Northwestern Energy Group, Inc. · NASDAQ:NWE

Northwestern Energy — Corporate Update (March 2025)

19 slides from Northwestern Energy's corporate update, Mar 26, 2025

  1. Slide 1: Northwestern Energy ETAC Meeting #6 – 2025 MT IRP Planning Cycle

    Northwestern Energy ETAC Meeting # 6 2025 MT IRP Planning Cycle March 26, 2025

  2. Slide 2: Stakeholder Working Group

    Stakeholder Working Thank you Group

  3. Slide 3: Stakeholder Working Group

    Stakeholder Working Group • The mission of the working group is to provide a broad range of perspectives and expertise to inform the development of IRPs that are in the best interest of NorthWestern Energy’s customers and the State of Montana. • Charter and Application • https://www.northwesternener

  4. Slide 4: IRP Work Plan

    Thank IRP Work Plan you

  5. Slide 5: DRAFT - MT IRP Work Plan

    DRAFT - MT IRP Work Plan • ETAC Suggestions?

  6. Slide 6: Resource Adequacy

    Thank you Resource Adequacy

  7. Slide 7: Resource Adequacy

    Resource Adequacy • WECC Western Assessment of Resource Adequacy • Link: https://feature.wecc.org/soti/index.html

  8. Slide 8: New Resource Cost Modeling

    Thank you New Resource Cost Modeling

  9. Slide 9: 2023 MT IRP Candidate Resource Chart

    2023 MT IRP Candidate Resource Chart

  10. Slide 10: DRAFT 2026 IRP Candidate Resource Chart

    DRAFT 2026 IRP Candidate Resource Chart Generation Storage 2025$ 2022$ 2025$ 2022$ Scale Scale Duration Capability Installed Installed Variable O&M Variable O&M No. Montana (MWac) (MWac) (hours) (MWh) Overnight1 ($/kW) Overnight1 ($/kW) % Increase ($/MWh) ($/MWh) % Increase 1 Wind 50 - - - $ 2,238 $

  11. Slide 11: Modeling Scenarios

    Thank you Modeling Scenarios

  12. Slide 12: 2023 MT IRP Scenarios

    "5023 MT IRP Scenarios No. Scenario 1 Base Case Description NorthWestern’s current portfolio including the Colstrip 222 MW acquisition beginning Jan 1, 2026. Colstrip Retirement in 2030 Colstrip 222 MW acquisition occurs in 2026 and then Colstrip retires in 2030. The model indicates replacement reso

  13. Slide 13: Base Portfolio

    Base Portfolio • NorthWestern’s current generation portfolio • Includes 222 MW Avista acquisition and 370 MW Puget acquisition in Colstrip Units 3 and 4 starting January 2026 • Colstrip operates through 2042 • Does not include QF’s without signed PPA as NorthWestern cannot accurately project which Q

  14. Slide 14: Proposed Scenarios for 2026 MT IRP

    Proposed Scenarios for 2026 MT IRP A. Base Case – Colstrip retires December 31, 2042. B. Colstrip retires June 30, 2027, according to MATS. C. Colstrip complies with MATS using baghouse on July 1, 2028 (assuming 1 year extension for work in progress). Colstrip retires December 31, 2031, according to

  15. Slide 15: Proposed Base Case Sensitivities for 2026 MT IRP

    Proposed Base Case Sensitivities for 2026 MT IRP F. ARS allows carbon emitting resources to be selected after 2035. (per MPSC comments from 2023 IRP) G. 50% power costs. H. 150% power costs. I. 50% natural gas costs. J. 150% natural gas costs. K. Proposed data center load.

  16. Slide 16: PowerSimm

    Thank you PowerSimm

  17. Slide 17: PowerSimm

    PowerSimm • Any questions after Whitepaper review? • Output of Results • Is there a preferred format ETAC members would like to see? • Walk through SD cube report

  18. Slide 18: Required Information for PowerSimm Access

    Required Information for PowerSimm Access • Full Name • Email Address • Cell Phone Number • Access to authenticator app • If you haven’t replied to my email with information, please send an email with this required information.

  19. Slide 19: Thank you – Questions/Comments?

    Thank you Questions/Comments?

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