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Operating Transfer Capability Policy Committee (OTCPC)

Western Electricity Coordinating Council MIC Meeting – Liaison Report Oct 24, 2006 – Salt Lake City. Operating Transfer Capability Policy Committee (OTCPC). Contents. Who, What, When, and Why of the OTCPC Performance Review (COI) Study Results Recent Discussion Items MIC Discussion.

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Operating Transfer Capability Policy Committee (OTCPC)

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  1. Western Electricity Coordinating CouncilMIC Meeting – Liaison ReportOct 24, 2006 – Salt Lake City Operating Transfer Capability Policy Committee (OTCPC)

  2. Contents • Who, What, When, and Why of the OTCPC • Performance Review (COI) • Study Results • Recent Discussion Items • MIC Discussion MIC Liaison Report

  3. Who, What, When, Why of the OTCPC1/4 • Purpose: • Formed by Board 8/11/98 in response to 7/2/96, 8/10/96 – lessons learned, won’t operate at unstudied OTC level • Provide coordinated, standard development, determination of OTCs throughout WECC • Forum for communications, assure consistent study methodologies • Provide highest OTCs consistent with reliable operation of WECC grid • Duties: • Approve/disapprove seasonal OTC limits studied by the four Subregional Study Groups: NW Operational SG, Rocky Mtn SG, SW Area SG, Ops Study Subcom • Determine which transmission paths are to be studied • Ensure that the subregional studies are held to the same standards, level of work required and study methodologies • Facilitate OTC dispute resolution • Recommend policy positions to the Board (e.g. from disturbance reports – Open Loop Operation, PSCO – “perceived transmission constraints”) MIC Liaison Report

  4. Who, What, When, Why of the OTCPC2/4 • Functions: • Review and approve Subregional seasonal study plans and technical simulation results. • Develop policies and procedures addressing seasonal OTC’s • CMOPS OPRG reviews/approves operating procedures for each season • Establish work groups such as Subregional Study Groups and Operating Procedures Review Group. • CA-NX: Mark Willis (SMUD), Rocky Mtn: Brent Vossler (WACM), Northwest: John Phillips (PSE), AZ-NM: Tom Isham (APS) • Address OTC seams issues between subregions. • Provide technical guidance. • For Further OTCPC Consideration: • Need for OTC studies beyond most critical N-1 or N-2 outages? • What combinations of line outages, generation patterns or outages, reserves topography or load conditions require OTC reduction – FRR MIC Liaison Report

  5. Who, What, When, Why of the OTCPC3/4 • Membership: • 9 Voting Members – 3 year terms (staggered) • 3 Directors or high level management appointed by WECC Board – • Chair (Vickie VanZandt, BPA) from this group (exp 04, 2007) • Others: Dick Ferreria exp 4/07, TANC and Mike Risan, Basin Electric exp 4/08 • 6 are from OC/PC/MIC - 2 each, with a TC and TP class member • OC: Duncan Brown, Calpine exp 4/07 TC and Mike Flores, Tucson exp 4/07 TP • PCC: Hardev Juj, Seattle exp 4/07 TC and James Leigh Kendall, SMUD exp 4/08 TP • MIC: Edison Elijah, PacifiCorp exp 4/09 TC and R Buckingham, PG&E exp 4/09 TP • Standing Committee Chairs coordinate selection with OTCPC Chair and consider – in priority order: • Technical expertise • Regional diversity • Member class diversity MIC Liaison Report

  6. Who, What, When, Why of the OTCPC4/4 • Path Study Criteria (What is subject to OTCPC Review) • Annually review paths and study conditions (by Subregional Study Groups) • Comprehensive studies (Var margin, RAS compliance, Nomogram transition points) required (path owners and operators responsibility): • Actual outage and CMOPS report finds a deficiency in the operating study • Path or system changes that affect OTC by 5% or more • Study criteria or processes change impact OTC by 5% or more • A new or previously not studied (using current criteria) path is determined to have possible significant interconnection wide impact • A change in OTC for a path or a new OTC for the path is proposed • Check cases ok (worst contingencies only) if no major changes and at least one year or two like seasons studied comprehensively in last 5 years • Removal from study (but subject to confirmation every 3 years) if: • No interaction with other paths (only impacts the local area); • No more than 5% change in OTC over 2 years (in like seasons); • OTC not affected by seasonal loads and dispatch • OTCPC and Subregional Discretion (may add or remove paths outside of above criteria) MIC Liaison Report

  7. Summer 2006 Review1/6 • Critical Outage Events • RAS, 500/345-kV N-1, N-2, G-2 • OTCact vs OTCmax and Actual flow on Key Studied Paths • Path 66 • Path 26 • SCIT • PDCI • NJD MIC Liaison Report

  8. July 2006 COI Performance Review2/6 MIC Liaison Report

  9. August 2006 COI Performance Review3/6 MIC Liaison Report

  10. September 2006 COI Performance Review4/6 MIC Liaison Report

  11. Spring 2004 COI Performance Review5/6 MIC Liaison Report

  12. Spring 2004 COI Performance Review6/6 MIC Liaison Report

  13. Study Results1/4 Path Direction Rating Sum 06 Sum 05 Sum 03 • COI+NW-Sierra (66) South 4800 4800* 4800 4800 • Added generation in North CA affects Nomogram/Up to 300 MW to Sierra • PDCI-n and PDCI-s (65) South 3100 3100* 3100 3100 • PDCI converter valve replacement project completed early 2005 • Midway-Los Banos (15) North 5400 5400 5400 3950 • Path 15 Upgrade project in-service 12/2004, shifts RAS to protect for flows North of Los Banos, RAS uses balanced load and gen, only arms as needed • SCIT (All ties into So. CA) West 18,860 15,600* 14,80015,200 • 800 MW increase due to series cap replacement, added VAR support • COI+NW+PDCI (N/A) South 7900 7900 7900 7900 • North of John Day (73) South NR 7800* 7700 7700 • Schultz-Watoma addition 12/2005 * OTC studies performed MIC Liaison Report

  14. Study Results2/4 Path Direction Rating Sum 06 Sum 05 Sum 03 • Midway-Vincent (26) South 4000 4000* 4000 3000 • RAS supports OTC increases to 3400, 3700, and 4000 (SCE drops load only for flow levels above 3700 MW, gen drop used first) • Path 26 takes reductions for simultaneous interactions at COI or EOR • Brownlee East (55) East 1850 1850 1750 1750 • Addition of #2 Brownlee-Oxbow 230-kV line, 93 MVar 2004 • South of Allston (N/A) South NR 3090* 2640 2700 • Increase based on generation dispatch assumptions • West of Hatwai (6) West 4277 4065* 3960 26-800 • Sierra-Utah (32) West 440 370 370 240 • Falcon-Gonder 345-kV line addition 2004 • Bridger West (19) West 2200 2200 2200 2200 * OTC studies performed MIC Liaison Report

  15. Study Results3/4 Path Rating Sum 06 Sum 05 Sum 03 • Borah West (17) West 2307 2307 2307 2100 • Montana-NW (8) West 2200 2200* 2200 2200 • Midpt-Summer Lake (75) East 400 400 400 400 • In rating process since before 1996, Eastbound flows directly affect COI • Idaho-NW (14) East 1200 1090 1090 • Path 14 OTC limited to amount at which Path 75 flow reaches rated OTC • TOT 2A 690 690 690 650 • New procedure expanded area where load was varied • TOT 3 1605 1590 1594 1579 • Path is thermally limited, OTC varies slightly each year • OTC studies performed MIC Liaison Report

  16. Study Results4/4 Path Rating Sum 06 Sum 05 Sum 03 • Four Corners-West (22) 2325 2325 2325 • Cholla-Pinnacle Peak (50) 1200 1200 1200 1200 • These AZ-NM paths are studied summer only, thermally limited, • Southern New Mexico (47) 1048 1048 1048 1048 • Northern New Mexico (48) 1947 1947 1947 1450-1692 • Norton-Hernandez facility upgraded in 2004 • Paths 47, 48 are post-transient limited, operated at maximum OTC based on monitored system conditions and limited to studied amounts • East of River (49) 7550 7550 7550 MIC Liaison Report

  17. OTCPC – Recent Discussion Items1/2 • OTCPC Open Loop Operating Limits and Need for South to North OTCs for TOT2 • Determination of south to north operating limits for TOT2, TOT2A, B, C, under Open Loop conditions to meet G-1 criteria needed. OTCPC reviewed the need to have a South to North OTC to give a safe operating point in the event that flows go South to North. Such a study process would need PAC and Sierra-Nevada to be involved. Rocky Mountain Study Group and Northwest study will coordinate to develop a study process. • Standards of Conduct Question – Availability of Study Center Work Products • OTCPC and Regional Subgroups meeting attendees have early transmission sensitive information – Propose to post preliminary study results on WECC website at time of Regional Subgroup internal distribution. • Use of Seasonal OTC at higher limit while project in Phase 2 • Use of higher OTC requires that responsible party is known for reductions dictated by nomogram relationships. Other criteria: Facilities in service, WECC Project Review group do not object, Must becritical load serving need verified by reliability authority. MIC Liaison Report

  18. OTCPC – Recent Discussion Items 2/2 • Need procedures to resolve Tot 1A, Bonanza West, Path 33, interactions • Deseret has possible issues on operating procedure implementation related to OTC violations. Operators have had difficulties controlling flow. Failure to arm unit tripping can also cause OTC violations. Reliability Coordinators also need to be made aware of the appropriate actions to mitigate OTC violations. • Findings of 2/18/06 PSCO Disturbance Report • Additional power was available, but not scheduled due to perceived transmission constraints. Need to assess ability to use of “counterflow” ATC in emergency events. MIC Liaison Report

  19. MIC Discussion • MIC Interests – Review of Paths with ATC or other Commercial Issues? • Performance – Review of OTC Reductions and Reasons? • Possible action item to review scheduling practices – counterscheduling. • Others? MIC Liaison Report

  20. Future OTCPC Steps • For follow-up: • Review alternatives for addressing affects of new models on operating transfer capability limits in an effort to avoid having to reduce operating transfer capability limits to maintain reliability and comply with established criteria. – Mark Maher/Bob Dintelman RPIC 2/12/2004 • Action Item: This RPIC task force will expand its scope to identify aspects of processes that are broken or can be improved. The original scope was to identify solutions that provide similar reliability without reductions in OTCs. MIC Liaison Report

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