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Northern Tier Transmission Group SPG Report to TEPPC June 17, 2010 Denver To ensure efficient, effective, coordinated use & expansion of the members transmission.

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Presentation on theme: "Northern Tier Transmission Group SPG Report to TEPPC June 17, 2010 Denver To ensure efficient, effective, coordinated use & expansion of the members transmission."— Presentation transcript:

1 Northern Tier Transmission Group SPG Report to TEPPC June 17, 2010 Denver To ensure efficient, effective, coordinated use & expansion of the members transmission systems in the Western Interconnection to best meet the needs of customers & stakeholders.

2 NTTG Activities Planning –Capacity Study Plan for approval, Kick off –Economic Studies Case selected Schedule Cost Allocation Committee –Cataloging methods for Merchant & Jurisdictional –Gearing Up for NOPR Transmission Use Committee –POD/POD Map updated –ATC Updates Joint Initiative –ADI, DSS, ITAP, Business Practices Wind Integration Study Team –Remote versus Local –Dynamic Transfer Limits Implementing Plans - Energizing new transmission

3 Capacity Study Plan Develop Load & resource scenarios: Core (Jurisdictional), Export Test scenarios on existing (2012) transmission system Build an initial 10 year out transmission network model Identify export scenario sinks using Production Cost Model Test L&R scenarios on the 10 yr network –ProCost Dispatch simulation to determine stress hours, export sink locations –L&R stress hours input to Power Flow case Screening reliability studies to identify binding constraints Identify transmission solution options (generic) Test options in dispatch model, performance, identify new stress cases Perform contingency analysis to test proposed projects Identify alternative(s) that best satisfy most scenarios 3

4 Resources in 2019 NTTG Footprint 4

5 Define Load & Resource Scenarios Core case –Firm Requirements from LSEs 1.Resources from IRPs, other formal resource forecasts Scenario Export Cases –Based on submissions in response to Q1 data request 2.Add 3,000 MW of wind resource in Montana 3.Add 3,000 MW of wind resource in Wyoming 4.Add 3,000 MW in Montana, 3,000 MW in Wyoming 5.Add 6,000 MW in Wyoming Export Cases Sink Locations –Source/Sink from data submissions –For scenarios with unidentified sink info - dispatch simulator to identify displaced existing generation through market competition –Coordination with SPGs Page 5 of (##)

6 Build Initial Transmission Network Based on WECC 2012 Heavy Summer case (12hs2a1) –Best near-term forecast to represent present-day transmission –Same base case used by TEPPC modeling Add committed transmission projects –Current TEPPC additions, SCG Foundation List, or other –To model the minimal grid that has maximum likelyhood Use project data (model records) from sponsors or other forums (e.g., TCWG) –High level; not a detailed build-out with low-voltage infrastructure Page 6 of (##)

7 Building Initial Network TEPPC has developed two lists of committed transmission to be added between now & 2019 –Transmission agreed (by a study group) to be needed for reliability or native load service – in the TEPPC 2019 PC1A base case –Transmission identified by the Sub-regional Coordinating Group to be part of a Foundation List of Committed Projects – to be used in the 2020 TEPPC base case NTTG must make its own decision –But may want to rely on the TEPPC lists for projects outside of the NTTG footprint. –Lists provide a starting point for projects within NTTGs footprint Page 7 of (##)

8 Transmission in TEPPC PC1 Page 8 of (##) TEPPC then

9 List of Projects – Sub-regional Coordinating Group 9 Draft - Ver. 4.0, May 11, 2010, Modified by S Wallace Jun 14

10 Test Scenarios on Initial Network Use dispatch model to define resource operation –Loads, resources & network outside the NTTG footprint kept as defined in TEPPCs 2019 PC1A case –NTTG scenarios each have the same load, different resources –See where congestion prevents economical operation –Determine hours where the system is stressed –Export data for selected hours to power flow program Use power flow model to screen potential fixes –Identify where generic transmission additions provide substantial relief –Select a limited set of most effective additions Page 10 of (##)

11 Test Scenarios with Improvements Evaluate Fixes using Hourly Dispatch Model –Identify paths with numerous congested hours –Identify stressed hours with the modified network –Export dispatch for selected hours to Powerflow Examine with Detailed Powerflow Analysis –Replace generic lines with proposed projects having similar characteristics –Perform flow studies (N-0) –Perform reliability screening contingency analysis (N-1, credible N-2) Page 11 of (##)

12 Transmission Projects Submitted In Response to NTTG Q1 Data Request 12

13 Color Key Compar- able Projects Projects Submitted in Q1 Load & Resource Snapshots Diagram of Study Process 13 Initial Transmission Network NTTG Biennial Plan Analysis Committed Transmission Projects WECC 2012hs2A1 Base Case Create Scenarios Exercise Scenarios, Identify & Export Stress Hours Develop Initial Network Test Initial Network Test Base Network Q1 Data Submittals Load & Resource Scenarios Load & Resource Snapshots Test Improvements, Identify & Export Stress Hours Identify Generic Improvements Generic Fixes (.epc) Contingency Analysis Identify Comparable Projects GE PSLF & PTI PSS/E GridView & PROMOD Input Data Intermediate Data Planners

14 Requested Economic Studies Economic Studies Team (EST) will perform one study in 2010 –Base case & (at least) three expansion cases –Base Case WECC TEPPC 2019 PC1A 1500 MW at Townsend in addition to the RPS generation in PC1A case –Transmission Expansion cases AMPS Upgrades Colstrip Upgrade MSTI –Other sensitivities follow up as needed –Cases run on GridView & ProMod & compared

15 Planning Milestones 15 Q1 Gather Information Q2 Study Plan & Assumptions Q3 Perform Analysis Q4 Perform Analysis Q5 Detail Study Draft Report Q6 Further Analysis Q7 Prepare Final Report Q8 Final Plan Approval JFMAMJJASONDJFMAMJJASOND Issue Data Request Data Request Window closes Draft Study Plan completed – scenarios defined Study Plan reviewed at Stakeholders Meeting Development of base network model starts Economic Study begins Economic Study defined & agreed Scenario simulation to generate power flows begins Screening studies with DC power flow analysis begins Simulation of expansion cases begins Power flow evaluation of expansion cases Year 2 Economic Study begins Study Results - Stakeholders Meeting

16 Economic Study Milestones May 07 Obtain, install & verify WECC TEPPC PC1A case May 14 Establish & run core cases (base case & three expansion cases) May 21 Extract & share model outputs May 27 Draft analysis, graphics, observation & conclusions for review June 04 Draft report to Planning Committee June 30 Adoption by Planning Committee

17 Plans Becoming Reality Energizing: Hemingway 500 kV Substation Populus Substation - Nov Ben Lomond –Terminal DCTL 345 kV

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