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Path Rating Catalog 2013 - Western Electricity Coordinating Council

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Revised January<br />

<strong>2013</strong><br />

III-14. Borah West Upgrade (Gateway<br />

West)<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 />

Southeast Idaho<br />

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

Line<br />

Borah-Midpoint 500 kV<br />

Populus-Cedar Hill 500 kV<br />

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

Borah-Adelaide-Midpoint #2 345 kV<br />

Borah-Hunt 230 kV<br />

American Falls-Raft River-Minidoka 138 kV<br />

Metered End<br />

Borah<br />

Populus<br />

Borah<br />

Borah<br />

Borah<br />

American Falls<br />

East to West: 4450 MW (Gateway West Stage One)<br />

West to East: Not rated<br />

With the Gateway West Project (Stage 1), the Borah West 4450 MW transfer<br />

capacity is limited by the (N-1) loss of the Populus-Cedar Hill-Hemingway<br />

500 kV line (5% post-transient reactive margin) and the double line (N-2)<br />

loss of the Borah-Midpoint 500 kV and the Borah-Adelaide-Midpoint #1 345<br />

kV lines (thermal - Borah-Adelaide #2 345 kV line).<br />

The increase in transfer rating for the Borah West path entered Phase 2 on<br />

February 6, 2009 as part of the Gateway West Project, and achieved Phase 3<br />

status on July 21, 2011 with an Accepted <strong>Rating</strong> of 4450 MW.<br />

The Borah West transfer rating with the Gateway West Project (Stage 1) was<br />

determined with simultaneous heavy transfers on series path (<strong>Path</strong> C south to<br />

north, Bridger West, and Midpoint West) consistent with the transfers of<br />

eastern thermal and alternative renewable resources to the west.<br />

NERC/WECC Planning Standards<br />

Remedial action schemes (RAS) will be required to achieve the increase<br />

Borah West rating and will initiate one or more of the following Remedial<br />

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 />

Insertion of one or more of the Midpoint and Hemingway 500 kV<br />

Shunt Capacitors.<br />

None.<br />

PART VI Item 1-244

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