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Home My WebLink About20251121Compliance Filing.pdf RECEIVED NOVEMBER 21, 2025 AINTERMOUNTAIN IDAHO PUBLIC GAS COMPANY UTILITIES COMMISSION A Subsidiary of MDU Resources Group,Inc. In the Community to Serve® November 21,2025 Monica Barrios-Sanchez Commission Secretary Idaho Public Utilities Commission P.O. Box 83720 Boise, ID 83720-0074 RE: Case No. INT-G-24-05, Compliance Filing Dear Ms. Barrios-Sanchez: Enclosed for filing with this Commission is a copy of the Intermountain Gas Company's("Company") revisions to Rate Schedule EE-RS—Residential Energy Efficiency Rebate Program. The revisions to this rate schedule have been made in compliance with the Commission's Order No. 36797 in Case No. INT-G- 24-05 and include the retirement of the Storage Water Heater, Tankless Water Heater Tier II,Whole Home Tier 11, and Smart Thermostat rebates, as well as a reduction to the incentive for the Furnace—95%AFUE rebate from$350 to $275. The Company requests an effective date of January 1,2026, for these revisions. Additionally,in Order No. 36797,the Commission ordered the Company to "provide the Commission with notification concerning both the timeline for the audit of its EE Program and the results of the audit,when available." In compliance with this order,the Company wishes to report that its Internal Audit department issued an audit report on August 25, 2025, indicating that no issues were identified in its audit of the EE Program for the period January 1,2025—June 30,2025. An internal audit of the EE Program will be on a 3- year rotation going forward. If you should have any questions regarding this report,please contact me at(509) 528-9223 or Kathy Wold at(208) 377-6128. Sincerely, Is/Michael Parvinen Michael Parvinen Director, Regulatory Affairs Intermountain Gas Company Enclosures cc: Preston N. Carter I.P.U.C. Gas Tariff IDAHO PUBLIC UTILITIES COMMISSION Rate Schedules Approved Effective SeeeedThird Revised Sheet No. 16 (Page 1 of 2 April 6, 2021 April 1, 2021 Name Per ON 34980 of ut;,;t Intermountain Gas Company Jan Noriyuki Secretary Rate Schedule EE-RS RESIDENTIAL ENERGY EFFICIENCY REBATE PROGRAM AVAILABILITY: The Intermountain Gas Company Energy Efficiency Rebate Program (EE Program) is available throughout Intermountain's service territory to eligible residential account holders served under the Company's Rate Schedule RS. PROGRAM DESCRIPTION: The purpose of the program is to encourage upgrades to, or use of, high-efficiency natural gas equipment. This will be achieved through the use of rebates offered towards the purchase and installation of qualified energy efficient natural gas equipment and construction of energy efficient new homes. ELIGIBILITY: To qualify for rebates, customers must meet the end-use qualifications identified in the Rebates Table below. All equipment must use natural gas as the fuel source. The customer must also comply with the current program Terms and Conditions. To qualify for Space Heating rebates, a dwelling must use natural gas as the sole heat source upon installation of rebate-qualified equipment. To qualify for Water Heating rebates, a dwelling must utilize natural gas for water heating upon installation of rebate-qualified equipment. Space Heating rebates may not be combined with New Construction rebates. Water Heating-and Twat rebates may be combined with New Construction rebates. Issued by: Intermountain Gas Company By. L eri A. BlattR&FMichael Parvinen Title: Director— Regulatory Affairs I.P.U.C. Gas Tariff IDAHO PUBLIC UTILITIES COMMISSION Rate Schedules Approved Effective €eFifth Revised Sheet No. 16 (Page 2 of 2 May 17, 2022 June 1, 2022 Name Intermountain Gas Company of Utility pan Jan Nori uki y Y Secretary Rate Schedule EE-RS RESIDENTIAL ENERGY EFFICIENCY REBATE PROGRAM (Continued) REBATES: Rebate Rebate Type Minimum Efficiency Rating Rebate Amount Whole Home Tier I New Tier I Requirements: $900 Construction 0 HERS rated • Air sealing at or below 3 ACH at 50 Pa • Ceiling insulation at or above R-49 • Ducts and air handler located inside conditioned space or duct leakage to outside of less than 4 CFM25/100 ft2 CFA • Furnace efficiency at or above 97% AFUE Whele 4-L,me Tier 11 New Tier 11 Req u eRtS: #66 e • HERS rotor+ • Air sealing at er holew n ACH at 50 Pa • D Gts anrd air handler Ieea+erd inside Genditlened cpaGe r d Gt leakage+e ei aside of less than n GFM25/100 ft2 GF 0 Combination Boiler for Space Heating 95%AFUE $800 Space and Water Heat Furnace Space Heating 95% AFUE $275350 Boiler Space Heating 95%AFUE $800 Storage Water Heater Water Heating aQ�G Tankless Water Water Heating .91 UEF $325 Heater Tier I Tankless Water Water Heating 87�C $300 ue-ter Tier n Smart The ester+ Thermesta Energy Star Certified $4.88 GENERAL PROVISIONS: All installations of equipment must comply with all codes and permit requirements applicable in the state of Idaho and must be properly inspected, if required, by appropriate agencies. Customers must submit required documentation of purchase and installation to the Company under the Terms and Conditions of the current rebate program. The Company reserves the right to verify installation prior to the payment of any rebates. Issued by: Intermountain Gas Company By. 1 eri A. ale++nerMichael Parvinen Title: Director— Regulatory Affairs €ffeGtive: dune 1, 2022 I.P.U.C. Gas Tariff Rate Schedules Third Revised Sheet No. 16 (Page 1 of 2 Name of Utility Intermountain Gas Company Rate Schedule EE-RS RESIDENTIAL ENERGY EFFICIENCY REBATE PROGRAM AVAILABILITY: The Intermountain Gas Company Energy Efficiency Rebate Program (EE Program) is available throughout Intermountain's service territory to eligible residential account holders served under the Company's Rate Schedule RS. PROGRAM DESCRIPTION: The purpose of the program is to encourage upgrades to, or use of, high-efficiency natural gas equipment. This will be achieved through the use of rebates offered towards the purchase and installation of qualified energy efficient natural gas equipment and construction of energy efficient new homes. ELIGIBILITY: To qualify for rebates, customers must meet the end-use qualifications identified in the Rebates Table below. All equipment must use natural gas as the fuel source. The customer must also comply with the current program Terms and Conditions. To qualify for Space Heating rebates, a dwelling must use natural gas as the sole heat source upon installation of rebate-qualified equipment. To qualify for Water Heating rebates, a dwelling must utilize natural gas for water heating upon installation of rebate-qualified equipment. Space Heating rebates may not be combined with New Construction rebates. Water Heating rebates may be combined with New Construction rebates. Issued by: Intermountain Gas Company By: Michael Parvinen Title: Director— Regulatory Affairs I.P.U.C. Gas Tariff Rate Schedules Fifth Revised Sheet No. 16 (Page 2 of 2 Name of Utility Intermountain Gas Company Rate Schedule EE-RS RESIDENTIAL ENERGY EFFICIENCY REBATE PROGRAM (Continued) REBATES: Rebate Rebate Type Minimum Efficiency Rating Rebate Amount Whole Home Tier I New Tier I Requirements: $900 Construction 0 HERS rated • Air sealing at or below 3 ACH at 50 Pa • Ceiling insulation at or above R-49 • Ducts and air handler located inside conditioned space or duct leakage to outside of less than 4 CFM25/100 ft2 CFA • Furnace efficiency at or above 97% AFUE Combination Boiler for Space Heating 95%AFUE $800 Space and Water Heat Furnace Space Heating 95%AFUE $275 Boiler Space Heating 95%AFUE $800 Tankless Water Water Heating .91 UEF $325 Heater Tier I GENERAL PROVISIONS: All installations of equipment must comply with all codes and permit requirements applicable in the state of Idaho and must be properly inspected, if required, by appropriate agencies. Customers must submit required documentation of purchase and installation to the Company under the Terms and Conditions of the current rebate program. The Company reserves the right to verify installation prior to the payment of any rebates. Issued by: Intermountain Gas Company By: Michael Parvinen Title: Director— Regulatory Affairs