Path Rating Catalog 2013 - Western Electricity Coordinating Council

• Serve as a complete list of all path information, or
• Enforce, support or implement any WECC Policy.
Contents
This Path Rating Catalog should include:
• All significant paths (i.e., Loop Flow Qualified paths, OTC Policy Group paths and
constrained paths),
• A compilation of best available path rating information consisting of accepted ratings, Phases
2 and 3 ratings, existing ratings and other ratings,
• The names of contact persons of the appropriate WECC members (single point of contact),
• “Maximum Path Transfer Capabilities,” not “First Contingency Incremental Transfer
Capabilities” and reflects technical transfer capabilities based on technical limits from system
planning studies.
Path Descriptions
The minimum specific content of each path description should include:
• A specific identification of the facilities that make up the transmission path, including the
location of applicable metering points.
• A discussion of the non-simultaneous path rating and the conditions used to achieve the path
rating,
• Any necessary Remedial Action Schemes to achieve the path rating,
• An identification of interactions or relationships with other paths including applicable
nomograms (Information should be provided on where a “current” nomogram can be
located),
• Ownership and allocation or rights on the path,
• Date of submittal or update and contact person.
Additional explanatory information supporting transfer path ratings is welcome such as
identification of internal paths that are considered to have no significant regional impact.
Document Update Policy
Changes to an “accepted” or “existing” path rating must follow the WECC Project Coordination
and Path Rating Processes (WECC Procedures). Minor changes to a path rating (such as moving
a metering location) should be submitted as part of the 60-day Expedited Process defined in
Section 3.3 (pages 41-42) of the WECC Procedures (assuming no comments require reissuing a
study report). Changes to a path with an “other” path rating do not need to follow the WECC
Procedures; however, the path will retain the “other” status. Changes to an “accepted” or
“existing” path rating that do not follow the WECC procedures will be reclassified to “other”
status. Although updated entries to the WECC Path Rating Catalog may be submitted to the
WECC staff at any time, the catalog will be published once annually. Each path rating narrative
shall indicate the date it was added to the catalog. When a path rating narrative is revised, the
word “Revised” will be added followed by the revision date. Paths can be deleted if superseded
by another path with newly defined accepted rating or with notification and explanation to TSS.
Prior to a member system submitting additions or changes to the WECC Path Rating Catalog to
WECC, it shall notify and coordinate these additions and/or changes with other WECC members
PART VI
Item 1- ii