20251028Final Approved Tariffs.pdf

I.P.U.C. Gas Tariff IDAHO PUBLIC UTILITIES COMMISSION
Section C
Ninth Revised Sheet No.4 Approved Effective
Name October 28, 2025 December 1, 2025
of Utility Intermountain Gas Company Commission Secretary
Natural Gas Appliances Annual Therm
Estimates
Range 23
Seasonal Fireplace 50
Grill 15
Clothes Dryer 28
Water Heater 240
(b) For commercial applicants:
The therm usage estimate will be determined by the Company on a case-by-case basis. The
estimate will be based on the climate zone,the heated structure square footage, commercial
property type, and applicable gas appliances.
4.3 To determine the Allowable Investment per applicant, multiply the estimated annual therm usage
per applicant by the applicable Allowable Investment Factor below to calculate the Allowable
Investment in dollars:
Allowable Investment Factors
Customer Type Service Main Combined
Residential 0.694 0.846 1.540
Commercial 0.516 0.629 1.145
4.4 The applicant agrees to install and activate gas appliances pursuant to the signed agreement(s)
and the therm usage estimates used to determine the Allowable Investment.
4.5 The Company may calculate the Allowable Investment for applicants with structures or business
operations which are non-permanent on a case-by-case basis.
5. PROJECT COST
5.1 In the event the Company can defray any of the trench and backfill costs,for example by sharing
a trench with other utilities, the cost reduction will be included in the Main extension cost or
Service cost estimates.
5.2 The Service Line Project Cost estimate is determined by multiplying the on-property Service Line
length by$19.75 per foot.
Issued by: Intermountain Gas Company
By: Lori A. Blattner Title: Director—Regulatory Affairs

I.P.U.C. Gas Tariff IDAHO PUBLIC UTILITIES COMMISSION
Section C
Seventh Revised Sheet No. 5 Approved Effective
Name October 28, 2025 December 1, 2025
of Utility Intermountain Gas Company Commission Secretary
5.3 The Main Extension Project Cost estimate is based on the Gas Facilities (excluding Services)
required to serve the gas load of the requesting applicant. This includes but is not limited to
Main, regulator stations, valves and Main fittings.
(a) The Company will provide a Project Cost estimate to the applicant prior to execution of an
agreement.
(b) The estimate will exclude costs for Company Betterment.
(c) The Company includes construction overhead charges in the amount of 11.63%.
(d) The Main extension Project Cost will be divided by the number of estimated Service Points
to calculate the Main extension Project Cost per applicant.
6. OTHER PAYMENTS
6.1 The Company may require advanced payment from the applicant in the following situations:
(a) As a guarantee when proposed structures and Services are temporary in nature or the gas
load is unpredictable.
(b) When the Company conducts pre-construction engineering studies to improve the accuracy
of cost estimates.
6.2 If an advanced payment is collected according to Section 6.1(a), the Company will refund an
amount equal to the Allowable Investment to customers who meet the terms outlined in the
General Agreement for guaranteed usage. Refunds will not exceed the amount of the advanced
payment.
6.3 If an advanced payment is collected according to Section 6.1(b),and the actual cost of installation
is less than the estimated cost, the difference will be refunded to the customer.
7. VESTED INTEREST AND DEPOSIT REFUNDS
7.1 A customer or developer is eligible for refund of a payment made for Project Costs in excess of
the Allowable Investment for Mains when additional Service Points, not used in the original
calculation or in a previous refund calculation, connect to the Main extension within five years
from installation.
(a) The Company will conduct annual reviews to determine if additional customers have
connected to the Main and turned on gas service.
(b) Intermountain will take the steps outlined in Section 4 to calculate the Allowable Investment
for Mains for each additional customer.
(c) The Company will refund to the original applicant or developer the equivalent of the Allowable
Investment for Mains for each additional customer. Refunds will be made up to the total
upfront payment, but not to exceed the Project Cost in excess of Allowable Investment for
Mains.
Issued by: Intermountain Gas Company
By: Lori A. Blattner Title: Director—Regulatory Affairs