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I I I I I I I r r f I I I I I I I I I 1 INTRODUCTION Western Systems Coordinating Council (WSCC), organized in August of 1967, provides the coordination which is essential for operating and planning a reliable and adequate electric power system for the western part of the continental United States and Canada. This annual report provides information concerning the reliability and adequacy of the planned WSCC interconnected bulk power system, and includes: . historical load and resource information . projected peak and energy load growth . planned generation and transmission facilities . estimated energy production by resource type . projected fuel requirements . an appraisal of the existing and planned interconnected bulk power system The ten-year (19BZ-1991) coordinated plans of the WSCC organizations are as of January 1, 1982. WSCC is a voluntary organization open to all electric utility organizations within the WSCC region. Non-voting Affiliate Member status is available to electric utility organizations within the WSCC region which have less than 100 MW of generation and do not operate transmission having a voltage of 230 kV or higher. The following five electric utility organizations became WSCC Member Systems during 1981: The City of Anaheim, Basin Electric Power Cooperative, Deseret Generation and Transmission Cooperative, Modesto Irrigation District, and the City of Riverside. WSCC now consists of 53 Member Systems and 8 Affiliate Members. The electric utilities comprising the WSCC Member Systems include 19 investor-owned utilities, 11 municipal utilities, 16 public power systems, 4 Federal agencies and 3 Canadian systems. The Affiliate Members represent 6 municipal utilities and 2 public power systems. These utility systems provide substantially all of the electric service in the states of Washington, Oregon, California, Arizona, New Mexico, Nevada, Utah, Idaho, Montana, Wyoming and Colorado, as well as portions of South Dakota, Nebraska, Texas and the Canadian Provinces of British Columbia and Alberta. The WSCC Member Systems and Affiliate Members are listed on page Z. The WSCC region enCompasses approximately 1.8 million square miles, representing a service area equivalent to more than one-half of the contiguous land area of the United States. WSCC is the largest, geographically, of the nine regional councils of the North American Electric Reliability Council (NERC), and its members provide electric service to approximately 44 million people. During 1981 WSCC's non- coincidental peak demand of 83,966 MW occurred in August. The WSCC service area is significantly characterized by extremes in population densities, extremes in electric load densities, and long distances between load centers and power generating stations. These extremes produce a wide range of problems in providing reliable and adequate electric service within such a vast area. The WSCC region consists of four natural areas which result from concentrations of natural resources and economic influences being reflected in the geographical location and growth of population and industry. These areas are identified as: the Northwest Power Pool Area, the Rocky Mountain Power Area, the Arizona-New Mexico Power Area and the California-Nevada Power Area.