20170925Utah_DPU Set 4 (1-7).pdf

1407 W.North Temple
ROCKY MOUNTAIN Salt Lake City,UT 84116
POWER
A DIVISION OFI¼QRCORP
August 18,2017
Erika Tedder
Division of Public Utilities
160 E 300 S,4th Floor
Salt Lake City,UT 84114
[e-mail]
[e-mail](C)
RE:UT Docket No.17-035-39
DPU 4th Set Data Request (1-7)
Please find enclosed Rocky Mountain Power's Responses to DPU 4th Set Data Requests 4.1-
4 7 .Provided on the enclosed Confidential CD is Confidential Attachment DPU 4.5 and
Confidential Responses to DPU 4.1,4.3,and 4.4.Confidential information is provided subject to
Public Service Commission of Utah (UPSC)Rules 746-1-602 and 746-1-603.
If you have any questions,please call Tarie Hansen at [phone].
Sincerely,
Bob Lively
Manager,Regulation
Enclosures
C.c.:Dan Kohler/DPU dkoehler daymarkea.corn (C)
Dan Peac/DPU (C)(W)
Aliea Afnan/DPU (W)
Béla Vastag/OCS [e-mail] (C)
Philip Hayet/OCS (C)
Gary A.Dodge/UAE [e-mail]_(C)
Kevin Higgins/UAEkhiggins enereystrat.com (C)
Neal Townsend/UAE n (C)(W)
17-035-39 /Rocky Mountain Power
August 18,2017
DPU Data Request 4.1
DPU Data Request 4.1
Hemstreet Testimony.In reference to lines 63-64,what is the estimated useful life of the
energy collection system for each wind facility?What is the maximum energy capacity
for each wind facility collection system?
Confidential Response to DPU Data Request 4.1
The Company estimates that the useful life for the energy collection systems at each
facility is up to 50 years.The maximum energy capacity for each wind facility collection
system is generally limited by the generator step-up transformer (GSU).The Company
anticipates that current GSU capacity ratings can,if necessary,be increased with
modificationsto the transformer cooling systems.The confidential table below lists the
ratings of the existing GSUs at each wind project.These ratings are at a temperature rise
of 65 degrees Celsius above ambient temperature (40 degrees Celsius)with the second
stage cooling fans in service.
.GSU RatingFacility(megavolt ampere (MVA))
Dunlap I
Glenrock I &Glenrock IH
Glenrock HI &RollingHills
Goodnoe Hills
High Plains/McFadden Ridge
Leaning Juniper
Marengo I
Marengo H
Seven Mile Hill I and H
Confidential information is providedsubject to Public Service Commission of Utah
(UPSC)Rule 746-1-602 and 746-1-603.
17-035-39 /Rocky Mountain Power
August 18,2017
DPU Data Request 4.2
DPU Data Request 4.2
Hemstreet Testimony.In reference to lines 94-96,with the premise that the new
interconnect agreements are approved for the higher capacity and the Company relies on
this higher capacity,in the event that the wind is curtailed for whatever reason or is not
producing as designed,what impact will this have on FOTs and other generation resource
fuel costs,etc.?Please explain in detail and provide analysis with intact formulae.
Response to DPU Data Request 4.2
The Company performed an "Increased Wind Repower Capacity Sensitivity"to assess
the impacts of modified interconnection agreements that accommodate the additional
capacity from repowered wind facilities.The portfolio results for this sensitivity,
including front office transactions (FOT),was providedwith the confidential work papers
supporting the Direct Testimony of Company witness,Rick T.Link;specifically:
the folder entitled "SO Model Summary Reports",the file entitled "SO Portfolio
SENS-RPC-EGI-MM 1706042133".
Additional information including net power costs (NPC)was also providedwith Mr.
Link's confidential work papers;specifically:
the folder entitle "Exhibits Figures Tables",the file entitled "Repower Results
Direct Testimony".Note:refer to the SO Sensitivity worksheet,"Increased Wind
Repower Capacity Sensitivity ($Million)"on row 77.
Outside of this sensitivity,the existing interconnection agreement limits are assumed for
the repowered projects.
17-035-39 /Rocky Mountain Power
August 18,2017
DPU Data Request 4.3
DPU Data Request 4.3
Hemstreet Testimony.In reference to lines 142-145,is book value only used to determine
the FMV of the assets or were other valuation methods used to determine the 80/20
requirements?If so please provide the full valuationreports,analysis and conclusions for
a sample of valuationreports.
Confidential Response to DPU Data Request 4.3
Please refer to the Company's response to DPU Data Request 1.13.
Confidential information is provided subject to Public Service Commission of Utah
(UPSC)Rules 746-1-602 and 746-1-603.
17-035-39 /Rocky Mountain Power
August 18,2017
DPU Data Request 4.4
DPU Data Request 4.4
Hemstreet Testimony.In reference to lines 350-355,what is the estimated price to
refurbish the used gear boxes that will be used as replacements on other WTGs that will
not be repowered?
Confidential Response to DPU Data Request 4.4
Confidential information is provided subject to Public Service Commission of Utah
(UPSC)Rule 746-1-602 and 746-1-603.
17-035-39 /Rocky Mountain Power
August 18,2017
DPU Data Request 4.5
DPU Data Request 4.5
Hemstreet Testimony.In reference to lines 362-364,please provide the blade
replacement expenses for the remainder of the fleet other than those provided for
Goodnoe Hills.
Response to DPU Data Request 4.5
Please refer to Confidential Attachment DPU 4.5.
Confidential information is provided subject to Public Service Commission of Utah
(UPSC)Rule 746-1-602 and 746-1-603.
17-035-39 /Rocky Mountain Power
August 18,2017
DPU Data Request 4.6
DPU Data Request 4.6
Hemstreet Testimony.In reference to Exhibit JJH-2,please explain Column I,Current
Long-Term Generation,and how it is calculated.Please providethe calculation in Excel
format with intact formulae.
Response to DPU Data Request 4.6
The Company assumes that the reference to "Exhibit JJH-2"is intended to be Exhibit
RMP (TJH-2).Based on the foregoingassumption,the Company responds as follows:
Please refer to the Company's response to OCS Data Request 1.25 subpart (a).
17-035-39 /Rocky Mountain Power
August 18,2017
DPU Data Request 4.7
DPU Data Request 4.7
O &M.Please provide any analysis,with intact formulae where applicable,pertaining to
additional long-term expenses relating to the longer blades used for the repowering as a
result of:
(a)Stress cracks,
(b)Vibration,
(c)Routine maintenance including inspections,
(d)Hub/Pitch routine maintenance including inspections,
(e)Low /High speed shaft and brake.
Response to DPU Data Request 4.7
The Company objects to this request as requiring a special study or information not
maintained or developed in the ordinary course of business.Without waiving this
objection,the Company responds as follows.
The Company has not conducted the requested analysis.The Company does not expect
additional,incremental long-term expensesrelating to the longer blades as compared to
the existing blades.The Company does not expect routine equipment inspections and
maintenance of the new blades and associated systems to be more expensive than that
required for the existing equipment.