20210924Application.pdf

A INTERMOUNIAIN'
RECEII'ED
2021 September 24, PM l:49
IDAHO P(IBLIC
I IT I I- IT I ES COM lIT I SS I O N
RE
GAs COMPANYAgiffiydrfiilWrEdop,fi.
lnfrre@mrunltyto*nE
September 24,2021
Ms. Jan Noriyuki
Commission Secretary
Idatro Public Utilities Commission
P.O. Box 83720
Boise,lD 83720-0074 tNT- &-J.r- or
Intermountain Gas Company
TariffAdvice No. 2l-01
Dear Ms. Noriyuki:
Enclosed for filing with this Commission is a copy of Intermountain Gas Company's
("Intermountain" or "Company") proposed revisions to Section C of its General Service Provisions.
The proposed edits to Section C are presented in Attachment No. 1. The resulting proposed Section
C is presented in Attachment No. 2.
The proposed revisions outlined below are in line with Commission Order No. 34735 in Case No.
INT-G-20-01 which authorizes the Company to "file an annual tariff advice to update the Allowable
Investment Factors, the Service Line Cost per Foot, and the construction overhead charge." Order
No. i4735 at 9.
l. The update to the Allowable Investrnent Factors in section 4.3 includes changes in the
compound inflation factor and in the depreciation lives of various distribution plant
accounts.
The compound inflation factor was updated to include inflation data for June 2019 -
December 2020. The Company adjusts for inflation the embedded costs from its last
general rate case (Case No. INT-G-16-02) to help ensure that new applicants are treated the
same as existing customers in terms of the amount of facilities their Allowable Investrnent
will cover.
The depreciation lives of various distibution plant accounts used in the calculation of the
Allowable Investment Factors were updated to reflect the Company's recently approved
settlement of its depreciation rates (Case No. INT-G-21-01, Order No. 35134).
The calculation of the proposed Allowable Investnent Factors, including the adjustments
discussed above, is shown in Attachment No. 3.
A INTERMOUNIAIN'
GAS COMPANYASUWy otttlw f,feu[fE eup, ht.
lntheCommunltytoSerw'
2. The update to its service line cost per foot in section 5.2 is based on a new three-year
average of service lines costs divided by the feet installed during the same years. The
proposed three-year average service line cost per foot is shown in Attachment No. 4.
3. The change in the constuction overhead rate in section 5.3(c) reflects the Company's
currently calculated rate.
In addition to the regular revisions outlined in Order No. 34735, Intermountain proposes the
following changes to provide additional clarity to the tariff.
4. To avoid possible confusion, the Company proposes a change to section 4.2(a) to remove
the ambiguous reference to "Non-discretionary load" and replace it with the word "Gas".
5. The Company proposes to remove the reference to "stubs" in section 5.3 because sfubs are
not included in the main project cost estimate. Stub costs are included in the average
service line cost per foot referenced in section 5.2.
The Company requests that the proposed revisions become effective one month after Commission
approval to give the Company enough time to implement the changes to its systems and forms.
Therefore, the Company proposes a Commission approval date of November 1,2021and an
effective date of December 1,2021.
If you have any questions or require additional information regarding the attached, please contact me
at [phone].
Wnsbw
Lori A. Blattner
Director - Regulatory Affairs
Intermountain Gas Company
Enclosures
Mark Chiles
Preston Carter
cc
Attachment No. 1
TariffAdvice No. 21-01
lntermountain Gas Company
Page 1 of 2
LP.U.C. Gas Tariff
Section C
Third Revised F0Uilh Sheet No. 3
Narn6
of Utilaty Intermountain Gas Company
IDAHO PUBLIC UTILITIES COMMISSIONApproved EffectiveSeet#,4eze es+.<#re
Per e,N, 3t1735
Jan Noriyuki Secrctary
construction within six months of the date of the contract.
3.2 Relocation or abandonment of Company owned Gas Facilities will be at the expense of the
applicant when required by the applicant.
3.3 The applicant may be required to reimburse the Company for the installation, extension, or
abandonment of Gas Facilities if the terms of the signed agreement are not met.
3.4 The applicant shall indemni! and hold the Company harmless from liability for access for routine
maintenance, inspections, and emergencies, or for injury to property caused by the installation
of a Service.
3.5 The Company will install a single Service per applicant, unless the applicant requests an
additional Service. The Company may provide an additional Service on a case-by-case basis,
provided there is over one-hundred-feet between meter locations. Each Service must follow the
provisions of this section. The Company may waive the one-hundred-foot requirement when an
additional Service is required for Multifamily or lnteruptible Snowmelt Service (Rate Schedules
lS-R and ISC).
4. ALLOWABLEINVESTMENT
4.1 The Allowable lnvestment for Services and Mains is determined by first calculating the estimated
annual therm usage and then applying the Allowable lnvestment Factor per therm.
4.2 The estimated annual therm usage is calculated as follows:
(a) For residential applicants:
\Men natural gas is the primary heat source, calculate the estimated annual space heating
therm usage by multiplying the square foot factor of 0.234 by the square footage of the home.
Gas
To the estimated annual space heating therm usage, add gas appliance annual therm usage
estimates from the chart below, as applicable, to calculate the total estimated therm usage
per year. llen+ieerefieaery-Oae appliances not on this list can be estimated by the Company
on a case-by+ase basis. ln residential Developments where specific appliances are
unknown at the time of calculation, the Company will base therm estimates on only the
estimated annual space heating therm usage plus the water heater therm estimate.
Natural Gas Appllances Annual Therm
Estimates
Ranoe 23
Seasonal Fireolace 50
crill 't5
Clothes Drver 28
Water Heater 240
rssued by: lntermountain Gas Company
Blattner . --Title: Director-RegulatoryAffairs
December 1. 2021
|.P.U.C. Gas Tariff
Section C
+nirel Revised l-Ouflh Sheet No.4
Name
of Utility lntermountain Gas Gompany
Attachment No. 1
Tariff Advice No.21-01
Intermountain Gas Company
Page 2 ot 2
IDAHO PUBLIC UTILITIES COMMISSIONApproved EffectiveSee+#,+e3e esHr*fe
Per e-N- 31735
Jan Noriyuki Secretary
(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 lnvestment per applicant, multiply the estimated annual therm usage
per applicant by the applicable Allowable lnvestment Fastor below to calculate the Allowable
lnvestment in dollars:
Allowable lnvestnent Factors
Gustomer Type Seruice Main Combined
Residential 0.612 e5e3 0.674 es6e 1.286 ffi
Commercial 0.459 w 0.505 ffi 0.964 0€4e
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 lnvestment.
4.5 The Company may calculate the Allowable lnvestment for applicants with structures or business
operations which are non-permanent on a case-by-case basis.
5. PROJECTCOST
5.1 ln the event the Company can defay any of the trench and backfill costs, for example by sharing
a trench with other utilities, the cost reduc{ion 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
lenqth bv $43t8 per foot.- '$13.66
5.3 The Main Extension Project Cost estimate is based on the Gas Facilities (excluding Services)
required to serve the gas load of the requesting applicant. This includes but is not limited to
Main, regulator stations, valves, stubs and Main fittings.
(a) The Company will provide a Project Cost estimate to the applicant prior to execution of an
agreement.
(b) The estimate will exclude costs for Company Betterment.
(c) The Company includes construction overhead charges in the amount s1 449t1r.9.920/o
(d) The Main extension Project Cost will be divided by the number of estimated Service Points
to calculate the Main extension Project Cost per applicant.
r$ued by: lntermountain Gas Company
By: Lori A. Blattner . -^f[le: Direc{or - Regulatory Affairs
Eiteaive: e€1gb€r-t_?gee December 1. 2021
l.P.U.C. Gas Tariff
Section C
Fourth Revised Sheet No.3
Name
of Utility lntermountain Gas Company
Attachment No. 2
TariffAdvice No.21-01
lntermountain Gas Company
Page 1 ot2
construction within six months of the date of the contract.
3.2 Relocation or abandonment of Company owned Gas Facilities will be at the expense of the
applicant when required by the applicant.
3.3 The applicant may be required to reimburse the Company for the installation, extension, or
abandonment of Gas Facilities if the terms of the signed agreement are not met.
3.4 The applicant shall indemnify and hold the Company harmless from liability for access for routine
maintenance, inspections, and emergencies, or for injury to property caused by the installation
of a Service.
3.5 The Company will install a single Service per applicant, unless the applicant requests an
additional Service. The Company may provide an additional Service on a case-by-case basis,
provided there is over one-hundred-feet between meter locations. Each Service must follow the
provisions of this section. The Company may waive the one-hundred-foot requirement when an
additional Service is required for Multifamily or lnterruptible Snowmelt Service (Rate Schedules
lS-R and lS-C).
4. au-omBLEtNvEsritENT
4.1 The Allowable lnvestment for Services and Mains is determined by first calculating the estimated
annual therm usage and then applying the Allowable lnvestment Factor per therm.
4.2 The estimated annualtherm usage is calculated as follows:
(a) For residential applicants:
\trhen natural gas is the primary heat source, calculate the estimated annual space heating
therm usage by multiplying the square footfactorof 0.234 by the square footage of the home.
To the estimated annual space heating therm usage, add gas appliance annualtherm usage
estimates from the chart below, as applicable, to calculate the total estimated therm usage
per year. Gas appliances not on this list can be estimated by the Company on a case-by-
case basis. !n residential Developments where specific appliances are unknown at the time
of calculation, the Company will base therm estimates on only the estimated annua! space
heating therm usage plus the water heater therm estimate.
Natura! Gas Appliances Annual Therm
Estimates
Ranqe 23
Seasonal Fireplace 50
Grill 15
Clothes Drver 28
Water Heater 240
tssued by: lntermountain Gas Compa
By: Lori A. Blattner Title:
Effective: December 1, 2021
ny
Director - Regulatory Affairs
LP.U.C. Gas Tariff
Section C
Fourth Revised Sheet No.4
Name
of Utility Intermountain Gas Company
Attachment No. 2
TariffAdvice No.2'l-01
lntermountain Gas Company
Page 2 ol 2
(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
propefi type, and applicable gas appliances.
4.3 To determine the Allowable lnvestment per applicant, multiply the estimated annual therm usage
per applicant by the applicable Allowable lnvestment Factor below to calculate the Allowable
lnvestment in dollars:
Allowable lnvestment Factors
Customer Type Seruice Main Combined
Residential 0.612 o.674 1.286
Commercial 0.459 0.505 0.964
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 lnvestment for applicants with structures or business
operations which are non-permanent on a case-by+ase basis.
5. PROJEGTCOST
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 $13.66 per foot.
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 willexclude costs for Company Betterment.
(c) The Company includes construction overhead charges in the amount of 9.92%
(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.
rssued by: Intermountain Gas Company
By: Lori A. Blattner Title: Director - Regulatory Affairs
Effec{ive: December 1, 2021
Attachment No. 3
TariffAdvice No.21-01
lntermountain Gas Company
Page 1 of4
Line No.
INTERMOUNTAIN GAS COMPANY
Line Extension Allowable lnvestnent Factots
Dsscdplion R6sidential Commercial
40
55
70
43
$
1
2
3
4
5
6
7
8
9
10
11
72
13
74
15
16
17
18
19
20
27
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
(a)
Sarvlca3 Allowrblc lny.3tmcnt Frc{ot
Ssrvice Line Extonsion Emboddad Cost p6r Them:
FERC Account 38ol1l
FERC Account 38512t
Total
+Year Compound lnflation Factofl
Servie Lino Extension Embedded Cost por Therm (Line 5 times Line 6)
Weighted Ass6t Life:
FERC Account 380 - Asset Lifet'l
FERC Account 38O - Embedded Cost per fhermlll
Woighting Factor (Lin€ 9 times Line 10)
FERC Account 385 - Asset Lifeltl
FERC Account 385 - Embedded Cost per therml2l
Weighting Faclor (Lim 12 times Lina 13)
Weighted Asset Life (Sum ol Lines 1 l and 14 divided by Line 5)
Weighted AvoEge Cost of Capitallq
Soruicos Allorabl€ lnvestment Factor ($/therm)o
@
Main LinE Exension Emb€ddad Cost psr Therm:
FERC Account 374lEl
FERC Account 376lel
FERC Account 378l1ol
Total
4-Y6ar Compound lnflation Facto/el
Main Line Extension Emb€dded Cost per Therm (Line 23 times Lino 24)
Weighted Asset Life:
FERC Account 374 - Asset Lifelrll
FERC Account 374 - Embedded Cost per Therml8l
Weighting Factor (Lin€ 27 times Line 28)
FERC Account 376 - Asset Lifeltrl
FERC Account 375 - Embedded cost per Thermlel
Weighting Factor (LinE 30 tim6s Line 31)
FERC Account 378 - Asset Lifetr3l
FERC Account 378 - Embedded Cost per Thermllol
Weighting Faclor (Line 33limes Lim 34)
(b)(c)
t 0.039146
0.002953
s oo42o99
108.1%
$0.M55 t7
58 58
s 0.039146 s 0.0293502.270451 1.702275
s 0.002953
s 0.029350
o.oo2214s 0031564
108.1%
$ 0"034116
40
0.088564
, 0.oo2214
0
0.1 18125
56.7
7.300h
0.612
56.7
7.30%
0.459t
$s 0.000125
0.032386
0.001874
T 0"01438s
108.1%s 0.049585 $ 0.037176
0.000167
0.043't95
0.002499
s 0.045862
108.1%
s 0.fr)0167
56
0.000125
70
0.032385
0.009367 0.007023
s 0.M3195
3.023646 2.256998
I 0.m2499 s 0.001874
43
Wsighted Assst Life (Sum of Lines 29, 32 and 35 divided by Line 23)
Waighted Averag6 Cost of Capitall6l
Mains Allwable lnvestmont Faclor (t^herm)lr'l
NOTES
trlS6 Attachment No. 3, Pags 3, Lines 6 and 18, Column (g)
l2lSm Attachment No. 3, Page 3, Line6 11 and 23, column (g)
BlSe6 Attachmant No. 3, Page 4, Line 5, Column (n)
14 See Attacfiment No. 3, Page 3, Linos 6 and 18, Column (b)
FlSeo Attachmont No. 3, Page 3, Linos 'l 1 and 23, Column (b)
t4Case No. INT€-I642, Ord3r No. 33757
m The present valua of Lin€ 7 discounlsd by th€ weighted ayerage cost of epital on Lino 16 over the wsightsd life of
lh€ assgts on Line 1 5
FlSe Attachment No. 3, P.ge 3, Linos 2 and 14, column (g)
0 Sse Attachmsnl No. 3, Page 3, Lanes 4 and 16, Column (9)
l!0lSee Attachment No. 3, Page 3, Linss 5 and 17, column (g)
ItrlSe Attachmgnt No. 3, Page 3, Lines 2 and 14, Cotumn (b)
Ii4 Ss Attachment No. 3, Page 3, Lines 4 and '16, cotumn (b)
11$ See Attachment No. 3, Pags 3, Linss 5 and 17, cotumn (b)
114 The prcsent value of Line 25 dascountod by the weighted avorago cost ot capital on Line 37 ovor th€ weight€d lile of
the assots on Line 36
o.to7475
68.5
7.30o/o
0.574 $
0.080579
68.5
7.30%
0.505
Line No.
INTERiIOUNTAIN GAS COMPANY
Glass Line Extenslon Embedded Costs
Description Total Company
Attachment No. 3
TariffAdvice No.2l-0'l
lntermountain Gas Company
Page 2 ot 4
CommercialResidential
(a)
Llm Ext n.lon Cost3 Embedded ln Current Rat6
Ca3e No. INT-G1&02 Commission Ordered Deprecidionlll
Case No. INT-G1S02 Commission Ordercd Operating lncome al7.3o/ol1l
Tax Gross.UpPl
Line Extension Emb€dd€d Co3E (Sum of Lines 2 - 4)
Cae€ No. INT€-1&02 Proposed Distribulion Rate Baset3l
Caee No. INT&1&02 Commission Ordered Rate Baselll
PropGed Distribution Rat€ Ba3e Percentag€ (Line 7 divided ry Line 8)
Case No. INT-G-1&02 Class Basa Revenue Requirementtal
Case No. lNT6-1&02 Total Base Revenue Requirementlll
Class Bage Rovenu€ Roquirefirent Percentage (Line '10 divided by Line 1 1)
13 Class Line Extercion Embedded Costsrsl
6
7
I
I
(b)
$ 20,859,316
17,193,456
6,3't 8,423s 44,371,195
$ 1E7,838,950
235,526,78E
79.750/o
(c)
57,675,297
89,376,2U
(d)
22,067,933
89,376,254
10
11
12
$$
64.53o/o 24.690/o
!393v! !JZg!93,
]{OTES
lrlOrder No. 33757, Attachm€ntA
PlThe Tax Gros+Up was comput€d using the gro$ revenue conveBion fiactor hom Cas€ No. GNR-u-1&Ol, Exhibit No. 5
t3lCase No. INT€-1&O2, Exhibit No.20, Page 3
ttl order No. 337 57, 2nd Err€l:€
IslLine 5, Column (b) times Une 9, Column (b) tirn$ Line 12 Cdumm (c) and (d), r$poctiv6ly.
Attachment No. 3
TariffAdvice No.21-01
lntermountain Gas Company
Page 3 of4
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Attachment No. 3
TarifiAdvie No.21-01
lntermountain Gas Company
Page 4 of4EEEEE*sss8otrq\i
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Attacfiment No. 4
TarifiAdvie No.2'l-01
I ntarmountain Gas Company
Page 'l of 1
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