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<br />I <br />I <br />I <br />I <br />1 <br />I <br />1 <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br /> <br />65 <br /> <br />STATE OF THE WSCC <br />INTERCONNECTED BULK POWER SYSTEM <br />THROUGH 1991 <br /> <br />INTRODUCTION <br /> <br />This report provides a joint operating/planning reliability assessment <br />of the WSCC interconnected bulk power system. Information submitted by <br />Operating Practices Subcommittee (OPS) and Technical Studies Subcommittee <br />(TSS) Members provide the basis for the report's cDntents. <br /> <br />1981 SYSTEM OPERATION <br />PEAK AND ENERGY LOAD REQUIREMENTS <br /> <br />The WSCC 1981 non-coincidental peak demand of 83,966 MW which occurred <br />in August was 3.5 percent greater than the 1980 peak demand of 81,129 MW <br />which occurred in July and 1.3 percent less than that forecasted for August. <br />Installed generating capacity at the time of the summer peak was 119,368 MW. <br /> <br />The 1981 total energy load reported'for the WSCC region (506,807 GWH) <br />was 4.5 percent greater than the 1980 total energy load (485,159 GWH). The <br />1981 energy load for the region was 2.8 percent below that forecasted for <br />the year. Conservation efforts, price elasticity, load management, <br />depressed economic conditions and generally mild temperatures experienced <br />during 1981 are factors which contributed to a lower energy load than that <br />forecasted for the year. <br /> <br />HYDRO CONDITIONS AND FUEL AVAILABILITY <br /> <br />Hydro conditions and fuel supplies were adequate within the WSCC <br />region during 1981. <br /> <br />In the Pacific Northwest, the January-July 1981 Columbia Basin runoff <br />amounted to 103.5 million acre-feet (MAF). or 94 percent of the 15-year <br />average. Surplus hydro was declared available on May 23 and delivery <br />outside the Pacific Northwest began on that day. By July 19, reservoirs had <br />refilled to the 98 percent goal, allowing surplus hydro to continue to be <br />available until August 31. These surpluses were augmented by available <br />thermal energy and Canadian hydro. Northern California also experienced <br />large amounts of precipitation and enjoyed a good hydro year. <br /> <br />During 1981 Member Systems in the Southwest area were able to utilize <br />significant amounts of natural gas. For example, in addition to purchasing <br />energy from the Pacific Northwest and Southwest, SCE was able to <br />significantly reduce its oil requirements relative to those of 1980. Over <br />244 billion cubic feet of natural gas were burned by SCE during 1981 <br />compared to approximately 198 billion cubic feet in 1980. Natural gas <br />