net Internal Demand[2] NA NA 50,499 53,617 53,267 53,032 51,845 47,165 45,570 45,194 44,470 43,229
Capacity Resources[3] NA NA 65,677 67,410 67,025 65,950 64,170 55,984 52,722 52,160 52,880 52,112
Capacity Margin (percent)[4] NA NA 23.1 20.5 20.5 19.6 19.2 15.8 13.6 13.4 15.9 17
MRO (U.S.)[5]
Net Internal Demand[2] 41,754 38,266 29,094 28,775 28,825 27,125 28,006 30,606 29,766 28,221 27,298 27,487
Capacity Resources[3] 49,792 46,792 35,830 33,287 34,259 32,271 34,236 35,373 34,773 34,027 33,121 32,665
Capacity Margin (percent)[4] 16.1 18.2 18.8 13.6 15.9 15.9 18.2 13.5 14.4 17.1 17.6 15.9
NPCC (U.S.)
Net Internal Demand[2] 59,727 57,402 51,580 53,936 55,164 55,888 54,270 53,450 51,760 50,240 48,950 48,290
Capacity Resources[3] 70,607 72,258 71,532 70,902 66,208 63,760 63,376 63,077 60,439 60,729 58,592 62,368
Capacity Margin (percent)[4] 15.4 20.6 27.9 23.9 16.7 12.3 14.4 15.3 14.4 17.3 16.5 22.6
ReliabilityFirst[6]
Net Internal Demand[2] 179,600 190,200 NA NA NA NA NA NA NA NA NA NA
Capacity Resources[3] 213,792 220,000 NA NA NA NA NA NA NA NA NA NA
Capacity Margin (percent)[4] 16 13.5 NA NA NA NA NA NA NA NA NA NA
SERC
Net Internal Demand[2] 196,111 186,049 153,024 148,380 154,459 144,399 151,527 142,726 138,146 134,968 109,270 105,785
Capacity Resources[3] 231,123 219,749 182,861 177,231 172,485 171,530 169,760 160,575 158,360 155,016 126,196 127,562
Capacity Margin (percent)[4] 15.1 15.3 16.3 16.3 10.5 15.8 10.7 11.1 12.8 12.9 13.4 17.1
SPP
Net Internal Demand[2] 42,266 41,079 39,383 39,428 38,298 38,807 39,056 37,807 36,402 37,009 59,017 57,951
Capacity Resources[3] 46,564 46,376 48,000 45,802 47,233 45,530 46,109 43,111 42,554 43,591 69,344 69,354
Capacity Margin (percent)[4] 9.2 11.4 18 13.9 18.9 14.8 15.3 12.3 14.5 15.1 14.9 16.4
WECC (U.S.)
Net Internal Demand[2] 134,157 128,464 121,205 120,894 117,032 107,294 116,913 112,177 111,641 104,486 101,728 99,612
Capacity Resources[3] 169,950 160,026 155,455 150,277 142,624 124,193 141,640 136,274 135,270 135,687 135,049 130,180
Capacity Margin (percent)[4] 21.1 19.7 22 19.6 17.9 13.6 17.5 17.7 17.5 23 24.7 23.5
Contiguous U.S.
Net Internal Demand[2] 760,108 746,470 692,908 696,752 696,376 674,833 680,941 653,857 638,086 618,389 602,438 589,860
Capacity Resources[3] 906,155 882,125 875,870 856,131 833,380 788,990 808,054 765,744 744,670 737,855 730,376 727,481
Capacity Margin (percent)[4] 16.1 15.4 20.9 18.6 16.4 14.5 15.7 14.6 14.3 16.2 17.5 18.9
  [1] ECAR, MAAC, and MAIN dissolved at the end-of-2005.  Utility membership joined other reliability regional councils. Also, see Footnote 6.
  [2] 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.
  [3] 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.
  [4] Capacity Margin is the amount of unused available capability of an electric power system at peak load as a percentage of capacity resources.
  [5] Regional name has changed from Mid-Continent Area Power Pool to Midwest Reliability Organization.
  [6] 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.
  NA = Not available. 
  Notes: NERC Regional Council names may be found in the Glossary reference. 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 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 3.3. Net Internal Demand, Actual or Planned Capacity Resources, and Capacity Margins by North American Electric Reliability Council Region 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