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Path Rating Catalog 2013 - Western Electricity Coordinating Council

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17. Borah West<br />

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

Accepted <strong>Rating</strong><br />

Existing <strong>Rating</strong><br />

Other<br />

Location:<br />

Definition:<br />

Transfer Limit:<br />

Critical<br />

Disturbance<br />

that limits the<br />

transfer<br />

capability:<br />

When:<br />

System<br />

Conditions:<br />

Study Criteria:<br />

Remedial<br />

Actions<br />

Required:<br />

Formal<br />

Operating<br />

Procedure:<br />

Allocation:<br />

Southeast Idaho<br />

Sum of the flows on the following lines:<br />

Line<br />

Kinport-Midpoint 345 kV<br />

Borah-Adelaide-Midpoint #1 345 kV<br />

Borah-Adelaide #2 345 kV<br />

Borah-Hunt 230 kV<br />

AmFalls-Plst Vly-Minidoka 138 kV<br />

Metered End<br />

Kinport<br />

Borah<br />

Borah<br />

Borah<br />

American Falls<br />

East to West: 2557 MW<br />

West to East: 1600 MW (“Other” <strong>Rating</strong>: <strong>Rating</strong> established following<br />

NERC MOD-029-1a_R2.2 requirement)<br />

The Borah West transfer capacity is limited by the double line (N-2) loss of<br />

the Kinport-Midpoint 345 kV and the Borah-Adelaide-Midpoint #1 345 kV<br />

lines.<br />

The 2557 MW Borah West rating was established in the Phase II<br />

comprehensive progress report, which was issued September 10, 2002. The<br />

Borah West Uprate project was granted Phase III status on March 24, 2003.<br />

The Borah West Uprate project was placed in-service in June 2007.<br />

The Borah West transfer rating was determined with simultaneous heavy<br />

transfers on series path (<strong>Path</strong> C south to north, and Bridger West) consistent<br />

with the transfers of eastern thermal resources to the west.<br />

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

The loss of two Borah West lines simultaneously or one element initially outof-service<br />

and loss of another line could initiate one or more of the following<br />

Remedial Actions:<br />

Tripping of one/two Jim Bridger unit(s).<br />

Bypassing either or both Midpoint and/or Burns 500 kV<br />

Series Capacitors.<br />

Insertion of one or more of the Kinport, Borah, and Midpoint 345 kV<br />

Shunt Capacitors<br />

For PDCI south to north operation, a nomogram exists for flows on the PDCI,<br />

COI, Borah West and available load dropping in the Northwest. California<br />

ISO T-122 (West of Borah versus <strong>Path</strong> 15 nomogram).<br />

Idaho Power Company (IPC) owns the Borah West transfer path and capacity<br />

is owned by Idaho Power Company (IPC). IPC has long term agreements to<br />

provide transmission services on this path to PacifiCorp for up to 1600 MW.<br />

PART VI Item 1-46

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