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Buffalo Ridge Incremental Generation Outlet (BRIGO) Transmission Study

Buffalo Ridge Incremental Generation Outlet (BRIGO) Transmission Study. Presentation to National Wind Coordinating Committee June 22, 2005 W Grivna, PE of Xcel Energy R Gonzalez, PE of Excel Engineering, Inc. Outline. Study Purpose/Goals Background Participants Analysis Results

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Buffalo Ridge Incremental Generation Outlet (BRIGO) Transmission Study

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  1. Buffalo Ridge Incremental Generation Outlet (BRIGO)Transmission Study Presentation to National Wind Coordinating Committee June 22, 2005 W Grivna, PE of Xcel Energy R Gonzalez, PE of Excel Engineering, Inc.

  2. Outline • Study Purpose/Goals • Background • Participants • Analysis • Results • Conclusions/Recommendations • Next Steps

  3. Study Purpose/Goals • Determine feasibility of increasing Buffalo Ridge area generation outlet… • by several hundred MW… • through “modest” (presumably 115 kV-class) improvements… • that could be relatively quickly implemented… • while plans for future long-range regional transmission projects continue their evolution.

  4. Background • Buffalo Ridge is the premier wind resource in MN/SD • Transmission improvements under way to increase outlet capacity to 825 MW • Further interest confirmed by MISO & WAPA interconn queues • Xcel Energy has had specific MW & Energy % mandates • All other Minnesota power suppliers now also have renewable energy obligations • Result: Intense interest in wind development on the Ridge

  5. Transmission map of Buffalo Ridge Area

  6. Study Participants • Sponsor: Xcel Energy • Technical & Economic Analyses performed by Xcel Energy

  7. Reviewers/technical support: (MAPP MB SPG) • Western Area Power Administration • Otter Tail Power • Missouri River Energy Services • MISO • Marshall Municipal Utilities • Great River Energy • East River Electric Power Cooperative • Alliant Energy • State regulators (MN/ND/SD) • Energy Policy Groups (Wind on the Wires) • IPPs

  8. Analysis • Powerflow: Concentrate on 2007, summer off-peak condition • System intact • First contingency (“n-1”) • Requirement: satisfy applicable voltage and loading criteria • Identify “existing system” (post-825 MW additions) outlet limits for Buffalo Ridge Mpls/St Paul deliveries • Formulate transmission options • Test Options’ performance • Electrical • Financial

  9. Cost versus Outlet for Options

  10. Complications • Reactive power requirements/Voltage Stability • Power and Energy losses • Load-serving considerations • Constructability • MISO-WAPA interface • North Dakota Export (NDEX) interface • Geographic extent of Ridge

  11. Results • All Options can achieve 300-500 MW of incremental outlet • Some Options require extensive additional improvements • Line reconductors & rebuilds • Transformer replacements • Shunt capacitor additions • Incremental energy losses are high (25 – 30%) • The “best” Options all include a second (independent) Fenton-Nobles Co 115 kV outlet path to the new 345 kV

  12. Conclusions/Recommendations • Implement “Option 31A” • 2nd Nobles Co 345/115 kV transformer • 2nd Nobles Co-Fenton 115 kV line • Lake Yankton-Marshall 115 kV line • Several shunt capacitor banks • Misc reconductors, equipment upgrades • Capable of providing 300 - 500 MW of incremental outlet (beyond 825 MW level) at reasonable cost • Provides some incidental load-serving benefits

  13. Map of Option 31A

  14. Next Steps • Coordinate & confirm compatibility with likely long-range plans & identified projects • CapX • Big Stone 2 • MISO NW Exploratory • Address adaptation to specific proposed wind gen projects • (Need “Yankee fix” if MWs on north Ridge exceed critical level) • Coordinate with MISO stability study results • Initiate permitting process

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