Table 8.8.B. Summer Net Internal Demand, Capacity Resources, and Capacity Margins
by North American Electric Reliability Corporation Assessment Area, 2013 Actual, 2014-2018 Projected
 

Net Internal Demand (Megawatts) -- Summer
  Eastern Interconnection ERCOT Western Interconnection All Interconnections
Period FRCC NPCC Balance of Eastern Region MAPP MISO PJM SERC SPP TRE WECC Contiguous U.S.
Projected 2014 43,579 58,640 449,894 4,932 123,828 145,447 127,262 48,426 67,140 130,564 749,817
Projected 2015 44,442 59,570 459,619 5,276 125,345 150,068 129,243 49,687 68,097 132,301 764,029
Projected 2016 45,259 60,104 464,908 5,406 126,475 151,793 130,850 50,384 68,954 133,768 772,994
Projected 2017 45,859 60,605 469,373 5,594 127,598 153,077 132,161 50,944 69,889 135,303 781,029
Projected 2018 46,479 61,053 474,178 5,712 128,679 154,498 133,766 51,523 70,942 136,759 789,412

 

Capacity Resources (Megawatts) -- Summer
  Eastern Interconnection ERCOT Western Interconnection All Interconnections
Period FRCC NPCC Balance of Eastern Region MAPP MISO PJM SERC SPP TRE WECC Contiguous U.S.
Projected 2014 52,380 67,835 534,496 6,283 140,150 168,351 155,055 64,657 74,834 162,042 891,586
Projected 2015 52,685 69,248 541,840 6,407 137,803 180,448 153,949 63,233 75,756 164,201 903,731
Projected 2016 52,780 67,327 542,289 6,504 139,952 178,095 153,807 63,932 76,561 164,566 903,522
Projected 2017 52,793 67,327 539,647 6,511 139,495 173,502 156,205 63,935 77,443 164,308 901,517
Projected 2018 53,939 67,331 541,313 6,501 139,111 173,526 158,108 64,068 76,843 164,603 904,028

 

Capacity Margin (Percent) -- Summer
  Eastern Interconnection ERCOT Western Interconnection All Interconnections
Period FRCC NPCC Balance of Eastern Region MAPP MISO PJM SERC SPP TRE WECC Contiguous U.S.
Projected 2014 16.8% 13.6% 15.8% 21.5% 11.6% 13.6% 17.9% 25.1% 10.3% 19.4% 15.9%
Projected 2015 15.6% 14.0% 15.2% 17.7% 9.0% 16.8% 16.0% 21.4% 10.1% 19.4% 15.5%
Projected 2016 14.2% 10.7% 14.3% 16.9% 9.6% 14.8% 14.9% 21.2% 9.9% 18.7% 14.4%
Projected 2017 13.1% 10.0% 13.0% 14.1% 8.5% 11.8% 15.4% 20.3% 9.8% 17.7% 13.4%
Projected 2018 13.8% 9.3% 12.4% 12.1% 7.5% 11.0% 15.4% 19.6% 7.7% 16.9% 12.7%

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 Summer peak period begins on June 1 and extends through September 30.
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."