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Path Rating Catalog 2013 - Western Electricity Coordinating Council

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Revised January <strong>2013</strong><br />

System<br />

Conditions:<br />

Study Criteria:<br />

Remedial<br />

Actions<br />

Required:<br />

Formal<br />

Operating<br />

Procedure:<br />

The east to west transfer rating was studied with light load conditions in<br />

Idaho with heavy eastern thermal resources, and moderate generation on the<br />

remaining hydro plants in Idaho. Studies were performed with both north to<br />

south and south to north on the PACI and near maximum transfers on parallel<br />

paths; i.e., transfers to Northwest and Arizona to California.<br />

The west to east transfer rating was studied with high hydro conditions in the<br />

Northwest and heavy summer load conditions.<br />

NERC/WECC Reliability Criteria for Transmission System Planning.<br />

Remedial action schemes are required to achieve the 2400 MW east to west<br />

transfer capability on the Idaho-Northwest path under which this path is<br />

operated. An outage of either the Midpoint-Hemingway& Hemingway-<br />

Summer Lake 500 kV line requires Jim Bridger unit(s) tripping. Jim Bridger<br />

unit(s) tripping is only needed for the outages for East-West transfers.<br />

No Bridger unit tripping is required for West-East transfers. Reactive<br />

switching at Meridian is required for double Palo Verde unit outage.<br />

Under certain generation and load conditions, 1200 MW Idaho to Northwest<br />

transfers, simultaneous with heavy Northwest to California transfers, may<br />

cause overloading of the Hemmingway-Summer Lake line. During these<br />

conditions, one-half of the Burns series capacitors can be bypassed to reduce<br />

Midpoint-Summer Lake loading but it results in reduced Bridger West/Borah<br />

capacity.<br />

Allocation:<br />

Interaction<br />

w/Other<br />

Transfer <strong>Path</strong>s:<br />

Contact Person:<br />

The transfer capability of the path is allocated among the interconnections as<br />

follows:<br />

• 1500 MW East to West<br />

1187 MW PacifiCorp - IPC Interconnection<br />

• 550 MW West to East<br />

0-110 MW PacifiCorp – IPC Interconnection<br />

Larry Frick<br />

PacifiCorp, Transmission Planning<br />

Lloyd Center Room 1800<br />

825 NE Multnomah<br />

Portland, OR 97232<br />

(503) 813-6236<br />

(503) 813-6508 - fax<br />

Larry.Frick@PacifiCorp.com<br />

PART VI Item 1-190

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