20240826AVU to Staff 9C_11C_23C_24C_27C Conf.pdf

RECEIVED
Monday,August 26,2024
IDAHO PUBLIC
AVISTA CORPORATION UTILITIES COMMISSION
RESPONSE TO REQUEST FOR INFORMATION
JURISDICTION: IDAHO DATE PREPARED: 08/19/2024
CASE NO: AVU-E-24-07 WITNESS: Kevin Holland
REQUESTER: IPUC RESPONDER: Xin Shane
TYPE: Production Request DEPARTMENT: EIM Settlement
REQUEST NO.: Staff—009C TELEPHONE: [phone]
REQUEST:
Please respond to the following regarding the EIM benefits:
a. Please provide the dollar value of EIM benefits;
b. Please explain how the dollar values of EIM benefits are determined;
c. Please explain whether the methodology that determines EIM benefits is approved by the
Commission; and
d. Please provide evidence showing that EIM O&M included in the PCA does not exceed
EIM benefits.
RESPONSE:
Please note this response contains TRADE SECRET, PROPRIETARY or CONFIDENTIAL
information and exempt from public view and is separately filed under IDAPA 31.01.01,Rule 067
and 233, and Section 9-340D, Idaho Code.
a. The total EIM benefit for the PCA review period, July 2023 to June 2024, is $18.6 million
system. Please refer to Staff PR 009C Confidential Attachment A for monthly detail.
b. The EIM benefit calculation process follows our internal method that was documented
back in 2022. Please refer to Staff_PR_009C Confidential Attachment B for detailed
information. This was provided to the Commission as part of a compliance filing in Case
No. AVU-E-22-11 on October 11, 2022. In that Case No., the Commission issued Order
No. 35543 stating the Company's October 11, 2022 report on its method for measuring
EIM benefits and how that method differs from CAISO's method complies with Order No.
35543.
c. See part b above.
d. The total EIM O&M for the PCA review period, July 2023 to June 2024, is approximately
$1.1 million system ($380,000 Idaho share), which is considerably less than the $18.6
million system provided in response to part a.

RECEIVED
Monday,August 26,2024
IDAHO PUBLIC
AVISTA CORPORATION
UTILITIES COMMISSION
RESPONSE TO REQUEST FOR INFORMATION
JURISDICTION: IDAHO DATE PREPARED: 08/22/2024
CASE NO: AVU-E-24-07 WITNESS: Kevin Holland
REQUESTER: IPUC RESPONDER: Annette Brandon
TYPE: Production Request DEPARTMENT: Energy Supply
REQUEST NO.: Staff-0I I C TELEPHONE: [phone]
REQUEST:
Page 14 of Holland's Direct Testimony states that "Avista shareholders absorbed approximately
$700,000 in carbon expense for the sales benefit."Please respond to the following:
a. Please explain how the $700,000 is calculated and provide workpapers for the calculation.
b. Is the $700,000 based on the expenses associated with CCA allowance purchases,
regardless of whether the allowances are retired to meet the CCA target?
c. Is the $700,000 only associated with Idaho's allocation of off-system sales or does it
include Washington's allocation of the off-system sales? Please explain.
RESPONSE:
Please note this response contains TRADE SECRET, PROPRIETARY or CONFIDENTIAL
information and exempt from public view and is separately filed under IDAPA 31.01.01,Rule 067
and 233, and Section 9-340D, Idaho Code.
Please note, this portion of testimony was intended to illustrate the impact of the Idaho
Commission not allowing expenses associated with CCA to flow through the PCA. The$700,000
is illustrative in the amount of $700,000 for the 2023 calendar year. In accordance with
Commission directives, no expenses are included in the PCA in 2023 or in 2024.
Please see the following responses regarding surplus thermal generation:
a. Please see Staff_PR_011 C Confidential Attachment A for the calculation of the $700,000.
Please note this represents a rounded number, with the actual calculated number of
$662,437. The calculation is based on actual Boulder Park Generation(Idaho's share) and
the allowance end of month (EOM) market price. This generation is reflected on column
(H) of the attachment, prices are reflected in column(F).
b. Expense is calculated based on obli ag tion incurred during the month (in accordance with
matching principle). Please see response to part (a).
c. Please see the response to part(a).

RECEIVED
Monday,August 26,2024
AVISTA CORPORATION IDAHO PUBLIC
RESPONSE TO REQUEST FOR INFORMATION UTILITIES COMMISSION
JURISDICTION: IDAHO DATE PREPARED: 08/23/2024
CASE NO: AVU-E-24-07 WITNESS: Kevin Holland
REQUESTER: IPUC RESPONDER: Ryan Finesilver
TYPE: Production Request DEPARTMENT: Energy Supply
REQUEST NO.: Staff—023C TELEPHONE: [phone]
REQUEST:
According to the Clearwater Agreement,net revenue from the sale of Clearwater generated RECs
will be split between the Company(10%)and Clearwater(90%). Please provide evidence showing
that the amounts of revenue reflected in Line "456380 ED ID — Sch 25P REC Revenue" in the
IPUC Deferral Analysis corresponds to 10% of the net revenue from the sale of Clearwater
generated RECs.
RESPONSE:
Please note this response contains TRADE SECRET, PROPRIETARY or CONFIDENTIAL
information and exempt from public view and is separately filed under IDAPA 31.01.01,Rule 067
and 233, and Section 9-340D, Idaho Code.
FERC Account 456380 ED.ID is recorded within Avista's accounting system with the accounting
name "Other Electric Rev-Clearwater RECS"which represents the 10% of the REC split.
To support this and provide evidence as requested, please see Staff_PR_023C Confidential
Attachment A for the June 2024 monthly workpaper, calculating the 10% REC value of
$95,186.04. This amount agrees to the corresponding value within the IPUC Deferral Analysis
(Schultz workpapers, tab named"Act-Auth-Proposed", cell N60).

RECEIVED
Monday,August 26,2024
IDAHO PUBLIC
AVISTA CORPORATION UTILITIES COMMISSION
RESPONSE TO REQUEST FOR INFORMATION
JURISDICTION: IDAHO DATE PREPARED: 08/23/2024
CASE NO: AVU-E-24-07 WITNESS: Kevin Holland
REQUESTER: IPUC RESPONDER: Ryan Finesilver
TYPE: Production Request DEPARTMENT: Energy Supply
REQUEST NO.: Staff—024C TELEPHONE: [phone]
REQUEST:
Please respond to the following regarding Line "456030 ED ID Sch 25 P Transmission" in the
IPUC Deferral Analysis:
a. Please explain what Line "456030 ED ID-Sch 25 P Transmission"represents;
b. Please explain how the values on the Line "456030 ED ID-Sch 25 P Transmission" are
determined and provide workpapers that calculate the values;
c. Please explain how the MWhs used in the calculation of actual purchase power expenses
are determined;
d. Please explain why the value remains at the same level ($13,750) from July 2023 through
February of 2024;
e. Please explain why the value starts changing from March of 2024 on; and
f. Please explain why the value varies from month-to-month after March of 2024.
RESPONSE:
Please note this response contains TRADE SECRET, PROPRIETARY or CONFIDENTIAL
information and exempt from public view and is separately filed under IDAPA 31.01.01,Rule 067
and 233, and Section 9-340D, Idaho Code.
a. This line represents the transmission purchased for the Morgan Stanley REC deal.
b. The transmission value assigned to 456030 ED.ID is calculated as 10 percent of the
transmission purchased by Avista to facilitate the deal with Morgan Stanley (bundled
energy and REC's generated by Clearwater Paper)that is Avista's share. Clearwater Paper
is responsible for 90 percent of the purchased transmission.
c. The MWh value is based on the actual metered energy used by Clearwater Paper. The costs
associated with Morgan Stanley are a flat monthly amount and the remainder is charged to
Clearwater Paper.
d. The value is based on the agreed upon reservation values in MWh. In 2024, Clearwater's
transmission reservations had more variability between service types (Monthly Firm,
Weekly Firm, Daily Firm)which is reflected in the resulting monthly expenses. Please see
Staff PR_024C Confidential Attachment A for calendar 2023 and Staff_PR_024C
Confidential Attachment B for the January through July 2024 (YTD) volumes and totals
associated with each transmission service.
e. See part d. above.
f. See part d. above.

RECEIVED
Monday,August 26,2024
IDAHO PUBLIC
AVISTA CORPORATION
UTILITIES COMMISSION
RESPONSE TO REQUEST FOR INFORMATION
JURISDICTION: IDAHO DATE PREPARED: 08/23/2024
CASE NO: AVU-E-24-07 WITNESS: Kevin Holland
REQUESTER: IPUC RESPONDER: Ryan Finesilver
TYPE: Production Request DEPARTMENT: Energy Supply
REQUEST NO.: Staff—027C TELEPHONE: [phone]
REQUEST:
Please provide the forced and unforced downtime that lasted over 24 hours for each of the
Company's generation plants during the deferral period and provide the causes of each downtime.
RESPONSE:
Please note this response contains TRADE SECRET, PROPRIETARY or CONFIDENTIAL
information and exempt from public view and is separately filed under IDAPA 31.01.01,Rule 067
and 233, and Section 9-340D, Idaho Code.
Please see the Company's response to Staff_PR_005C for the requested information pertaining to
forced outages. For planned and maintenance outages, Avista has provided two spreadsheets, one
for July 1, 2023 through December 31, 2023 (Staff_PR_027C Confidential Attachment A), and
one for January 1, 2024 through June 30, 2024 (Staff PR 027C Confidential Attachment B).
For Colstrip,there was one planned outage on Unit 3 in September of 2023 to replace a temporary
exciter system with a refurbished exciter. There were two outages on Unit 4. One was a decision
to repair a tube leak. The unit was shut down to affect the repair in advance of expected extreme
cold weather. The second outage was the planned overhaul. Please see Staff_PR_027C
Confidential Attachment C for Unit 3 and Staff PR 027C Confidential Attachment D for Unit 4.