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Petition to Establish a 4th Heating Zone for Enhanced Cost-Effectiveness in Thermal Measures

This petition seeks to establish a 4th heating climate zone, addressing the need for improved cost-effectiveness of measures like R-49 attic insulation, particularly in regions exceeding 9000 Heating Degree Days (HDD). Key supporters include Glacier Electric Cooperative and Vigilante Electric Cooperative, among others. It suggests reviewing current Heating Zone 3 assignments based on updated weather data and proposes various options for setting the lower bound of the new zone. The intent is to enable utilities to better quantify savings from heat pump conversions while ensuring that only those utilities significantly affected can benefit.

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Petition to Establish a 4th Heating Zone for Enhanced Cost-Effectiveness in Thermal Measures

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  1. Petition to Establish a 4th Heating Zone January 6, 2009

  2. Petition Request • RTF Issues • Create a 4th (Heating) Climate Zone • Review cost effectiveness of R-49 attic insulation and other weather sensitive measures • BPA Issue • Permit utilities to count the full savings for heat pumps from actual pre-existing equipment to the heat pump installed (conversions) for High Water Mark determinations.

  3. Petitioners Primary Supporters • Glacier Electric Cooperative - Cut Bank, MT • Vigilante Electric Cooperative - Dillon, MT • Fall River Electric Cooperative - Ashton, ID • Lower Valley Energy, Afton Wyoming Secondary Supporters (may not directly benefit) • Flathead Electric Cooperative - Kalispell, MT • Lincoln Electric Cooperative - Eureka, MT • Mission Valley Power - Pablo, MT • Missoula Electric Cooperative - Missoula MT • Ravalli Electric Cooperative - Corvallis MT • Idaho Falls Power - Idaho Falls, ID

  4. Current Heating Climate Zone Assignments

  5. TMY 3 HDD Are Approximately 5% Lower Than TMY 2 HDD

  6. Issue 1 - TMY3 HDD Data Indicate the Need to Revisit Heating Zone 3’s “Representative” Weather Site Missoula = TMY2 Zone 3 Weather Site Kalispell = TMY3 Zone 3 Weather Site?

  7. Issue 2 Where to set the lower bound for Heating Zone 4? Option 1 - Current Heating Zones cover 1500 HDD Therefore Zone 4 > 9000 HDD (7500+1500) Option 2 – Set lower bound based on material changes in measure cost-effectiveness 9

  8. Only 10 Weather Sensitive Thermal Shell Measures Are“At the Margin” Using the Current Zone 3 Weather SiteOnly 5 If a New Zone 3 Weather Site is Adopted

  9. Only 2 Weather Sensitive HVAC Measures Are“At the Margin” Using the Current Zone 3 Weather SiteNone Are If a New Zone 3 Weather Site is Adopted

  10. However, If 9000 HDD is Lower Bound Only One of the Petitioning Utilities Would Fall in Heating Zone 4

  11. Options • Adopt Kalispell As the Heating Zone 3 “Reference” Site • Accept Petition - Establish a New Heating Zone 4 for Areas with >9000 HDD • Adopt Butte As the Heating Zone 4 “Reference” Site • Reject Petition • In order for additional measures to be cost-effective, the lower bound of Zone 4 has to be set at a level which restricts its application to a single utility

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