Path Rating Catalog 2013 - Western Electricity Coordinating Council

10. West of Colstrip
Revised January 2013
Accepted Rating
Existing Rating
Other
Location:
Definition:
Transfer Limit:
Critical
Disturbance
that limits the
transfer
capability:
When:
System
Conditions:
Study Criteria:
Remedial
Actions
Required:
Formal
Operating
Procedure:
Allocation:
Southeastern Montana
The West of Colstrip path consists of the following transmission lines:
Line
Metered End
Colstrip-Broadview 500 kV lines #1 & #2 Colstrip
Colstrip-Hardin 230 kV
Colstrip
Colstrip-Hardin 115 kV
Colstrip
East to West: 2598 MW
Since this path was constructed to integrate the Colstrip generation project
into the Montana system, no effort has been made to determine the west to
east capacity.
The path capacity is based on studies done in 1980 for the Colstrip
participants. This study result must be regarded as only approximate, since
the transmission system model used in the study did not include significant
changes which have occurred since 1980. These include:
1. The insertion of the Crossover bus in the Colstrip-Billings 230 kV line
connecting this NWMT line to the Miles City-Yellowtail 230 kV Western
Area Power Administration (WAPA) line at the location where the two
lines intersect.
2. The addition of the Miles City back-to-back DC tie.
3. The insertion of the Hardin bus in the Colstrip-Crossover 230 kV line.
4. The addition of the Montana 1 power station on the 115 kV line between
Colstrip and the Nichols pumping station.
5. The 230/115 kV transformer at Hardin.
6. Closing through the 115 kV line between Colstrip and Hardin.
7. A load tap has been placed between Crossover and Billings to serve the
Huntley area.
It is not likely that any of these changes has a significant impact on the
capacity of this path.
None
None
PART VI Item 1-28