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Transmission Facility Ratings

Presentation to theReliability Committee

June 14, 2005

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Today’s Agenda Review and Vote:

New Planning Procedure No. 7 (PP-7) - Including Appendices A and C

Revised Operating Procedure No. 16

Supporting Materials: ISO Rating Collaboration Req’ts Report

- basis for new PP and some OP16 changes SDTF Ambient Temperatures and Wind

Velocities Report - documents “benchmark” values of PP-7

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April RC Meeting Recap Why have rating procedures ? RTO Transmission Operating Agreement

• Section 3.06(a)(v): “Each Participant Transmission Owner shall collaborate with the ISO with respect to:1) the development of Rating Procedures2) the establishment of ratings …”

NERC Reliability Std (FAC-004-0/FAC-008-1)

• The Transmission Owner and Generator Owner shall each document its methodology used for developing Facility Ratings…

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April RC Meeting Recap Meeting the New Requirements… New Planning Procedure No. 7 (PP-7)

• “Best Practices” approach to rating procedures and ISO/SDTF review of NX-9 rating data

• Roles/responsibilities of SDTF and ISO in each• CRPs rewritten as “Best Practices”, attached as

appendices and maintained by SDTF• Provide for “Accepted Alternative Rating

Practices”

Where are we now:• RC vote “to recommend support”

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April RC Meeting Recap Meeting the New Requirements… Modifications to OP-16

• Enforce existing requirements• Involve ISO (and SDTF) in establishing ratings• Meet NERC Reliability Standard FAC-009-1,

Establish and Communicate Facility Ratings

Where are we now:• RC vote “to recommend support”

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Since AprilAddressed RC Comments on PP-7:

• References, add NERC Reliability Standard FAC-008-1

• Section 1.4, reworded ISO Responsibilities• Section 1.6 (new), addressed static and dynamic

ratings• Attachment 1 (new), provided repository of

“Accepted Alternative Rating Practices”• Appendix A, prepared report documenting

temperature statistics and wind velocities, use of a single ambient temperature for all NE, and choice of Hartford data as being representative of all NE

• Appendix C, clarified that methodology applies to both underground and submarine cables

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Since April NERC Reliability Standards:

• Reviewed PP-7 for conformance with FAC-008-1, Facility Ratings Methodology (will replace FAC-004-0)

• Section 2.5, revised to clarify actions, responsibilities and timelines

Eliminated Duplicative Requirements• Refers to OP16 for periods for which Summer and

Winter ratings apply• Refers to OP19 for time durations to be used in

calculating and applying Short- and Long-Time Emergency ratings

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Ambient Temperatures and Wind Velocities Report

Documents Ambient Temps and Wind Used Reaffirms Established Ambient Temperatures

•1975-2004 vs. 1905-1970 Hartford area data: same result

•Hartford area similar to 1975-2004 average of 8 locations

Data provides no basis for carving NE into well-defined temperature zones

•Largest temperature differences up to 3 to 4 °C

•Affect 115kV line ratings by <2%; 345kV line ratings by <4%

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PP-7 Implementation Schedule

Thru Nov ‘05 Dec ‘05 Jan ‘06 Feb ‘06 Mar ‘06 Apr ‘06 May ‘06

NERCFAC-008-1

Compliance DateNPCC Compliance

Audit expected

Dec 1 Dec 15 Jan 15 Mar 15 May 15

Complete PP-7

Appendices

PP-7 Appendices Approved and Posted

ISO InitiatesRequest forMP Rating

Methodologies[2.5.1]

MP Responses Due: Methodologies Inputs/Assumptions Differences from Best Practices Schedule to Conform Or Justification for Practice [2.5.5 thru 2.5.7]

SDTFRecommendations

To ISO[2.5.5]

ISO Reviews MPResponses, Solicits

SDTF Advice[2.5.5, 2.5.7]

ISO Acts onRecommendations: Approve and Record Accepted Alternative Rating Practices Initiate Disagreement Discussions [2.5.6]

60 days