6.2 : Electricity Generation, Transmission, and Distribution




6.2.9 2009 Peak Load and Capacity Margin, Summer and Winter by NERC Region (MW)
Summer (1) Winter (2)
NERC Region Peak Load Capacity Margin Peak Load Capacity Margin
TRE 63,518 16.7% 56,191 19.1%
FRCC 46,550 6.0% 53,022 2.0%
MRO (U.S.) 37,963 24.6% 35,351 26.8%
NPCC (U.S.) 55,944 29.1% 44,864 43.2%
RFC 161,241 25.2% 143,827 33.3%
SERC 191,032 24.6% 193,135 26.2%
SPP 41,465 16.4% 32,863 34.6%
WECC 128,245 19.4% 109,565 29.6%
U.S. TOTAL 725,958 22.2% 668,818 28.5%
Note(s): 1) Summer Demand includes the months of June, July, August, and September. 2) Winter Demand includes December of the previous year and January-March of the current year. 3) Capacity Margin is the amount of unused available capability of an electric power system at peak load as a percentage of net capacity resources. Net 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.









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