20180105PAC to Staff Attachment UT_DPU Set 3 (1).pdf

1407 W.NorthTemple
ROCKY MOUNTAIN Salt Lake City,UT 84116
POWER
A DIVISION OFPACIFICORP
December 19,2017
Erika Tedder
Division of Public Utilities
160 E 300 S,4th Floor
Salt Lake City,UT 84114
gandgategggt@tangov
Addet:@u_tah_.gov (C)
RE:UT Docket No.17-035-23
DPU 3rd Set Data Request (1)
Please find enclosed Rocky Mountain Power's Response to DPU 3rd Set Data Request 3.1.
Provided on the enclosed Confidential CD is Confidential Attachment DPU 3.1.Confidential
information is provided subject to Public Service Commission of Utah (UPSC)Rules 746-1-602
and 603.
If you have any questions,please call me at [phone].
Sincerely,
Jana Saba
Manager,Regulation
Enclosures
C.c.Béla Vastag/OCS [e-mail](C)
Gary A.Dodge/UAE [e-mail] (C)
Kevin Higgins/[e-mail] (C)
Neal Townsend/UAE [e-mail](C)(W)
Sophie Hays/UCE [e-mail](C)
Kate Bowman/UCE [e-mail](C)(W)
Emma Rieves/UCE [e-mail](C)(W)
17-035-23 /Rocky Mountain Power
December 19,2017
DPU Data Request 3.1
DPU Data Request 3.1
This data request is a follow-up to the conference call with PacifiCorp representatives on
December 13,2017,which included Company representatives Jana Saba,Ron Scheirer,
and Randy Baker.
Please refer to the "systems benefit curves"tab that is included in the project analysis
Excel spreadsheets used in in the RFP under this docket (or from the
"WindRFPAssumptionsBook 2017-10-06"file).Please explain in detail the cause or
causes of the significant differences,which are particularlyprominent for the years 2020
to 2027,between the avoided costs shown under the "UT/ID"columns and the "WY"
columns.Please include in the explanation one or two concrete examples that
demonstrate the differences.
Response to DPU Data Request 3.1
Differences in the front 10 years between the Utah/Idaho (UT/ID)proxy and Wyoming
(WY)proxy studies are attributed to Wyoming'sadvantageous wind profile,which
includes incremental generationfor each megawatt (MW)of installed capacity,relative to
the wind profile in other locations.The UT/ID location proxy has an overall capacity
factor of 38 percent compared to a WY capacity factor of 41 percent.Please refer to the
chart below,which illustrates the average 24-hour profile for the WY location and the
UT/ID location,indicating a clear Wyoming advantage in peak hours 7 to 22.This
provides incremental net power costs (NPC)savings to those produced from resources in
other proxy locations,leading to a higher dollars per megawatt-hour ($/MWh)benefit for
the WY location.
Average Annual Hourly Proxy Wind Profile
Comparison
60%
50%
40%
30%
20%
2 10%
<0%
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24
Hour of Day
--UT/ID Proxy WY Proxy
17-035-23 /Rocky Mountain Power
December 19,2017
DPU Data Request 3.1
In years 2028 and beyond,there are additional drivers related to Dave Johnston coal
resource retirements.
Note:the proxy locational studies were developed only with regards to establishing bid
rankings for inclusion in the short list.The actual bid modeling evaluates all included
bids simultaneously,in the same model,and therefore under identical conditions.
Please refer to Confidential Attachment DPU 3.1,which provides the hourly data
underlyingthe chart.
Confidential information is provided subject to Public Service Commission of Utah Rule
746-1-602 and 746-1-603.