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Path Rating Catalog 2013 - Western Electricity Coordinating Council

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

III-15. TotBeast with Hemingway-<br />

Boardman 500 kV<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 />

Southwest Idaho and Eastern Oregon/Washington and Northern Idaho<br />

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

Line<br />

Metered End<br />

Boardman - Hemingway 500 kV<br />

Boardman<br />

Summer Lake - Hemingway 500 kV<br />

Hemingway<br />

Brownlee-Boise Bench #1 230 kV<br />

Brownlee<br />

Brownlee-Boise Bench #2 230 kV<br />

Brownlee<br />

Brownlee-Boise Bench #3 230 kV<br />

Brownlee<br />

Brownlee-Horse Flat #4 230 kV<br />

Brownlee<br />

Brownlee-Ontario 230kV<br />

Brownlee<br />

Oxbow-Starkey 138kV<br />

Oxbow<br />

Quartz-Ontario 138kV<br />

Quartz<br />

West to East: 3515 MW<br />

Some of actual flows on Brownlee East (<strong>Path</strong> 55), Hemingway - Summer<br />

Lake 500 kV (<strong>Path</strong> 75), and the Hemingway – Boardman 500 kV line.<br />

TotBeast is limited by Idaho-Northwest (<strong>Path</strong> 14) constraints. Thermal<br />

overloads on the Imnaha-Lolo section of the Oxbow-Lolo 230 kV line and/or<br />

the Hells Canyon-Brownlee 230 kV line for the N-1 loss of the Hemingway-<br />

Boardman 500 kV line.<br />

This is an expanded version of the Brownlee East (<strong>Path</strong> 55) that now also<br />

includes Hemingway-Summer Lake (<strong>Path</strong> 75), and the Hemingway-<br />

Boardman 500 kV line (included in Idaho-Northwest (<strong>Path</strong> 14) in the West to<br />

East direction.<br />

The 3515 MW west to east transfer rating on TotBeast was studied with high<br />

imports on Idaho-Northwest (<strong>Path</strong> 14) with the Hemingway-Boardman<br />

500 kV line and on the Hemingway-Summer Lake 500kV line (<strong>Path</strong> 75), also<br />

included in Idaho-Northwest (<strong>Path</strong> 14), simultaneous with high flows on<br />

Brownlee East (<strong>Path</strong> 55), high T E Roach Complex / Elkhorn Wind<br />

generation at peak summer load conditions. This generally coincides with<br />

high hydro conditions in the Northwest with low to moderate eastern thermal<br />

resources.<br />

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

At high flows east on Brownlee East (<strong>Path</strong> 55), the loss of two Brownlee-<br />

Boise Bench 230kV lines requires overload mitigation measure of bypassing<br />

½ series compensation in the remaining two Brownlee-Boise Bench 230kV<br />

lines.<br />

PART VI Item 1-247

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