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I I I I I I I I I I I I I I I I 1 I I 73 Principal transmission lines (over 100 circuit miles) which are projected to be placed in service during 1982 are tabulated below: Ben Lomond-Borah Emery-Camp Williams Wyodak-Dave Johnston San Juan-McKinley-Springerville Palo Verde-Devers Operating Volta~e Level (kV) 345 345 230 345 500 Circuit Miles Area Terminal Names NWPP NWPP NWPP AZ-NM CA-NV 133 124 128 197 238 SYS1EM OEVELOPMEN1S 1983-1991 FACILITY ADDITIONS AND LOAD GROWTH The generation additions planned within WSCC through 1991 continue to reflect a heavy reliance on coal and nuclear resources. Coal-fired and nuclear generating units will provide 49.2 percent (22,485 MW) and 26.9 percent (12,300 MW), respectively, of the new generating capability for the WSCC region. These coal and nuclear resources are planned to meet future capacity and energy requirements and enable conservation of, and reduce dependency on, oil and natural gas. Transmission additions planned through 1991 reflect significant increases in the bulk transmission voltage levels of 500 kV, 345 and 230 kV. The net bulk power transmission additions planned in the WSCC region through 1991 (17,697 circuit miles) include 7,295 miles (41.2%) of 500 kV, 5,118 miles (29.0%) of 230 kV and 4,104 miles (23.2%) of 345 kV. High voltage DC (HVDC) transmission (1,000 kV) is also planned, totaling 2.099 circuit miles. HVDC circuit mile additions represent 11.9% of WSCC's significant transmission additions planned through 1991. Other net changes in the planned transmission additions (-5.3%) primarily reflect conversion of existing 800 kV DC and 287 kV AC lines to higher voltage levels. The average annual compound peak load growth for the region from 1981 through 1991 is projected to be 3.4 percent. 1his anticipated load growth rate represents a reduction from the 4.0 percent load growth rate projected in 1981 for the 1980-1990 ten-year period. Total energy loads are anticipated to increase at an average annual compound growth rate of 3.5 percent through 1991, representin9 a reduction from the 4.3 percent energy growth rate projected in 1981. These reduced growth rates can be attributed to projected conservation, load management, price elasticity and depressed economic conditions. ADEQUACY OF RESERVES AND ENERGY SUPPLY All areas within the WSCC region are projecting to have adequate reserves and energy supplies through 1991, due largely to the fact that