Table 8.9.B. Winter Net Internal Demand, Capacity Resources, and Capacity Margins
by North American Electric Reliability Corporation Assessment Area, 2012 Actual, 2013-2017 Projected
 

Net Internal Demand (Megawatts) -- Winter
  Eastern Interconnection ERCOT Western Interconnection All Interconnections
Period FRCC NPCC Balance of Eastern Region MAPP MISO PJM SERC SPP TRE WECC Contiguous U.S.
Actual 2012 / 2013 36,409 45,545 386,359 4,925 74,430 122,566 149,359 35,079 46,909 101,706 616,927
Projected 2013 / 2014 43,384 46,008 399,149 5,385 75,320 132,229 145,657 40,558 51,435 107,341 647,317
Projected 2014 / 2015 44,060 46,090 403,883 5,500 76,252 134,742 146,130 41,259 53,742 109,418 657,192
Projected 2015 / 2016 44,596 46,184 408,927 5,563 77,058 137,338 147,201 41,767 55,346 110,814 665,866
Projected 2016 / 2017 45,074 46,546 413,356 5,889 77,370 139,296 148,418 42,383 56,573 112,143 673,691
Projected 2017 / 2018 45,543 46,522 418,458 5,933 78,044 140,430 151,052 42,999 57,232 113,694 681,450

 

Capacity Resources (Megawatts) -- Winter
  Eastern Interconnection ERCOT Western Interconnection All Interconnections
Period FRCC NPCC Balance of Eastern Region MAPP MISO PJM SERC SPP TRE WECC Contiguous U.S.
Actual 2012 / 2013 57,431 79,173 576,569 6,220 110,600 184,185 205,376 70,188 74,107 154,380 941,660
Projected 2013 / 2014 54,993 77,145 565,835 7,207 134,573 188,684 170,284 65,086 72,145 151,849 921,966
Projected 2014 / 2015 57,184 80,211 583,727 7,011 105,650 191,384 205,798 73,883 77,626 154,705 953,453
Projected 2015 / 2016 56,209 80,002 574,634 7,195 100,738 187,909 204,601 74,192 78,134 155,690 944,669
Projected 2016 / 2017 58,187 80,132 570,911 7,027 96,699 189,099 204,084 74,002 80,481 155,873 945,585
Projected 2017 / 2018 56,331 78,646 571,993 6,924 96,768 189,171 204,985 74,145 80,424 156,342 943,736

 

Capacity Margin (Percent) -- Winter
  Eastern Interconnection ERCOT Western Interconnection All Interconnections
Period FRCC NPCC Balance of Eastern Region MAPP MISO PJM SERC SPP TRE WECC Contiguous U.S.
Actual 2012 / 2013 36.6% 42.5% 33.0% 20.8% 32.7% 33.5% 27.3% 50.0% 36.7% 34.1% 34.5%
Projected 2013 / 2014 21.1% 40.4% 29.5% 25.3% 44.0% 29.9% 14.5% 37.7% 28.7% 29.3% 29.8%
Projected 2014 / 2015 23.0% 42.5% 30.8% 21.6% 27.8% 29.6% 29.0% 44.2% 30.8% 29.3% 31.1%
Projected 2015 / 2016 20.7% 42.3% 28.8% 22.7% 23.5% 26.9% 28.1% 43.7% 29.2% 28.8% 29.5%
Projected 2016 / 2017 22.5% 41.9% 27.6% 16.2% 20.0% 26.3% 27.3% 42.7% 29.7% 28.1% 28.8%
Projected 2017 / 2018 19.2% 40.8% 26.8% 14.3% 19.3% 25.8% 26.3% 42.0% 28.8% 27.3% 27.8%

Notes:
NERC region and reliability assessment area maps are provided on EIA's Electricity Reliability web page: http://www.eia.gov/cneaf/electricity/page/eia411/eia411.html
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.
Capacity Resources: Utility and nonutility-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.
Capacity Margin is the amount of unused available capability of an electric power system at peak load as a percentage of capacity resources.
The Winter peak period begins October 1 and extends through May 31.
Historically the MRO, RFC, SERC, and SPP regional boundaries were altered as utilities changed reliability organizations. The historical data series for these regions have not been adjusted. Instead, the Balance of Eastern Region category was introduced to provide a consistent trend of the Eastern interconnection.
ECAR, MAAC, and MAIN dissolved at the end of 2005. Many of the former utility members joined RFC. Reliability First Corporation (RFC) came into existence on January 1, 2006. RFC submitted a consolidated filing covering the historical NERC regions of ECAR, MAAC, and MAIN.
Source: U.S. Energy Information Administration, Form EIA-411, "Coordinated Bulk Power Supply and Demand Program Report."