20180410PAC to Staff UT Attach Appendix A - Path Definitions.pdf

Appendix A

Path Definitions

1.0 Path Definitions
Path definitions are provided in this section, with an asterisk ‘*’ denoting metering points.

1.1. Path 36: TOT 3 (Location: border between northeast Colorado and
southeast Wyoming)

The TOT 3 transmission Path #36 is defined as the sum of flow on the following lines:
 Archer*– Ault 230 kV
 Laramie River*– Ault 345 kV
 Laramie River* – Story 345 kV
 Cheyenne* – Owl Creek 115 kV
 Sidney* – Sterling 115 kV
 Sidney* – Spring Canyon 230 kV
 Cheyenne* – Ault 230 kV

The current path rating is 1680 MW north to south.

1.2. Path 37: TOT 4A (Location: southwest Wyoming)

The TOT 4A transmission Path #37 is defined as the sum of flow on the following lines:

 Riverton* - Wyopo 230 kV
 Standpipe* - Platte 230kV
 Mustang* - Spence 230 kV

The current path rating is 1025 MW northeast to southwest with Great Divide normal open point.

1.3. New: Aeolus West replaces TOT 4A (Location: southwest Wyoming)

The new Aeolus West transmission is defined as the sum of flow on the following lines:

 Aeolus* - Anticline 500 kV
 Riverton* - Wyopo 230 kV
 Platte* - Latham 230kV
 Mustang* - Bridger 230 kV

The path rating is 2670 MW East to West based on full Energy Gateway project

1.4. Path 38: TOT 4B (Location: northwest Wyoming)

The TOT 4B transmission Path #38 is defined as the sum of flows on the following lines:

 Buffalo – Carr Draw* 230 kV
 Tongue River – Sheridan* 230 kV
 Spence* – Thermopolis 230 kV
 Alcova* – Raderville 115 kV
 Casper* – Midwest 230 kV
 Riverton* – Thermopolis 230 kV
 Riverton 230 kV* – Riverton 115 kV transformers
 Subtract PreCorp load at Sheridan (approximately 4 MW in base case)

The current path rating is 880 MW southeast to northwest.

1.5. Path 30: TOT 1A (Location: northwest Colorado)

The TOT 1A transmission Path #30 is defined as the sum of flows on the following lines:

 Craig* - Bonanza 345 kV
 Hayden* - Artesia 138 kV
 Meeker - Rangely 138 kV

The current path rating is 650 MW east to west.

1.6. Path 19: Bridger West (Location: border between southeast Idaho and southwest
Wyoming)

The Bridger West transmission Path #19 is defined as the sum of the flows on the following
lines:

Jim Bridger* - Threemile Knoll 345 kV
Jim Bridger* - Populus 345 kV #1
Jim Bridger* - Populus 345 kV #2

The current path rating is 2400 MW east to west.