6.2 : Electricity Generation, Transmission, and Distribution




6.2.2 Net Internal Demand, Capacity Resources, and Capacity Margins in the Contiguous United States (GW)
Net Internal Capacity Capacity
Demand (1) Resources (2) Margin (3)
1995 589.9 727.5 18.9%
1996 602.4 730.4 17.5%
1997 618.4 737.9 16.2%
1998 638.1 744.7 14.3%
1999 653.9 765.7 14.6%
2000 680.9 808.1 15.7%
2001 674.8 789.0 14.5%
2002 696.4 833.4 16.4%
2003 696.8 856.1 18.6%
2004 692.9 875.9 20.9%
2005 746.5 882.1 15.4%
2006 776.5 891.2 12.9%
2007 766.8 914.4 16.1%
2008 744.2 909.5 18.2%
2009 713.1 916.4 22.2%
2010 747.8 924.9 19.1%
2011 730.4 939.4 22.2%
2012 745.4 957.2 22.1%
2013 757.5 970.1 21.9%
2014 768.5 977.8 21.4%
2015 778.5 980.3 20.6%
Note(s): 1) Net internal demand represents 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. Direct control load management: Customer demand that can be interrupted at the time of the seasonal peak by direct control of the system operator by interrupting power supply to individual appliances or equipment on customer premises. This type of control usually reduces the demand of residential customers. Interruptible demand: Customer demand that can be interrupted (through contractual agreement) during peak loads by direct control of the system operator or by the customer at direct request of the system operator. This type of control usually reduces the demand of large-volume commercial and industrial consumers. 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.









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