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<br />~nLO lour suoreg10ns ror
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<br />~~;;:?Jj~oordinated power system planning.
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<br />These regions are:
<br />
<br />1.
<br />
<br />The Northwest Power Pool which primarily
<br />
<br />encompasses utilities in the States of
<br />
<br />Washington, Oregon, Idaho, Montana,
<br />
<br />U~ah and western Wyoming;
<br />
<br />2.
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<br />The Rocky Mountain Power Area which includes
<br />
<br />utilities in Colorado and eastern Wyoming;
<br />
<br />3.
<br />
<br />The New Mexico Power Pool which covers only
<br />
<br />the State of New Mexico;
<br />
<br />4.
<br />
<br />The Pacific Southwest Power Area which
<br />
<br />enpompasses utilities in AriZona, Nevada
<br />
<br />and California.
<br />
<br />The bulk power supply network interconnects
<br />
<br />the utiliti~s in all of these areas. The electric power
<br />
<br />(megawatt) transfer capability of a transmission system can
<br />
<br />only be determined by complex network load flow studies and
<br />
<br />system stability analyses and is valid only for the conditions
<br />
<br />specified in the study.
<br />
<br />Bulk power system electric power
<br />
<br />(megawatt) transfer capabilities apply to only one specific
<br />
<br />set of system load and generating conditions, and general
<br />
<br />statements df capability require many studies.
<br />
<br />Determination
<br />
<br />of energy tnansfer (gigawatthour) capability adds the
<br />
<br />element of time, thereby requiring that average or nominal
<br />
<br />capabilities be determined.
<br />
<br />This average or nominal capacity
<br />
<br />cOntrasts w~th peak power transfer capability where maximums
<br />
<br />are determin,ed.
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