20201204PAC to Staff 18-19.pdf

1407 W North Temple, Suite 330 Salt Lake City, Utah 84116
December 4, 2020 Jan Noriyuki Idaho Public Utilities Commission 472 W. Washington
Boise, ID 83702-5918 [e-mail] (C)
RE: ID PAC-E-20-13 IPUC 3rd Set Data Request (18-19) Please find enclosed Rocky Mountain Power’s Responses to IPUC Data Requests 18-19. Provided via encryption is Confidential Attachment IPUC 18. Confidential information is provided subject to protection under IDAPA 31.01.01.067 and 31.01.01.233, the Idaho Public
Utilities Commission’s Rules of Procedure No. 67 – Information Exempt from Public Review, and further subject to any subsequent Non-Disclosure Agreement (NDA) executed in this proceeding. If you have any questions, please feel free to call me at [phone]. Sincerely,
____/s/____
J. Ted Weston Manager, Regulation Enclosures C.c.: Tom Arkoosh /Idahydro/REC [e-mail] Amber Dresslar/Idahydro/REC [e-mail] Erin Cecil/ Idahydro/REC [e-mail] John Lowe/REC [e-mail] Irion Sanger/REC [e-mail]

RECEIVED
2020December 4, PM 3:48
IDAHO PUBLIC
UTILITIES COMMISSION
PAC-E-20-13 / Rocky Mountain Power December 4, 2020 IPUC Data Request 18
IPUC Data Request 18 Please provide updated system capacity Load and Resource Balances for both summer peak and winter peak that meet the following criteria:

(a) The most recent load forecast completed in June 2020 and mentioned in Response to Staff’s Production Request No. 10 that reflects the COVID-19 pandemic.

(b) Updated planning reserves based on the load forecast discussed above. (c) The latest contract information of both PURPA contracts and non-PURPA contracts as of filing the response to this request. In addition, please explain the difference between the latest contract information and the contract
information used in the Application.
(d) Cumulative coal plant derate adjustments that would be applied in each year, independently, so that the “Sufficiency/Deficiency w/o Early Retirements” are
accurate for each year, instead of only providing cumulative derates for 2029.
Response to IPUC Data Request 18
Please refer to Confidential Attachment IPUC 18.
(a) The change in the June 2020 load forecast, relative to the 2019 Integrated Resource Plan (IRP) forecast, is calculated within Confidential Attachment
IPUC 18, tab “Load Forecast Update”. (b) The change in the load forecast, grossed up for the impact of the 13 percent planning reserve margin (PRM), is shown in row 64 of tabs “Tbl 5.12” (for
summer) and “Tbl 5.13” (for winter). This amount is subtracted from the “SAR Sufficiency/Deficiency” calculation on row 69 of both tabs. (c) Row 68 of tab “Tbl 5.12” (for summer) and tab “Tbl 5.13” (for winter) has been updated to include signed contracts through November 30, 2020. Since
the Application in this proceeding was prepared, the Company has entered
into two non-qualifying facility (QF) Public Utility Regulatory Policies Act (PURPA) power purchase agreements (PPA) for solar resources, totaling 200 megawatts (MW) nameplate capacity, and has extended two existing QF PURPA PPAs for Idaho small hydro resources totaling 0.8 MW. The Company has also entered or extended four non-firm (NF) QF PURPA contracts with 64 MW of nameplate capacity, which do not impact the capacity load and resource balance. (d) Please refer to row 80 of “Tbl 5.12” (for summer) and “Tbl 5.13” (for winter).

PAC-E-20-13 / Rocky Mountain Power December 4, 2020 IPUC Data Request 18
Confidential information is provided subject to protection under IDAPA 31.01.01.067 and 31.01.01.233, the Idaho Public Utilities Commission’s Rules of Procedure No. 67 – Information Exempt from Public Review, and further subject to any subsequent Non-Disclosure Agreement (NDA) executed in this proceeding.

Recordholder: Dan MacNeil
Sponsor: To Be Determined

PAC-E-20-13 / Rocky Mountain Power December 4, 2020 IPUC Data Request 19
IPUC Data Request 19 Please explain how “uncommitted FOTs to meet remaining need” values are determined and define and explain the significance of “uncommitted FOTs to
meet remaining need”.
Response to IPUC Data Request 19
Referencing PacifiCorp’s 2019 Integrated Resource Plan (IRP), specifically
Volume I, Chapter 5 (Load and Resource Balance), Table 5.12 (Summer Peak – System Capacity Loads and Resources without Resource Additions) and Table 5.13 (Winter Peak System Capacity Loads and Resources without Resource Additions). Toward the bottom of Table 5.12 and Table 5.13, the “System Position” for each year is the remaining need.

“Uncommitted FOT’s to meet remaining need” indicates how many future market purchases would be necessary in order to cover the system position. In years where the system is surplus, no future market purchases would be necessary, and
a zero would be shown for uncommitted FOTs. The uncommitted FOTs will be
equal and offsetting to the system position, so long as the deficit is less than the assumed maximum available FOTs. The year in which the assumed maximum available FOTs are no longer sufficient to cover the system deficit marks the beginning of the deficiency period, as it is assumed to be the year in which additional resources would be needed to meet capacity requirements.

Note: generation resources within the Company’s balancing authority areas (BAA) incur a contingency reserve requirement of 3 percent under North American Electric Reliability Corporation (NERC) reliability standard BAL-002-
WECC-2. Because they are assumed to be firm purchases, the Company is not
required to hold additional contingency reserves for FOTs. To account for this distinction, in the 2019 IRP the maximum capacity from FOTs as shown in Table 5.12 and Table 5.13 is 103 percent of the assumed FOT capacity limit. Therefore, for the 1,425 megawatt (MW) FOT limit in the 2019 IRP, the maximum capacity value is 3 percent higher, at 1,468 MW.

PacifiCorp’s 2019 IRP is publicly available and can be accessed by utilizing the following website link:
https://www.pacificorp.com/energy/integrated-resource-plan.html

Recordholder: Dan MacNeil
Sponsor: To Be Determined