20191119PAC to Staff 1-7.pdf

ROCKY MOUNTAIN
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A OTVTSTON OF PACTFTCOFP
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.0l9li0\/ l9 PH 5: 20 1407 W North Temple, Suite 330
Salt Lake City, Utah 84'l'16
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Diane Hanian
Idaho Public Utilities Commission
472 W. Washington
Boise, ID 83702-5918
[e-mail] (c)
RE ID PAC.E.19-15
IPUC lst Set Data Request (l-7)
Please find enclosed Rocky Mountain Power's Responses to IPUC lst Set Data Requests l-7.
Also provided are Attachments IPUC 1.6 and 1.7.
Ifyou have any questions, please feel free to call me at [phone].
Sincerely,
---J"l-J. Ted Weston
Manager, Regulation
Enclosures
November 19,2Ol9
PAC-E-l9- l5 / Rocky Mountain Power
November 19,2019
IPUC l't Set Data Request I
IPUC Data Request I
Please describe any physical change to an existing primary or secondary
distribution customer's tervice needed to accommodate Schedule No. 3l - Partial
Requiranents Seruice.
Response to IPUC Data Request I
The Company does not anticipate that any physical changes are required to the
facilities directly serving an existing primary or secondary voltage customer when
it takes service on Schedule 31.
Recordholder: Robert Meredith
Sponsor: Ted Weston
PAC-E-19-15 / Rocky Mourtain Power
November 19,2019
IPUC l"t Set Data Request 2
IPUC Data Request 2
Please explain the basis and methodology used to determine the new Schedule
No. 3l primary and secondary distribution service rate design as it pertains to
each of the following:
(a) Customer Service Charge;
(b) Back-up Facilities Rate;
(c) Back-up Power Rate;
(d) Excess Power Rate;
(e) S upplernentary Power Rate;
(f) Supplementary and Back-up Energy Rate; and
(g) Scheduled Maintenance Power Rate.
Response to IPUC Drtr Request 2
The basis for the proposed primary and secondary Schedule 31 rates for
distribution service is consistent with the logic that was applied to develop
transmission voltage rates for Schedule 31 . The transmission rates were based on
Schedule 9 and the distribution rates are based on Schedule 6.
(a) Like prices for transmission voltage, the basic charge was set at the same level
as the otherwise applicable full requironents rate schedule which for
distribution voltage is Schedule 6.
(b) Like prices for transmission voltage, the Back-up Facilities prices were set to
recover the unit costs for dernand-related transmission function and l3 percent
ofdemand-related generation from the cost of service study in the last rate
case (Docket No. PAC-E-l l-12). Also like prices for transmission voltage,
the Back-up Facilities Rate was segrnented into Summer and Winter prices
that reflect the same relative differential between both seasons as exists in the
Power Rate for the otherwise applicable full requirernents rate schedule
(Schedule 6 for primary and secondary voltages). To reflect the additional
fixed facilities that are required to provide service to distribution voltage
customers, the proposed rates also included unit costs for distribution line
transformers, distribution substations and distribution poles and conductor
from the cost of service study in the last rate case (Docket No. PAC-E-1 1-12).
To account for the lower cost ofproviding service to primary voltage
customers, the proportion ofthe secondary Back-up Facilities Rate relative to
the Schedule 6 Power Rate was applied to the $0.65 Primary Voltage
Discount included in Schedule 6 and was then deducted fiom the Back-up
Facilities Rate to produce a price for primary voltage.
(c) Like prices for transmission voltage, the Back-up Power Rate was set such
that a partial requirements customer whose self-generation was offline for the
whole month would pay the same for both the Back-up Facilities Rate and the
Back-up Power Rate as a full requirements customer would for the Power
Rate
PAC-E-19-15 / Rocky Mountain Power
November 19,2019
IPUC I't Set Data Request 2
(d) Like prices for transmission voltage, the Excess Power Rate was set at two
times the Power Rate on the otherwise applicable fiill requirernents rate
schedule (Schedule 6 for primary and secondary voltages).
(e) Like prices for transmission voltage, the Supplementary Power Rate was set at
the same level as the Power Rate on the otherwise applicable full requirernents
rate schedule (Schedule 6 for primary and secondary voltages).
(f) Like prices for transmission voltage, the Supplementary and Back-up Energy
Rate was set at the same level as the Energy Rate on the otherwise applicable
full requiranents rate schedule (Schedule 6 for primary and secondary
voltages).
(g) Like prices for transmission voltage, the Scheduled Maintenance Power Rate
is set at one halfofthe Back-up Power Rate.
Recordholder: Robert Meredith
Sponsor: Ted Weston
PAC-E-19-15 / Rocky Mountain Power
November 19,2019
IPUC ls' Set Data Request 3
IPUC Data Request 3
Please explain how the primary and secondary distribution service rate desigrr
differs from hansmission level service under Schedule 31.
Response to IPUC Data Request 3
Please refer to the Company's response to IPUC set I data response 2.
Recordholder: Robert Meredith
Sponsor: Ted Weston
PAC-E-19-15 / Rocky Mountain Power
November 19,2019
IPUC 1"t Set Data Request 4
IPUC Data Request 4
Please explain how the primary and secondary distribution service rate design is
t}re same as transmission level service under Schedule 31.
Response to IPUC Data Request 4
Please refer to the Company's response to IPUC Set 1 data response 2.
Recordholder: Robert Meredith
Sponsor: Ted Weston
PAC-E-19-15 / Rocky Mountain Power
November 19,2019
IPUC lst Set Data Request 5
IPUC Data Request 5
Please explain how the change to Schedu'le 3l will affect other customers both in
the customer class and outside the customer class.
Response to IPUC Data Request 5
The Company's proposed changes to Schedule 31 will enable larger distribution
voltage customers to receive partial requirements service under the same general
provisions and rate design as is available currently for transmission voltage
customers, In general rate cases, the Company does not include partial
requirernents customers in its cost ofservice studies, but instead applies the
revenue from partial requirements as a reverue credit to benefit all full
requirements customers and to reflect the cost ofproviding service to partial
requirernents customers. The Company does not therefore believe that its
proposed tariff changes will have any material adverse consequences for other
customers.
Recordholder: Robert Meredith
Sponsor: Ted Weston
PAC-E- l9- I 5 / Rocky Mountain Power
November 19,2019
IPUC 1't Set Data Request 6
IPUC Data Request 6
Please provide the workpapers, with all formulas intact, used to determine the rate
design changes for the primary and secondary distribution service excess power
rate and the scheduled maintenance power rate.
Response to IPUC Data Request 6
Recordholder: Robert Meredith
Sponsor: Ted Weston
The Company provided work papers with all formulas intact as Attachment A to
the application. For convenience please refer to Attachment IPUC 1.6 which is a
copy of those work papers.
PAC-E-I9-15 / Rocky Mountain Power
November 19,2019
IPUC l"t Set Data Request 7
IPUC Data Request 7
Please provide an example contract to be used by the Company for providing new
primary and/or secondary distribution service under Schedule No. 31 .
Response to IPUC Data Request 7
Please see Attachment IPUC I .7.
Recordholder: Eric Holje
Sponsor: Ted Weston