20230522AVU to Staff 176 Revised.pdf

AVISTA CORPORATION
RESPONSE TO REQUEST FOR INFORMATION

JURISDICTION: IDAHO DATE PREPARED: 05/22/2023
CASE NO: AVU-E-23-01 / AVU-G-23-01 WITNESS: Clint Kalich
REQUESTER: IPUC RESPONDER: Lori Hermanson
TYPE: Production Request DEPARTMENT: Energy Resources
REQUEST NO.: Staff-176 Revised TELEPHONE: [phone]

REQUEST:
Please re-run the Aurora model using (1) the latest one-month natural gas forwards prices and
electric forwards prices provided in the previous request, and (2) by including Rattlesnake Flat
and Palouse Wind in the Aurora model for dispatch. Please update Confidential Exhibit No. 7
(based on the re-run) in electronic format with all formula enabled, with the following
additional information:
a. A breakdown of Columbia Basin Hydro ("CBH") costs by project;
b. A breakdown of CBH transmission costs by project; and
c. A breakdown of Chelan PUD costs between the existing contract and the newly
signed contract.

RESPONSE:
Please see Avista's response Staff_PR_176C, which 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 Staff_PR_176C Confidential Attachment A which includes the exhibit as filed adjusted
for updated latest one-month forwards through 4/20/2023 and the addition of Rattlesnake Flat and
Palouse wind projects.
a) Please see Staff_PR_176C Confidential Attachment A line items 7-10 in sheets ‘Schedule
2 RY1’ and ‘Schedule 2 RY2’ for the breakdown of CBH costs by projects. This had no
effect in RY1 and RY2 as compared with Staff_PR_175.
b) Please see ‘Columbia Basin Hydro Transmission’ sheet of the ‘565 Transmission Expense’
workpaper for the CBH transmission by project. This had no net effect to power supply
costs in the exhibit as these costs were already included.
c) Please see Staff_PR_176C Confidential Attachment A line items 3-4 in sheets ‘Schedule 2
RY1’ and ‘Schedule 2 RY2’ for the breakdown of the existing Chelan slice and the
2024-2033 Chelan slice. This had no net effect to power supply costs as it was just further
break out of the Chelan PUD line item.

As shown in Staff_PR_176 Attachment A, are comparisons with the components of Staff_PR_175
as compared with what was filed. As compared with Staff_PR_175, removing the Idaho portion of
the CCA adder from the Boulder Park units, results in $1.270 and $1.306 million additional CCA
costs in RY1 and RY2, respectively.

RECEIVED
2023 May 22, 4:39PM
IDAHO PUBLIC
UTILITIES COMMISSION