20190926PAC to Staff 13-17.pdf

ROCKY MOUNTAIN
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REC EIVED
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1407 W North Temple, Suite 330
Salt Lake City, Utah 84116
September 26,2019
Diane Hanian
Idaho Public Utilities Commission
472W. Washington
Boise,ID 83702-5918
diane.holt@,puc. idaho. eov (C)
RE: ID PAC-E-19-08
IPUC 2"d Set Data Request (13-17)
Please find enclosed Rocky Mountain Power's Responses to IPUC 2nd Set Data Requests l3-17.
Also provided are Attachments IPUC 13 and 14.
If you have any questions, please feel free to call me at [phone].
Sincerely,
___Jsl-
J. Ted Weston
Manager, Regulation
Enclosures
C.C.: Eric L. Olsen/IIPA elo(@echohawk.com
Anthony Yankel/IPA [e-mail]
PAC-E-19-08 / Rocky Mountain Power
September 26,2019
IPUC ls Set Data Request l3
IPUC Data Request 13
On page 6 of the Application, the Company states that approximately 820
customers currently participate under Schedule 135. For each Schedule 135
Customer who was connected to Rocky Mountain Power for the entire period
between January 1,2018 and Decernber 31, z}l8,please provide the following
information:
(a) The schedule under which the net metering customer takes power;
(b) The County in which the customer is located; and
(c) Net hourly consumption/production data for the 2018 calendar year
Response to IPUC Data Request 13
(a) Please refer to Attachment IPUC 13.
(b) Please refer to Attachment IPUC 13.
(c) The Company does not have the requested data for existing Schedule 135 Net
Metering customers, for new net Billing customers on Schedule 136 the
Company would install meters with the capability to measure consumption
and production data. To provide as much information as possible responsive
for this request, Attachment IPUC 13 contains the billed kilowatt-hours
(kwh), delivered kWh and exported kWh and customer generation kW
capacity size for each customer who was served on Schedule 135 for the
entire period between January 1,2018 and December 31, 2018 and is
currently still on Schedule 135.
Record holder:
Sponsor:
James Zhang
Robert Meredith
PAC-E-19-08 / Rocky Mountain Power
September 26,2019
IPUC l't Set Data Request 14
IPUC Data Request 14
Please provide the 2009 Analysis of System Losses for Idaho referred to by
Company Witness MacNeil on pages 5 and 6 of his direct testimony.
Response to IPUC Data Request 14
Please refer to Attachment IPUC 14.
Recordholder: Robert Meredith
Sponsor: Robert Meredith
PAC-E-19-08 / Rocky Mountain Power
September 26,2019
IPUC 1't Set Data Request l5
IPUC Data Request 15
For each class that would be able to export energy under the Company's proposed
Schedule 136, please provide a general description of the functions of the meter(s)
that would be used under the Company's Net Billing Program. Please include the
following information:
(a) The rate (monthly, hourly, by minute, etc) at which the meter can store
consumption data;
(b) If the meter includes separate registers for recording imports and exports; and
(c) If the meter is capable of measuring and recording demand.
Response to IPUC Data Request 15
(a) The meter monitors and records consumption data, updating the register every
time one metered kilowatt-hour (kWh) is recorded.
(b) The meter has separate registers for recording imports and exports.
(c) The meter is capable of measuring and recording dernand.
Recordholder: June Sabbah
Sponsor: Robert Meredith
PAC-E-I9-08 / Rocky Mountain Power
September 26,2019
IPUC I't Set Data Request 16
IPUC Data Request 16
In the response to StaffProduction Request question 2 (d), the Company provided
the'oannual exported energy by customer" in an Attachment called IPUC 2.
Please clarifu if the column labeled'Net Mtrng Generation Kw" represents
annual exported energy as suggested in the PR response, or if it is total generation
as it is labeled.
Response to IPUC Data Request 16
Referencing the Company's response to IPUC Data Request 2, specifically
Attachment IPUC 2,the column labeled "Net Mtrng Generation Kw" represents
the net metering customer's generation nameplate capacity size in kilowatts (kW).
The Company does not have the requested information about how much energy
each customer-generator generates.
Recordholder:
Sponsor:
James Zhang
Robert Meredith
PAC-E-I9-08 / Rocky Mountain Power
September 26,2019
IPUC 1$ Set Data Request l7
IPUC Data Request 17
Please describe how the integration cost, assumed in the 2017 IRP, is
representative ofactual costs to integrate Schedule 135 solar exports. Please
include all calculations to demonstrate how exported generation correlates with
the proposed integration charge of $0.64lMWh.
Response to IPUC Data Request 17
The solar integration costs in the2017 Integrated Resource Plan (IRP) Flexible
Reserve Study (Volume II, Appendix F) represent the cost of keeping flexible
resources available to compensate for variations in solar output. The output of
solar resources varies throughout each day due to cloud cover, changes in the
position of the sun, and other weather conditions.
As the sun sets or a cloud passes over, the Company must have resources
available to deploy to compensate for the reduction in output so as to maintain the
reliable operation of its system. The portion of resources that is withheld for this
purpose cannot be used to serve load or support wholesale sales, so higher cost
generation or market purchases may need to be used to serve load, or the
Company might forgo economic wholesale sales opportunities. The difference in
dispatch cost between the flexible resource that is held back and the alternative
resource or market transaction that is used to balance load is the integration cost.
The flexible reserye study in the 2017 IRP determines aggregate flexible
requirements for all sources of variability, including load, wind, solar, and non-
variable generation. When all of these sources are considered, deviations of
different sources can offset, and are rarely maximized simultaneously. This results
in lower requirements for all sources of variability.
Table F.12 in the Flexible Reserve Study shows the forecasted regulation reserve
for incremental solar: 3.6 percent to 3.8 percent of nameplate capacity, depending
on the scenario. When this is spread across the entire modeled solar generation, to
derive a dollars per megawatt-hour ($/MWh) rate, the result is a relatively small
value.
The Company has not specifically calculated the variability specific to Schedule
135 export resources. However, the Company believes using the integration cost
from the 2017 IRP is a reasonable approximation for exported energy from small
customer-generators.
Recordholder:
Sponsor:
Dan MacNeil
Dan MacNeil