20250530Harris Exhibit Nos. 39-40.pdf

Preston N. Carter, ISB No. 8462
Megann E. Meier, ISB No. 11948
GIVENS PURSLEY LLP
601 West Bannock Street
P.O. Box 2720
Boise, Idaho 83701-2720
Office: [phone]
Fax: [phone]
[e-mail]
[e-mail]
Attorneys for Intermountain Gas Company
BEFORE THE IDAHO PUBLIC UTILITIES COMMISSION
IN THE MATTER OF THE APPLICATION Case No. INT-G-25-02
OF INTERMOUNTAIN GAS COMPANY
FOR THE AUTHORITY TO INCREASE
ITS RATES AND CHARGES FOR
NATURAL GAS SERVICE IN THE STATE
OF IDAHO
EXHIBIT 39 TO ACCOMPANY THE
DIRECT TESTIMONY OF ZACH HARRIS

I.P.U.C. Gas Tariff IDAHO PUBLIC UTILITIES COMMISSION
Rate Schedules Approved Effective
Fourteenth Fifteenth Revised Sheet No. 1 (Page 1 of 1) Sept. 30, 2024 Oct. 1, 2024
Name PeF Intermountain Gas Company O.N.
of Utility p y Secretafy
Rate Schedule RS
RESIDENTIAL SERVICE
APPLICABILITY:
Applicable to any customer using natural gas for residential purposes.
RATE:
Monthly minimum charge is the Customer Charge.
Effective Janua 1 2026 Effective Janua 1 2027
Customer Charge (per bill $14.00 $20.00
Per Therm Charges
Distribution Char e $0.10782 $0.01400
Property EEqperty Tax $0.00329 $0.00329
Cost of Gas
1 Temporaa Cost of Gas 0.07218 0.07218
2 Weighted Average Cost of Gas $0.26839 $0.26839
3 Gas Transportation $0.20737 $0.20737
EE Char e $0.01149 $0.01149
Total Per Therm Charge JQ.52618 $0.43236
Gusterner Charge: $8 00 per hill
�rT
Per Therm. rage: $0 54808*
*IRG' des the f0l'OWORg:
Gest of Gas: 1)Temporary PUFGhased gas eost adjustment ($0 n774 n)
2)Weighted average GGSt 4 gas $0 268-
3)Gas transpORatien GeSt $0 20737
DlStrohi if, ost: $0 fI330i
€€Charge: $0.01149
PURHASED GAS COST ADJUSTMENT:
This tariff is subject to an adjustment for the cost of purchased gas as provided for in Rate Schedule PGA.
This adjustment is incorporated into the calculation of the Cost of Gas stated on customer bills.
Case No.INT-G-25-02
Z. Harris,IGC
Exhibit No. 39
Page, I of 47
issued by: Intermountain Gas Company
By: Lori A. Blattner Title: Director—Regulatory Affairs

I.P.U.C. Gas Tariff IDAHO PUBLIC UTILITIES COMMISSION
Rate Schedules Approved Effective
Fourteenth{ rr Fifteenth Revised Sheet No. 1 (Page 1 of 1) Sept. 30, 2024 Oct. 1, 2024
Name Intermountain Gas Company Per O.N. 36338
of Utility p y Monica Barrios-Sanchez Secretary
ENERGY EFFICIENCY CHARGE ADJUSTMENT:
This tariff is subject to an adjustment for costs related to the Company's Energy Efficiency program as
provided for in Rate Schedule EEC-RS. The Energy Efficiency Charge is separately stated on customer bills.
PROPERTY TAX CHARGE:
The Property Tax Charge is applied in accordance with House Bill 329 that was approved in the 2025 state
legislature.
SERVICE CONDITIONS:
All natural gas service hereunder is subject to the General Service Provisions of the Company's Tariff, of
which this rate schedule is a part.
Case No.INT-G-25-02
Z. Harris,IGC
Exhibit No. 39
issued by: Intermountain Gas Company
By: Lori A. Blattner Title: Director—Regulatory Affairs

I.P.U.C. Gas Tariff IDAHO PUBLIC UTILITIES COMMISSION
Rate Schedules Approved Effective
S'y-NinthSeventieth Revised Sheet No. 3 (Page 1 of 2) Sept. 30, 2dOct. 1, 2024
Nm
ofUtlity Intermountain Gas Company PeF O.N-?6338
Menoca Cs-Sanc11ez Se6Fetar-y
Rate Schedule GS-1
GENERAL SERVICE
APPLICABILITY:
Applicable to customers whose requirements for natural gas do not exceed 2,000 therms per day,at any point
on the Company's distribution system. Requirements in excess of 2,000 therms per day may be allowed at
the Company's discretion.
RATE:
Monthly minimum charge is the Customer Charge.
Customer Charge (per bill $40.00
Per Therm Charges
Distribution Charge
Block One: First 200 Therms per bill $0.11061
Block Two: Next 1,800 Therms per bill $0.09654
Block Three: Next 8,000 Therms per bill $0.08296
Block Four: Over 10,000 Therms per bill $0.04190
Pro ert Tax $0.00329
Cost of Gas
1 Tem ora Cost of Gas 0.07113
2 Weighted Avera e Cost of Gas $0.26839
3 Gas Transportation $0.18889
EE Charge $0.00000
Total Per Therm Charge
Block One: First 200 Therms per bill $0.50005
Block Two: Next 1,800 Therms per bill $0.48598
Block Three: Next 8,000 Therms per bill $0.47240
Block Four: Over 10,000 Therms er bill 0.43134
GNs„.er Charge: $1 F nn n boll
Per Therm rage: BIOGk One: First 200 therms per boll @ $0 55500*
BleGk Two: Paext 1,800 therms per hall @ $0 53353*
BIeGkThree Next B-Ow therms per boll @ $0 51280*
B.or--.k r Over 10,000 rn boll n xn n 1111
*Includes the followO
Gest of Gas: 1\Ternperar FGhased gas cest-aja�dent ($0 071 13)
adjustment
2)Weighted average mac}of nos $0 76839
7Ge° "'9a rar1 TCE)St�`�'Ste' $0 19889
D0str0hh ost: Block One: Forst 200 therms per hill @ $0 16885
Case No.INT-G-25-02
Z. Harris,IGC
Exhibit No. 39
Page I of 47
Issued by: Intermountain Gas Company
By: Lori A. Blattner Title: Director-Regulatory Affairs

I.P.U.C. Gas Tariff IDAHO PUBLIC UTILITIES COMMISSION
Rate Schedules Approved Effective
S'y-NinthSeventieth Revised Sheet No. 3 (Page 1 of 2) Sept. 30, 2d
Nm
ofUtlity Intermountain Gas Company PeF O.N-?6??8
Cs-SwnChez Se6Fetafy
Next 800therms per Qn 94738
Block Two: 1 ��r bill
B'eGL Three: Next , n�-6100therm r hill @ Qn 11 7FFG
B'eGL Fe ur OveF 10,000 thermsr hill @ $0 06396
€E Chargemacm. $0 nnnnn
.
Case No.INT-G-25-02
Z. Harris,IGC
Exhibit No. 39
Page,4 of 47
Issued by: Intermountain Gas Company
By: Lori A. Blattner Title: Director-Regulatory Affairs

I.P.U.C. Gas Tariff IDAHO PUBLIC UTILITIES COMMISSION
Rate Schedules Approved Effective
Sixty-"'Nint"Seventieth Revised Sheet No. 3 (Page 2 of 2) Sept. 30, 2024 Oct. 1, 2024
Name Intermountain Gas Company Per O.N. 36338
of Utility p y Monica Barrios-Sanchez Secretary
Rate Schedule GS-1
GENERAL SERVICE
(Continued)
For separately metered deliveries of gas utilized solely as Compressed Natural Gas Fuel in vehicular internal
combustion engines.
Customer Charge (per bill $40.00
Per Therm Charges
Distribution Charge
Block One: First 10,00000 Therms per bill $0.08296
Block Two: Over 10,000 Therms per bill $0.04190
Property Tax $0.00329
Cost of Gas
1 Temporary Cost of Gas 0.07113
2 Weighted Average Cost of Gas $0.26839
3 Gas Trans ortation $0.18889
Qn 00000
Total Per therm Charge
Block One: First 10,00000 Therms per bill 0.47-3240
Block Two: Over 10,000 Therms er bill JQ.43134
Gustemer rage: $16-00 per hill
PerchCharge: Block Q„e.- Forst 10,000zherms per hill @ $0. 61280"
Block Two: QveF i 0,000theFmS peF boll @ $0 450W
*Inn'-idpq thn fnlln,nii rin• ,,+ .,
Cost of vas: 1 TPa FGhused-gas gas adjustment ($0 '1 071'IN
2)Weighted average GeSt of gas $ 7a 839
3)Gas transpORatienrCGst $0 198
Distr'butmen Gust: PlockQ„ePirst 1n�nerms per hill @ $0 126 1
BIGGk T,.,n• Over 10,000 therm per hill n $0 063 -
PURCHASED GAS COST ADJUSTMENT:
This tariff is subject to an adjustment for the cost of purchased gas as provided for in Rate Schedule PGA.
This adjustment is incorporated into the calculation of the Cost of Gas stated on customer bills.
ENERGY EFFICIENCY CHARGE ADJUSTMENT:
This tariff is subject to an adjustment for costs related to the Company's Energy Efficiency program as
provided for in Rate Schedule EEC-GS. The Energy Efficiency Charge is not applicable to gas utilized solely
Case No.INT-G-25-02
Z. Harris,IGC
Exhibit No. 39
Issued by: Intermountain Gas Company
By: Lori A. Blattner Title: Director-Regulatory Affairs

I.P.U.C. Gas Tariff IDAHO PUBLIC UTILITIES COMMISSION
Rate Schedules Approved Effective
Sixty-"'Nint"Seventieth Revised Sheet No. 3 (Page 2 of 2) Sept. 30, 2024 Oct. 1, 2024
Name Intermountain Gas Company Per O.N. 36338
of Utility p y Monica Barrios-Sanchez Secretary
as Compressed Natural Gas Fuel in vehicular internal combustion engines. The Energy Efficiency Charge is
separately stated on customer bills.
PROPERTY TAX CHARGE:
The Property Tax Charge is applied in accordance with House Bill 329 that was approved in the 2025 state
legislature.
SERVICE CONDITIONS:
All natural gas service hereunder is subject to the General Service Provisions of the Company's Tariff,
of which this rate schedule is a part.
Case No.INT-G-25-02
Z. Harris,IGC
Exhibit No. 39
Issued by: Intermountain Gas Company
By: Lori A. Blattner Title: Director-Regulatory Affairs

I.P.U.C. Gas Tariff IDAHO PUBLIC UTILITIES COMMISSION
Rate Schedules Approved Effective
Twent -Ei#-h-Sixth Revised Sheet No. 4 (Page 1 of 2 Sept 30 2424 Oct. 1 �024
Name Intermountain Gas Company PeFA:#�6338 rptary
of Utility p Y
7
Rate Schedule IS-R
RESIDENTIAL INTERRUPTIBLE SNOWMELT SERVICE
APPLICABILITY:
Applicable to any residential customer otherwise eligible to receive service under Rate Schedule RS who
has added natural gas snowmelt equipment after 6/1/2010. The intended use of the snowmelt equipment is
to melt snow and/or ice on sidewalks, driveways or any other similar appurtenances. Any and all such
applications meeting the above criteria will be subject to service under Rate Schedule IS-R and will be
separately and individually metered. All service hereunder is interruptible at the sole discretion of the
Company.
FACILITY REIMBURSEMENT CHARGE:
All new interruptible Snowmelt service customers are required to pay for the cost of the Snowmelt meter set
and other related facility and equipment costs, prior to the installation of the meter set. Any request to alter
the physical location of the meter set and related facilities from Company's initial design may be granted
provided, however, the Company can reasonably accommodate said relocation and Customer agrees to
pay all related costs.
RATE:
Monthly minimum charge is the Customer Charge.
Effective Janua 1 2026 Effective JaaqgpL1 20.27
Customer Charge (per bill $14.00 $20.00
Per Therm Charges
Distribution Charge $0.10782 $0.01400
Pro ert Tax $0.00329 $0.00329
Cost of Gas
1 Tem ora Cost of Gas 0.07218 0.07218
2 Weighted Average Cost of Gas $0.26839 $0.26839
3 Gas Transportation $0.20737 $0.20737
Total Per Therm Charge 0.51469 $0.42087
Gustemer Charge: $8 00 per hill
Per Therm Charge: $0 14nn*17-FQ
*Inrl des the fellGWiRg:
nn,;t Arvu8: \Ternneron P61FGhased gas Gest adjUStMeRt inn n7 )
2)Weighted average costs $0 268 2�
3) (sec transportation cost $0 `zJ0737
"Y yv
D�str'bUt , oust: $0 1330
g
PURCHASED GAS COST ADJUSTMENT:
This tariff is subject to an adjustment for the cost of purchased gas as provided for in Rate ch ul
This adjustment is incorporated into the calculation of the Cost of Gas stated on customer idso.eINP -6-25-02
Z. Harris,IGC
Exhibit No. 39
Issued by: Intermountain Gas Company Page 7 of 17
By: Lori A. Blattner Title: Director—Regulatory Affairs

I.P.U.C. Gas Tariff IDAHO PUBLIC UTILITIES COMMISSION
Rate Schedules Approved Effective
Twenty-Fe Fifth Revised Sheet No. 5 (Page 1 of 2 Sept. 30, 2024 Oct. 1. 20�4
Name Intermountain Gas Company Per O.N. 36338
of Utility P Y
Monica Barrios-Sanchez Secretary
Rate Schedule IS-C
SMALL COMMERICAL INTERRUPTIBLE SNOWMELT SERVICE
APPLICABILITY:
Applicable to any customer otherwise eligible to receive gas service under Rate Schedule GS-1 who has
added natural gas snowmelt equipment after 6/1/2010. The intended use of the snowmelt equipment is to
melt snow and/or ice on sidewalks, driveways or any other similar appurtenances. Any and all such
applications meeting the above criteria will be subject to service under Rate Schedule IS-C and will be
separately and individually metered. All service hereunder is interruptible at the sole discretion of the
Company.
FACILITY REIMBURSEMENT CHARGE:
All new interruptible Snowmelt service customers are required to pay for the cost of the Snowmelt meter set
and other related facility and equipment costs, prior to the installation of the meter set. Any request to alter
the physical location of the meter set and related facilities from Company's initial design may be granted
provided, however, the Company can reasonably accommodate said relocation and Customer agrees to pay
all related costs.
RATE:
Monthly minimum charge is the Customer Charge.
Customer Char e er bill $40.00
Per Therm Char es
Distribution Charge
Block One: First 200 Therms per bill $0.11061
Block Two: Next 1,800 Therms per bill $0.09654
Block Three: Next 8,000 Therms per bill $0.08296
Block Four: Over 10,000 Therms per bill $0.04190
Pro ert Tax $0.00329
Cost of Gas
1 Tem ora Cost of Gas 0.0721138
2 Weighted Average Cost of Gas $0.26839
3 Gas Transportation $0.2073718889
$n n11na
Total Per Therm Charge
Block One: First 200 Therms per bill $0.50005
Block Two: Next 1,800 Therms per bill $0.48598
Block Three: Next 8,000 Therms per bill $0.47240
Block Four: Over 10,000 Therms er bill 0.43134
Gustemer Charge: $17 50 per hill
Per Therm ChaFge: RIeruk Qne- Forst 280 Uhe.rmsper bill @
$0 55500*
BIGGk Two N inn therms hill @
Next� w-cr�er��--13er�r*r
$0 53353*
BIGGk Three: Next 8,000 therms per bill @
$0 51280*
BIGGk Four: 10,000 therms perdu n $n n501 1
Case No.INT-G-25-02
Z. Harris,IGC
x i it No. 39
Issued by: Intermountain Gas Company Exhibit
8 of 17
By: Lori A. Blattner Title: Director—Regulatory Affairs

IDAHO PUBLIC UTILITIES COMMISSION
I.P.U.C. Gas Tariff
Rate Schedules Approved Effective
Twenty-Fe Fifth Revised Sheet No. 5 (Page 1 of 2 Sept.30,-2024 Oct. 1. 202i
Name Intermountain Gas Company of Utilityp Y
9nnh- cenref-.r„
*InGl des the f9l'GWORg:
CA'd er vuS: \To.,,nr,ran PLIFGhased gAS GGc ,n+ ixn m1 3\
7\Weighted aveFage GSt of gas $0 26839
3 Gas tra%portation Cost $0.18889
D'st'hu tinn Charge: Block One: Farst 200 therrns per bill @
$0 i 6985
BleGk Twe: I\IPex i t nn therms Per hill @
r � vv-cr� �rrr
$0 147 8
BIGGk Three: Next 9,000 therms per hill n
$0.12665
Bled r—Over 10 netherper ill @ $0 06396
�v�vvvv
PROPERTY TAX CHARGE:
The Property Tax Charge is applied in accordance with House Bill 329 that was approved in the 2025 state
legislature.
Case No.INT-G-25-02
Z. Harris,IGC
x t it No. 39
Issued by: Intermountain Gas Company Exhibit
9 of 17
By: Lori A. Blattner Title: Director—Regulatory Affairs

I.P.U.C. Gas Tariff IDAHO PUBLIC UTILITIES COMMISSION
Rate Schedules Approved Effective
Sevent -&xtl Seven Revised Sheet No. 7 (Page 1 of 2 .SEp�-3A-2-024 Oct. 1 2024
Name Intermountain Gas Company of Utility p Y .
26338
Monica Ba '
Rate Schedule LV-1
LARGE VOLUME FIRM SALES SERVICE
AVAILABILITY:
Available at any mutually agreeable delivery point on the Company's distribution system to any existing customer
receiving service under the Company's rate schedule LV-1 or any customer not previously served under this schedule
whose usage does not exceed 500,000 therms annually, upon execution of a one-year minimum written service
contract for firm sales service in excess of 200,000 therms per year.
MONTHLY RATE:
Customer Char a er bill $375.00
Demand Charge (per MDFQ therm $0.44000
Per Therm Charges
Distribution Charge
Block One: First 35,000 Therms per bill $0.02857
Block Two: Next 35,000 Therms per bill $0.01130
Block Three: Over 70,000 Therms er bill $0.00700
Pro ert Tax $0.00329
Cost of Gas
1 Tem ora Cost of Gas 0.04807
2 Weighted Average Cost of Gas $0.26839
3 Gas Trans ortation $0.10403
BTotal Per Therm Charge
Block One: First 35,000 Therms per bill $0.35621
Block Two: Next 35,000 Therms per bill $0.33894
Block Three: Over 70,000 Therms er bill 0.33464
Gust-mer Charge: $1 tin r.nn er boll
�R
Demand Charge: $0 32000 per� DFQ therm
Demand
Per Therm Charge: r First 35 nn e per $0 l54 25*
,�•, a.9�Ble�l��r+e: Firms����-th�rms�.�r biller
Block Two: Next 35 nn therm per hill n $0 13622-
Block Three: Over 000 therm per hill @ $0 3317n*
�..vcr� r-rrr���vati�
*Intl des the felle..d.,..•
Gost of Gas: 1)Temperary purG-iased gas GGst adjustment
2)Weighted average GGSt of gas $0 26839
3)Gas ranspORatiGR Rest $0 1nnn�
DoStrobu#inM C6St: RIn-rak Q n e: Forst 35,000 rms per boll @ $0 03000
RI.,..L T...e: Next 35,000 therms per boll @ $0 01187
9I9GI(Threevpr70,000 therms per bill @ Qn nn7z5
PURCHASED GAS COST ADJUSTMENT:
This tariff is subject to an adjustment for the cost of purchased gas as provided for in Rate Schedule PGA. This
adjustment is incorporated into the calculation of the Cost of Gas stated on customer bills.
Case No.INT-G-25-02
Z. Harris,IGC
Exhibit No. 39
Page 10 of 17
Issued by: Intermountain Gas Company
By: Lori A. Blattner Title: Director-Regulatory Affairs

I.P.U.C. Gas Tariff IDAHO PUBLIC UTILITIES COMMISSION
Rate Schedules Approved Effective
Sevent _S*th Seven Revised Sheet No. 7 (Page 1 of 2 .SEp�-3A-2-024 Oct. 1 2024
Name Intermountain Gas Company of Utility p Y .
26338
Monica Ba '
PROPERTY TAX CHARGE:
The Property Tax Charge is applied in accordance with House Bill 329 that was approved in the 2025 state legislature.
SERVICE CONDITIONS:
1. All natural gas service hereunder is subject to the General Service Provisions of the Company's Tariff, of
which this Rate Schedule is a part.
2. The customer shall negotiate with the Company, a mutually agreeable Maximum Daily Firm Quantity
(MDFQ), which will be stated in and in effect throughout the term of the service contract.
3The monthly Demand Charge will be equal to the MDFQ times the Demand Charge rate. Demand Charge
relief will be afforded to those LV-1 customers when circumstances impacted by force majeure events prevent
the Company from delivering natural gas to the customer's meter.
3.
Case No.INT-G-25-02
Z. Harris,IGC
Exhibit No. 39
Issued by: Intermountain Gas Company
By: Lori A. Blattner Title: Director—Regulatory Affairs

I.P.U.C. Gas Tariff IDAHO PUBLIC UTILITIES COMMISSION
Rate Schedules
Sixth ift#�_Revised Sheet No. 7 (Page 2 of 2 Approved Effective
Name Intermountain Gas Company Nov. 16, 2021 Dec. 1. 2021
of Utility pan y Jan Noriyuki Secretary{
Rate Schedule LV-1
LARGE VOLUME FIRM SALES SERVICE
(Continued)
BILLING ADJUSTMENTS:
1. In the event that total deliveries to any new LV-1 customer did not meet the 200,000 therm threshold
during the current contract period, an additional amount shall be billed. The additional amount shall
be calculated by billing the customer's total usage during that contract period at the Rate Schedule
GS-1 Block 3 rate, and then subtracting the amounts previously billed during the annual contract
period. The customer's future eligibility for the LV-1 Rate Schedule will be renegotiated with the
Company.
2. In the event that total deliveries to any existing LV-1 customer within the most recent three contract
periods met or exceeded the 200,000 therm threshold, but the customer during the current contract
period used less than the contract minimum of 200,000 therms, an additional amount shall be billed.
The additional amount shall be calculated by billing the deficit usage below 200,000 therms at the LV-
1 Block 1-Distribution Cost raterate adjusted f r the r al A-f variable gas StS. The customer's
future eligibility for the LV-1 Rate Schedule will be renegotiated with the Company.
3. In the event the customer requires daily usage in excess of the MDFQ, and subject to the availability
of firm interstate transportation to serve Intermountain's system, all such excess usage will be billed
under Rate Schedule LV-1.Additionally, all excess MDFQ above the customer's contracted MDFQ for
the month will be billed at the monthly Demand Charge rate.
Case No.INT-G-25-02
Z. Harris,IGC
Exhibit No. 39
Issued by: Intermountain Gas Company
By: Lori A. Blattner Title: Director—Regulatory Affairs

I.P.U.C. Gas Tariff IDAHO PUBLIC UTILITIES COMMISSION
Rate Schedules Approved Effective
Twent - Seventh Revised Sheet No. 8 (Page 1 of 24 Sept. 30, 2024 Oct. 1. �202
Name of Utility IntermountainO.N.Intermountain Gas CompanyZg
o canchez SecnetaFY
.,
Rate Schedule T-3
INTERRUPTIBLE DISTRIBUTION TRANSPORTATION SERVICE
AVAILABILITY:
Available at any mutually agreeable delivery point on the Company's distribution system to any customer
upon execution of a one-year minimum written service contract for interruptible transportation service.
MONTHLY RATE:
Customer Charge (per bill $600.00
Per Therm Char es
Distribution Charge
Block One: First 100,000 Therms per bill $0.03686
Block Two: Next 50,000 Therms per bill $0.01501
Block Three: Over 150,000 Therms per bill $0.00553
Property Tax $0.00041
Temporary Tpmporary Cost of Gas 0.00205
Total Per Therm Charge
Block One: First 35,000 Therms per bill $0.035229
Block Two: Next 35,000 Therms per bill $0.01337
Block Three: Over 70,000 Therms aQ.00389
Per Therm Charge: BIOGk One: Forst 100-000 therms toned @ $0 03489*
RIGnL Two: Next 5n 000 therms transported @ $0 01299*
Next vv,�vv�rn,-rr-ru--au.transported -�v�v--r-�-vv
Block Three: Over 150,000 therms transported n $0 00349*
*Includes temporary purchased gas cost adjustment of($0.00205)
ANNUAL MINIMUM BILL:
The customer shall be subject to the payment of an annual minimum bill based on annual usage of 200,000
therms. The deficit usage below 200,000 therms shall be billed at the T-3 Block 1 rate.An annual minimum
bill will not apply if the customer is a renewable natural gas production facility.
PURCHASED GAS COST ADJUSTMENT:
This tariff is subject to an adjustment for the cost of purchased gas as provided for in Rate Schedule PGA.
This adjustment is incorporated into the calculation of the Cost of Gas stated on customer bills.
PROPERTY TAX CHARGE:
The Property Tax Charge is applied in accordance with House Bill 329 that was approved in the 2025 state
legislature.
Case No.INT-G-25-02
Z. Harris,IGC
Exhibit No. 39
Page 11 of 17
Issued by: Intermountain Gas Company
By: Lori A. Blattner Title: Director—Regulatory Affairs

I.P.U.C. Gas Tariff
Rate Schedules
Original Sheet No. 8 Page 2 of 2
Name Intermountain Gas Company
of Utility p Y
Rate Schedule T-3
INTERRUPTIBLE DISTRIBUTION TRANSPORTATION SERVICE
SERVICE CONDITIONS:
1. All natural gas service hereunder is subject to the General Service Provisions of the Company's
Tariff, of which this Rate Schedule is a part.
2. This service does not include the cost of the customer's gas supply or the interstate pipeline capacity.
The customer is responsible for procuring its own supply of natural gas and transportation to
Intermountain's distribution system under this Rate Schedule.
3. The customer understands and agrees that the Company is not responsible to deliver gas supplies
to the customer which have not been nominated, scheduled, and delivered by the interstate pipeline
to the designated city gate.
4. The Company, in its sole discretion, shall determine whether or not it has adequate capacity to
accommodate transportation of the customer's gas supply on the Company's distribution system.
5. If requested by the Company, the customer expressly agrees to immediately curtail or interrupt its
operations during periods of capacity constraints on the Company's distribution system.
Case No.INT-G-25-02
Z. Harris,IGC
Exhibit No. 39
Page 14 of 17
Issued by: Intermountain Gas Company
By: Lori A. Blattner Title: Director—Regulatory Affairs

I.P.U.C. Gas Tariff IDAHO PUBLIC UTILITIES COMMISSION
Rate Schedules Approved Effective
Twent -Fo�Fifth Revised Sheet No. 9 (Page 1 of 2 Sept. 30, 2024 Oct. 1, 2024
Name Intermountain Gas Company Per O.N. 36338
of Utility p y Monica Barrios-Sanchez Secretary
Rate Schedule T-4
FIRM DISTRIBUTION ONLY TRANSPORTATION SERVICE
AVAILABILITY:
Available at any mutually agreeable delivery point on the Company's distribution system to any customer
upon execution of a one year minimum written service contract for firm distribution transportation service in
excess of 200,000 therms per year.
MONTHLY RATE:
Customer Char e er bill $300.00
Demand Charge (per MDFQ therm $0.384214*
Per Therm Char es
Distribution Charge
Block One: First 250,000 Therms per bill $0.0369401561
Block Two: Next 500,000 Therms per bill $0.04-50400552
Block Three: Over 750,000 Therms er bill $0.00-5400169
Property Tax $0.00041
Total Per Therm Charge
Block One: First 35,000 Therms per bill $0.01602
Block Two: Next 35,000 Therms per bill $0.00593
Block Three: Over 70,000 Therms er bill I IL00210
*Includes Temporary Cost of Gas of($0.05586).
Ousterner Charge: $150 nn per hill
end f harge: $n 26n 1 n as 1 n nor MDFQ+her -,*
Per TherrR ge: RIAnL flee Forst 250,000 therms transnerted @ $() ()2172
13'GGkTwe: ISiext 500,000 therms tre erred n $0 00769
E3'GGk Three: Over 750,000 therms tree erred @ $0 0023669
*Inell ides temporary nUrehased gas nest adjustment of($0 nGGQa)
PURCHASED GAS COST ADJUSTMENT:
This tariff is subject to an adjustment for the cost of purchased gas as provided for in Rate Schedule PGA.
This adjustment is incorporated into the calculation of the Cost of Gas stated on customer bills.
PROPERTY TAX CHARGE:
The Property Tax Charge is applied in accordance with House Bill 329 that was approved in the 2025 state
legislature.
CCU\/1/'`C /'`/1N111IT1/lA1C:
Case No.INT-G-25-02
Issued by: Intermountain Gas Company Exhibit No. 39
By: Lori A. Blattner Title: Director-Regulatory Affairs Page 15 of 17

I.P.U.C. Gas Tariff IDAHO PUBLIC UTILITIES COMMISSION
Rate Schedules Approved Effective
Twent -€eFifth Revised Sheet No. 9 (Page 1 of 2 Sept. 30 —2-n')A ^c!. ?. 2024
Name Per O.N. 36338
of Utility Intermountain Gas Company Monica 13a,,;os_Q�„k,1 coke*M w
tanger's gas supply of the intwstate pipali
to the designated eity gate.
4. .. Thee-us-Wrnersh.- negotiatewith the Company, a mutually agreeable Maximum Daily Firrn Quantit,
anthly Demand Ghwga will be equal GhaFga
im
Case No.INT-G-25-02
Issued by: Intermountain Gas Company Exhibit No. 39
By: Lori A. Blattner Title: Director—Regulatory Affairs Page 16 of 17

I.P.U.C. Gas Tariff IDAHO PUBLIC UTILITIES COMMISSION
Rate Schedules Approved Effective
Fourthl'ifth Revised Sheet No. 9 (Page 2 of 2 n. ,, 2021
Name Intermountain Gas Company ta;
of usrt p Y Y
Rate Schedule T-4
FIRM DISTRIBUTION ONLY TRANSPORTATION SERVICE
(Continued)
SERVICE CONDITIONS:
1. All natural gas service hereunder is subject to the General Service Provisions of the Company's
Tariff, of which this Rate Schedule is a part.
2. This service does not include the cost of the customer's gas supply of the interstate pipeline capacity.
The customer is responsible for procuring its own supply of natural gas and transportation to
Intermountain's distribution system under this Rate Schedule.
3. The customer understands and agrees that the Company is not responsible to deliver gas supplies
to the customer which have not been nominated, scheduled, and delivered by the interstate pipeline
to the designated city gate.
4. The customer shall negotiate with the Company, a mutually agreeable Maximum Daily Firm Quantity
MDFQ). which will be stated in and in effect throughout the term of the service contract.
5. The monthly Demand Charge will be equal to the MDFQ times the Demand Charge rate. Demand
Charge relief will be afforded to those T-4 customers when circumstances impacted by force maieure
events prevent the Company from delivering natural gas to the customer's meter.
BILLING ADJUSTMENTS:
1. In the event that total deliveries to any new T-4 customer did not meet the 200,000 therm threshold
during the current contract period, an additional amount shall be billed. The additional amount shall
be calculated by billing the customer's total usage during that contract period at the Rate Schedule
GS-1 Block 3 rate, adjusted for the cost of gas, and then subtracting the amounts previously billed
during the annual contract period. The customer's future eligibility for the T-4 Rate Schedule will be
renegotiated with the Company.
2. In the event that total deliveries to any existing T-4 customer within the most recent three contract
periods met or exceeded the 200,000 therm threshold, but the customer during the current contract
period used less than the contract minimum of 200,000 therms, an additional amount shall be billed.
The additional amount shall be calculated by billing the deficit usage below 200,000 therms at the T-
4 Block 1 rate. The customer's future eligibility for the T-4 Rate Schedule will be renegotiated with
the Company.
3. In the event the customer requires daily usage in excess of the MDFQ, and subject to the availability
of firm distribution capacity to serve Intermountain's system, all such excess usage will be billed
under rate schedule T-4. Additionally, all excess MDFQ above the customer's contracted MDFQ for
the month will be billed at the monthly Demand Charge rate.
Case No.INT-G-25-02
Z. Harris,IGC
Issued by: Intermountain Gas Company Exhibit No. 39
By: Lori A. Blattner Title: Director—Regulatory Affairs Page 17 of 17
Effective: December 1 202

Preston N. Carter, ISB No. 8462
Megann E. Meier, ISB No. 11948
GIVENS PURSLEY LLP
601 West Bannock Street
P.O. Box 2720
Boise, Idaho 83701-2720
Office: [phone]
Fax: [phone]
[e-mail]
[e-mail]
Attorneys for Intermountain Gas Company
BEFORE THE IDAHO PUBLIC UTILITIES COMMISSION
IN THE MATTER OF THE APPLICATION Case No. INT-G-25-02
OF INTERMOUNTAIN GAS COMPANY
FOR THE AUTHORITY TO INCREASE
ITS RATES AND CHARGES FOR
NATURAL GAS SERVICE IN THE STATE
OF IDAHO
EXHIBIT 40 TO ACCOMPANY THE
DIRECT TESTIMONY OF ZACH HARRIS

I.P.U.C. Gas Tariff
Rate Schedules
Fifteenth Revised Sheet No. 1 (Page 1 of 1)
Name Intermountain Gas Company
of Utility p Y
Rate Schedule RS
RESIDENTIAL SERVICE
APPLICABILITY:
Applicable to any customer using natural gas for residential purposes.
RATE:
Monthly minimum charge is the Customer Charge.
Effective January 1, 2026 Effective January 1, 2027
Customer Charge (per bill $14.00 $20.00
Per Therm Charges
Distribution Charge $0.10782 $0.01400
Property Tax $0.00329 $0.00329
Cost of Gas
1 Temporary Cost of Gas $0.07218 $0.07218
2 Weighted Average Cost of Gas $0.26839 $0.26839
3 Gas Transportation $0.20737 $0.20737
EE Charge $0.01149 $0.01149
Total Per Therm Charge $0.52618 $0.43236
PURHASED GAS COST ADJUSTMENT:
This tariff is subject to an adjustment for the cost of purchased gas as provided for in Rate Schedule PGA.
This adjustment is incorporated into the calculation of the Cost of Gas stated on customer bills.
ENERGY EFFICIENCY CHARGE ADJUSTMENT:
This tariff is subject to an adjustment for costs related to the Company's Energy Efficiency program as
provided for in Rate Schedule EEC-RS. The Energy Efficiency Charge is separately stated on customer bills.
PROPERTY TAX CHARGE:
The Property Tax Charge is applied in accordance with House Bill 329 that was approved in the 2025 state
legislature.
SERVICE CONDITIONS:
All natural gas service hereunder is subject to the General Service Provisions of the Company's Tariff, of
which this rate schedule is a part.
Case No.INT-G-25-02
Z. Harris,IGC
Exhibit No. 40
Issued by: Intermountain Gas Company
By: Lori A. Blattner Title: Director—Regulatory Affairs

I.P.U.C. Gas Tariff
Rate Schedules
Seventieth Revised Sheet No. 3 (Page 1 of 2)
Name Intermountain Gas Company
of Utility
Rate Schedule GS-1
GENERAL SERVICE
APPLICABILITY:
Applicable to customers whose requirements for natural gas do not exceed 2,000 therms per day,at any point
on the Company's distribution system. Requirements in excess of 2,000 therms per day may be allowed at
the Company's discretion.
RATE:
Monthly minimum charge is the Customer Charge.
Customer Charge(per bill $40.00
Per Therm Charges
Distribution Charge
Block One: First 200 Therms per bill $0.11061
Block Two: Next 1,800 Therms per bill $0.09654
Block Three: Next 8,000 Therms per bill $0.08296
Block Four: Over 10,000 Therms per bill $0.04190
Property Tax $0.00329
Cost of Gas
1 Temporary Cost of Gas $0.07113
2 Weighted Average Cost of Gas $0.26839
3 Gas Transportation $0.18889
EE Charge $0.00000
Total Per Therm Charge
Block One: First 200 Therms per bill $0.50005
Block Two: Next 1,800 Therms per bill $0.48598
Block Three: Next 8,000 Therms per bill $0.47240
Block Four: Over 10,000 Therms per bill $0.43134
Case No.INT-G-25-02
Z. Harris,IGC
Exhibit No.40
Issued by: Intermountain Gas Company
By: Lori A. Blattner Title: Director—Regulatory Affairs

I.P.U.C. Gas Tariff
Rate Schedules
Seventieth Revised Sheet No. 3 (Page 2 of 2)
Name Intermountain Gas Company
of Utility
Rate Schedule GS-1
GENERAL SERVICE
(Continued)
For separately metered deliveries of gas utilized solely as Compressed Natural Gas Fuel in vehicular internal
combustion engines.
Customer Charge (per bill $40.00
Per Therm Charges
Distribution Charge
Block One: First 10,00000 Therms per bill $0.08296
Block Two: Over 10,000 Therms per bill $0.04190
Property Tax $0.00329
Cost of Gas
1 Temporary Cost of Gas $0.07113
2 Weighted Average Cost of Gas $0.26839
3 Gas Transportation $0.18889
Total Per therm Charge
Block One: First 10,00000 Therms per bill $0.47240
Block Two: Over 10,000 Therms per bill $0.43134
PURCHASED GAS COST ADJUSTMENT:
This tariff is subject to an adjustment for the cost of purchased gas as provided for in Rate Schedule PGA.
This adjustment is incorporated into the calculation of the Cost of Gas stated on customer bills.
ENERGY EFFICIENCY CHARGE ADJUSTMENT:
This tariff is subject to an adjustment for costs related to the Company's Energy Efficiency program as
provided for in Rate Schedule EEC-GS. The Energy Efficiency Charge is not applicable to gas utilized solely
as Compressed Natural Gas Fuel in vehicular internal combustion engines. The Energy Efficiency Charge is
separately stated on customer bills.
PROPERTY TAX CHARGE:
The Property Tax Charge is applied in accordance with House Bill 329 that was approved in the 2025 state
legislature.
SERVICE CONDITIONS:
All natural gas service hereunder is subject to the General Service Provisions of the Company's Tariff, of
which this rate schedule is a part.
Case No.INT-G-25-02
Z. Harris,IGC
Exhibit No.40
Issued by: Intermountain Gas Company
By: Lori A. Blattner Title: Director—Regulatory Affairs

I.P.U.C. Gas Tariff
Rate Schedules
Twenty-Sixth Revised Sheet No. 4 (Page 1 of 2
Name Intermountain Gas Company
of Utility p Y
Rate Schedule IS-R
RESIDENTIAL INTERRUPTIBLE SNOWMELT SERVICE
APPLICABILITY:
Applicable to any residential customer otherwise eligible to receive service under Rate Schedule IRS who
has added natural gas snowmelt equipment after 6/1/2010. The intended use of the snowmelt equipment is
to melt snow and/or ice on sidewalks, driveways or any other similar appurtenances. Any and all such
applications meeting the above criteria will be subject to service under Rate Schedule IS-R and will be
separately and individually metered. All service hereunder is interruptible at the sole discretion of the
Company.
FACILITY REIMBURSEMENT CHARGE:
All new interruptible Snowmelt service customers are required to pay for the cost of the Snowmelt meter set
and other related facility and equipment costs, prior to the installation of the meter set. Any request to alter
the physical location of the meter set and related facilities from Company's initial design may be granted
provided, however, the Company can reasonably accommodate said relocation and Customer agrees to
pay all related costs.
RATE:
Monthly minimum charge is the Customer Charge.
Effective January 1, 2026 Effective January 1, 2027
Customer Charge (per bill $14.00 $20.00
Per Therm Charges
Distribution Charge $0.10782 $0.01400
Property Tax $0.00329 $0.00329
Cost of Gas
1 Temporary Cost of Gas $0.07218 $0.07218
2 Weighted Average Cost of Gas $0.26839 $0.26839
3 Gas Transportation $0.20737 $0.20737
Total Per Therm Charge $0.51469 $0.42087
PURCHASED GAS COST ADJUSTMENT:
This tariff is subject to an adjustment for the cost of purchased gas as provided for in Rate Schedule PGA.
This adjustment is incorporated into the calculation of the Cost of Gas stated on customer bills.
Case No.INT-G-25-02
Z. Harris,IGC
Exhibit No. 40
Issued by: Intermountain Gas Company/ Page 4 of 11
By: Lori A. Blattner Title: Director—Regulatory Affairs

I.P.U.C. Gas Tariff
Rate Schedules
Twenty-Fifth Revised Sheet No. 5 (Page 1 of 2
Name Intermountain Gas Company
of Utility p Y
Rate Schedule IS-C
SMALL COMMERICAL INTERRUPTIBLE SNOWMELT SERVICE
APPLICABILITY:
Applicable to any customer otherwise eligible to receive gas service under Rate Schedule GS-1 who has
added natural gas snowmelt equipment after 6/1/2010. The intended use of the snowmelt equipment is to
melt snow and/or ice on sidewalks, driveways or any other similar appurtenances. Any and all such
applications meeting the above criteria will be subject to service under Rate Schedule IS-C and will be
separately and individually metered. All service hereunder is interruptible at the sole discretion of the
Company.
FACILITY REIMBURSEMENT CHARGE:
All new interruptible Snowmelt service customers are required to pay for the cost of the Snowmelt meter set
and other related facility and equipment costs, prior to the installation of the meter set. Any request to alter
the physical location of the meter set and related facilities from Company's initial design may be granted
provided, however,the Company can reasonably accommodate said relocation and Customer agrees to pay
all related costs.
RATE:
Monthly minimum charge is the Customer Charge.
Customer Charge (per bill $40.00
Per Therm Charges
Distribution Charge
Block One: First 200 Therms per bill $0.11061
Block Two: Next 1,800 Therms per bill $0.09654
Block Three: Next 8,000 Therms per bill $0.08296
Block Four: Over 10,000 Therms per bill $0.04190
Property Tax $0.00329
Cost of Gas
1 Temporary Cost of Gas $0.07113
2 Weighted Average Cost of Gas $0.26839
3 Gas Transportation $0.18889
Total Per Therm Charge
Block One: First 200 Therms per bill $0.50005
Block Two: Next 1,800 Therms per bill $0.48598
Block Three: Next 8,000 Therms per bill $0.47240
Block Four: Over 10,000 Therms per bill $0.43134
PROPERTY TAX CHARGE:
The Property Tax Charge is applied in accordance with House Bill 329 that was approved in the 2025 state
legislature.
Case No.INT-G-25-02
Z. Harris,IGC
Exhibit No.40
Issued by: Intermountain Gas Company Page 5 of I I
By: Lori A. Blattner Title: Director—Regulatory Affairs

I.P.U.C. Gas Tariff
Rate Schedules
Seventy-Seven Revised Sheet No. 7 (Page 1 of 2
Name Intermountain Gas Company
of Utility p Y
Rate Schedule LV-1
LARGE VOLUME FIRM SALES SERVICE
AVAILABILITY:
Available at any mutually agreeable delivery point on the Company's distribution system to any existing customer
receiving service under the Company's rate schedule LV-1 or any customer not previously served under this schedule
whose usage does not exceed 500,000 therms annually, upon execution of a one-year minimum written service
contract for firm sales service in excess of 200,000 therms per year.
MONTHLY RATE:
Customer Charge(per bill $375.00
Demand Charge (per MDFQ therm $0.44000
Per Therm Charges
Distribution Charge
Block One: First 35,000 Therms per bill $0.02857
Block Two: Next 35,000 Therms per bill $0.01130
Block Three: Over 70,000 Therms per bill $0.00700
Property Tax $0.00329
Cost of Gas
1 Temporary Cost of Gas $0.04807
2 Weighted Average Cost of Gas $0.26839
3 Gas Transportation $0.10403
Total Per Therm Charge
Block One: First 35,000 Therms per bill $0.35621
Block Two: Next 35,000 Therms per bill $0.33894
Block Three: Over 70,000 Therms per bill $0.33464
PURCHASED GAS COST ADJUSTMENT:
This tariff is subject to an adjustment for the cost of purchased gas as provided for in Rate Schedule PGA. This
adjustment is incorporated into the calculation of the Cost of Gas stated on customer bills.
PROPERTY TAX CHARGE:
The Property Tax Charge is applied in accordance with House Bill 329 that was approved in the 2025 state legislature.
SERVICE CONDITIONS:
1. All natural gas service hereunder is subject to the General Service Provisions of the Company's Tariff, of
which this Rate Schedule is a part.
2. The customer shall negotiate with the Company, a mutually agreeable Maximum Daily Firm Quantity
(MDFQ), which will be stated in and in effect throughout the term of the service contract.
3. The monthly Demand Charge will be equal to the MDFQ times the Demand Charge rate. Demand Charge
relief will be afforded to those LV-1 customers when circumstances impacted by force majeure events prevent
the Company from delivering natural gas to the customer's meter.
Case No.INT-G-25-02
Z. Harris,IGC
Exhibit No.40
Issued by: Intermountain Gas Company
By: Lori A. Blattner Title: Director—Regulatory Affairs

I.P.U.C. Gas Tariff
Rate Schedules
Sixth Revised Sheet No. 7 (Page 2 of 2
Name Intermountain Gas Company
of Utility p Y
Rate Schedule LV-1
LARGE VOLUME FIRM SALES SERVICE
(Continued)
BILLING ADJUSTMENTS:
1. In the event that total deliveries to any new LV-1 customer did not meet the 200,000 therm threshold
during the current contract period, an additional amount shall be billed. The additional amount shall
be calculated by billing the customer's total usage during that contract period at the Rate Schedule
GS-1 Block 3 rate, and then subtracting the amounts previously billed during the annual contract
period. The customer's future eligibility for the LV-1 Rate Schedule will be renegotiated with the
Company.
2. In the event that total deliveries to any existing LV-1 customer within the most recent three contract
periods met or exceeded the 200,000 therm threshold, but the customer during the current contract
period used less than the contract minimum of 200,000 therms, an additional amount shall be billed.
The additional amount shall be calculated by billing the deficit usage below 200,000 therms at the LV-
1 Block 1 Distribution Cost rate. The customer's future eligibility for the LV-1 Rate Schedule will be
renegotiated with the Company.
3. In the event the customer requires daily usage in excess of the MDFQ, and subject to the availability
of firm interstate transportation to serve Intermountain's system, all such excess usage will be billed
under Rate Schedule LV-1.Additionally, all excess MDFQ above the customer's contracted MDFQ for
the month will be billed at the monthly Demand Charge rate.
Case No.INT-G-25-02
Z. Harris,IGC
Exhibit No.40
Issued by: Intermountain Gas Company
By: Lori A. Blattner Title: Director—Regulatory Affairs

I.P.U.C. Gas Tariff
Rate Schedules
Twenty-Seventh Revised Sheet No. 8 (Page 1 of 2
Name Intermountain Gas Company
of Utility p Y
Rate Schedule T-3
INTERRUPTIBLE DISTRIBUTION TRANSPORTATION SERVICE
AVAILABILITY:
Available at any mutually agreeable delivery point on the Company's distribution system to any customer
upon execution of a one-year minimum written service contract for interruptible transportation service.
MONTHLY RATE:
Customer Charge (per bill $600.00
Per Therm Charges
Distribution Charge
Block One: First 100,000 Therms per bill $0.03686
Block Two: Next 50,000 Therms per bill $0.01501
Block Three: Over 150,000 Therms per bill $0.00553
Property Tax $0.00041
Temporary Cost of Gas $0.00205
Total Per Therm Charge
Block One: First 35,000 Therms per bill $0.03522
Block Two: Next 35,000 Therms per bill $0.01337
Block Three: Over 70,000 Therms per bill $0.00389
ANNUAL MINIMUM BILL:
The customer shall be subject to the payment of an annual minimum bill based on annual usage of 200,000
therms. The deficit usage below 200,000 therms shall be billed at the T-3 Block 1 rate. An annual minimum
bill will not apply if the customer is a renewable natural gas production facility.
PURCHASED GAS COST ADJUSTMENT:
This tariff is subject to an adjustment for the cost of purchased gas as provided for in Rate Schedule PGA.
This adjustment is incorporated into the calculation of the Cost of Gas stated on customer bills.
PROPERTY TAX CHARGE:
The Property Tax Charge is applied in accordance with House Bill 329 that was approved in the 2025 state
legislature.
Case No.INT-G-25-02
Z. Harris,IGC
Exhibit No.40
Issued by: Intermountain Gas Company
By: Lori A. Blattner Title: Director—Regulatory Affairs

I.P.U.C. Gas Tariff
Rate Schedules
Original Sheet No. 8 Page 2 of 2
Name Intermountain Gas Company
of Utility p Y
Rate Schedule T-3
INTERRUPTIBLE DISTRIBUTION TRANSPORTATION SERVICE
SERVICE CONDITIONS:
1. All natural gas service hereunder is subject to the General Service Provisions of the Company's
Tariff, of which this Rate Schedule is a part.
2. This service does not include the cost of the customer's gas supply or the interstate pipeline capacity.
The customer is responsible for procuring its own supply of natural gas and transportation to
Intermountain's distribution system under this Rate Schedule.
3. The customer understands and agrees that the Company is not responsible to deliver gas supplies
to the customer which have not been nominated, scheduled, and delivered by the interstate pipeline
to the designated city gate.
4. The Company, in its sole discretion, shall determine whether or not it has adequate capacity to
accommodate transportation of the customer's gas supply on the Company's distribution system.
5. If requested by the Company, the customer expressly agrees to immediately curtail or interrupt its
operations during periods of capacity constraints on the Company's distribution system.
Case No.INT-G-25-02
Z. Harris,IGC
Exhibit No.40
Issued by: Intermountain Gas Company
By: Lori A. Blattner Title: Director—Regulatory Affairs

I.P.U.C. Gas Tariff
Rate Schedules
Twenty-Fifth Revised Sheet No. 9 (Page 1 of 2
Name Intermountain Gas Company
of usrt p Y
Rate Schedule T-4
FIRM DISTRIBUTION ONLY TRANSPORTATION SERVICE
AVAILABILITY:
Available at any mutually agreeable delivery point on the Company's distribution system to any customer
upon execution of a one year minimum written service contract for firm distribution transportation service in
excess of 200,000 therms per year.
MONTHLY RATE:
Customer Charge (per bill $300.00
Demand Charge (per MDFQ therm $0.38414*
Per Therm Charges
Distribution Charge
Block One: First 250,000 Therms per bill $0.01561
Block Two: Next 500,000 Therms per bill $0.00552
Block Three: Over 750,000 Therms per bill $0.00169
Property Tax $0.00041
Total Per Therm Charge
Block One: First 35,000 Therms per bill $0.01602
Block Two: Next 35,000 Therms per bill $0.00593
Block Three: Over 70,000 Therms per bill $0.00210
*Includes Temporary Cost of Gas of($0.05586).
PURCHASED GAS COST ADJUSTMENT:
This tariff is subject to an adjustment for the cost of purchased gas as provided for in Rate Schedule PGA.
This adjustment is incorporated into the calculation of the Cost of Gas stated on customer bills.
PROPERTY TAX CHARGE:
The Property Tax Charge is applied in accordance with House Bill 329 that was approved in the 2025 state
legislature.
Case No.INT-G-25-02
Issued by: Intermountain Gas Company Exhibit No.40
By: Lori A. Blattner Title: Director—Regulatory Affairs Page 10 of 11

I.P.U.C. Gas Tariff
Rate Schedules
Fifth Revised Sheet No. 9 (Page 2 of 2
Name Intermountain Gas Company
of usrt p Y
Rate Schedule T-4
FIRM DISTRIBUTION ONLY TRANSPORTATION SERVICE
(Continued)
SERVICE CONDITIONS:
1. All natural gas service hereunder is subject to the General Service Provisions of the Company's
Tariff, of which this Rate Schedule is a part.
2. This service does not include the cost of the customer's gas supply of the interstate pipeline capacity.
The customer is responsible for procuring its own supply of natural gas and transportation to
Intermountain's distribution system under this Rate Schedule.
3. The customer understands and agrees that the Company is not responsible to deliver gas supplies
to the customer which have not been nominated, scheduled, and delivered by the interstate pipeline
to the designated city gate.
4. The customer shall negotiate with the Company, a mutually agreeable Maximum Daily Firm Quantity
(MDFQ), which will be stated in and in effect throughout the term of the service contract.
5. The monthly Demand Charge will be equal to the MDFQ times the Demand Charge rate. Demand
Charge relief will be afforded to those T-4 customers when circumstances impacted by force majeure
events prevent the Company from delivering natural gas to the customer's meter.
BILLING ADJUSTMENTS:
1. In the event that total deliveries to any new T-4 customer did not meet the 200,000 therm threshold
during the current contract period, an additional amount shall be billed. The additional amount shall
be calculated by billing the customer's total usage during that contract period at the Rate Schedule
GS-1 Block 3 rate, adjusted for the cost of gas, and then subtracting the amounts previously billed
during the annual contract period. The customer's future eligibility for the T-4 Rate Schedule will be
renegotiated with the Company.
2. In the event that total deliveries to any existing T-4 customer within the most recent three contract
periods met or exceeded the 200,000 therm threshold, but the customer during the current contract
period used less than the contract minimum of 200,000 therms, an additional amount shall be billed.
The additional amount shall be calculated by billing the deficit usage below 200,000 therms at the T-
4 Block 1 rate. The customer's future eligibility for the T-4 Rate Schedule will be renegotiated with
the Company.
3. In the event the customer requires daily usage in excess of the MDFQ, and subject to the availability
of firm distribution capacity to serve Intermountain's system, all such excess usage will be billed
under rate schedule T-4. Additionally, all excess MDFQ above the customer's contracted MDFQ for
the month will be billed at the monthly Demand Charge rate.
Case No.INT-G-25-02
Z. Harris,IGC
Exhibit No.40
Issued by: Intermountain Gas Company Page 11 of 11
By: Lori A. Blattner Title: Director—Regulatory Affairs