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The Utah/western Colorado area of the Rocky Mountain Region has adequate coal and water resources to support additional thermal generation plants beyond those already in service. Also within the region are several sites suitable for large-sized hydroelectric pumped-storage projects for purposes of supplying peaking power. The close proximity of these types of electric generating facilities is desirable in providing offpeak energy during the pumping cycle for the pumped-storage units. Considering that the potential capacity of each type of generation is in the 500 to 1,000 (two units) MW range per site and would require major extra-high-voltage (EHV) transmission developments, it was logical to initiate a coordinated long-range transmission planning study. Although much of the projected new generation is planned to serve local area load growth, it still would be necessary to construct an EHV grid to interconnect with other existing systems for system stability and reliability. The EHV grid would also provide transfer capability to allow efficient use of surplus energy, provide emergency assistance among utilities, transmit installed reserves, and accommodate the loopflows that circulate within the Western Systems Coordinating Council (WSCC) system.


United States Department of Energy Western Area Power Administration general publication. SuDocs call # E 6.2:UT 1.