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Economic Planning Study

NorthWestern Energy (NWE) has received three key economic study requests pertaining to energy projects: the Montana Wind & Wires Study, Garrison Pump Storage Study, and MSTI Alternative Study. A TRANSAC meeting on 03/06/08 evaluated the validity of these requests. The Montana Wind & Wires Study aims to assess transmission impacts of wind farms, quantify congestion costs, and estimate transmission upgrades required. All studies were deemed valid, with applications submitted for review to NTTG, highlighting the importance of transmission solutions for renewable energy generation.

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Economic Planning Study

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  1. Economic Planning Study Economic Study Requests & Study Plan

  2. List of Economic Study Requests Received by NWE • NorthWestern Energy (NWE) received 3 Economic Study Requests. • Montana Wind & Wires Study • Submitted By MWWG. (02/27/08) • Garrison Pump Storage • Submitted by PPL Energy Plus. (02/29/08) • MSTI Alternative • Submitted by PPL Energy Plus. (02/29/08)

  3. TRANSAC Conference Call 03/06/08 • On 03/06/08 a TRANSAC meeting was held via conference call. • TRANSAC members and Economic Request Sponsors were present. • All three Economic Request Applications were discussed to determine whether they were valid/ invalid and local/ sub-regional requests.

  4. Valid/Invalid and Local/ Sub-regional • “Montana Wind and Wires” • Study was deemed to be a Valid and Local study without anyone’s objection. • NWE will perform study work. • “Garrison Pump Storage” • Study was deemed to be a Valid and Sub-regional study without anyone’s objection. • The application will be send to NTTG for their review. • “MSTI Alternative” • Study was deemed to be a Valid and Sub-regional study without anyone’s objection. • The application will be send to NTTG for their review.

  5. Montana Wind & Wires Study • Objectives of MWWG Study • Evaluate transmission impacts caused by installation of wind farms in selected high wind areas. • Quantify congestion for various levels and locations of new generation. • Estimate the cost of transmission upgrades to alleviate the congestion.

  6. Assumptions Provided by the sponsor • Different Levels of Wind • 100 MW • 250 MW • 500 MW • Areas of Development • Glacier/ Toole counties • Wheatland/ Judith Basin counties • Park/ Sweet Grass/ Stillwater Counties • Delivery Points: Interconnections to west & south • Machines to be used for modeling : GE 1.5 MW wind machine.

  7. Study Plan • Base Case Conditions • 2015 (hopefully) • Generation • No proposed queue generation. • Plus • 100 MW or • 250 MW or • 500 MW • Increase exports to the neighboring systems • Versus reducing existing generation dispatch. • Light Loads

  8. Study Plan Point of Receipt (POR) • Do not define individual wind farm interconnection requirements. • Assume • Glacier/Toole = Cut Bank • Wheatland/Judith Basin = Judith Gap and/or Two Dot • 50% each? • Park/Sweet Grass/Stillwater = Columbus-Rapelje.

  9. Study Plan Process • Build Express Line • Build an appropriate sized line from POR to POD. • Use Existing System • To connect the Wind Farm to the nearest Transmission line for point of receipt and study the impact on the transmission system. • Reliability • Maintain future network customer capacity • Mix of the two

  10. Study Plan Point of Delivery (POD) “NWE’s interconnections with neighboring transmission systems located west and south of NWE’s system.” • Export paths • MTSE • MTNW • MTID • MSTI? • Pro-rate export across all paths: • Equally • Biased

  11. Study Plan These assumptions equate to: • 9 Scenarios • 3 areas • 3 MW sizes • 2015 light load base case • 1 export assumption (pro-rate vs. bias)

  12. Questions & Suggestions

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