20180329PAC to Staff UT DPU Set 25 (1-7).pdf

1407 W.North Temple
ROCKY MOUNTAIN Salt Lake City,UT 84116
POWER
A DIVISION OF PAC1FICORP
March 19,2018
Erika Tedder
Division of Public Utilities
160 E 300 S,4th Floor
Salt Lake City,UT 84114
dad_ataleÆRSt RhoY
[e-mail](C)
RE:UT Docket No.17-035-40
DPU 25th Set Data Request (1-7)
Please find enclosed Rocky Mountain Power's Responses to DPU 25th Set Data Requests 25.1-
25.7.Provided electronicallyare Attachments DPU 25.2 and 25.5-1.Provided on the enclosed
Confidential CD are Confidential Responses DPU 25.1,25.2,25.4,and 25.5 and Confidential
Attachment DPU 25.5-2.Confidential information is provided subject to Public Service
Commission of Utah (UPSC)Rule 746-1-602 and 746-1-603.
If you have any questions,please call me at [phone].
Sincerely,
Jana Saba
Manager,Regulation
Enclosures
C.c.:Dan Kohler/DPU d_k_o_elgegagm com (C)
Aliea Afnan/DPU aggan@daym a coln (W)
jbowgr@d_aygiagea._c_om(W)
Dan Peaco/DPU _dpea_co@Àay_ma_rk_emsn (C)(W)
Kevin Higgins/UAEkhiggins@en gygraggyn (C)
Neal Townsend/UAE ntownse.pd_@energystatern (C)(W)
Gary A.Dodge/UAE gdgdla_w.com (C)
Phiuip RusselLUAE prugglaw coyrr(€)
Philip Hayet/OCS [e-mail](C)
Béla Vastag/OCS [e-mail] (C)
Sophie Hays/UCE Mtahelea_nenergiarg (C)
Kate Bowman/UCE ka_t_e@ughgleanenergyarg (C)(W)
Emma Rieves/UCE enuna@u_tgleleanenergyarg(C)(W)
Lisa Tormoen Hickey/Interwestjis_ah_jg_ey@ne_wlawgroup.com(C)
Mitch Longson/Interwest in_longson@_mc2bµm (C)
Nancy Kelly/WRAnk ogg (C)
Jennifer Gardner/WRA (C)
Penny Anderson/WRA peany.an terigg esources.gg;(W)
Peter J.Mattheis/Nucor pgg (C)
Eric J.Lacey/Nucor ej]ggsngblgoggom (C)(W)
William J.Evans/UIEC [e-mail]
Vicki M.Baldwin/UIEC 3¾paiski (W)
Chad C.Baker/UIEC Maarsonsbehle.com (W)
17-035-40 /Rocky Mountain Power
March 19,2018
DPU Data Request 25.1
DPU Data Request 25.1
CONFIDENTIAL REQUEST-Refer to the Company's Response to DPU 21 1,
Appendix C -Power Flow Diagrams,Pages 2,4,6,8:
(a)Please confirm that the generatingunit associated with bus 'UNIT_LO'(bus number:
69534)refers to Q542,indicated on Figure 2 of DPU 21.1,Aeolus West Transmission
Path Transfer Capability Assessment (February 2018),Page 12.If not confirmed,
please identify this project.
(b)
(c)Please identify all network upgrades associated with Q542.
(d)Please identify those network upgrades included in response to part (c)above that
were included in the February 2018 updated transfer capability assessment.
(e)Refer to the PacifiCorp Interconnection Queue
(htt_p_;/ww_wgois.o_a);iaom/PB¾_(PIP_W_docs/p_acjtico_rplgj_aghtrn)
Q542-A,Q542-B and Q542-C have their 'Request Status'as 'Suspended'.Please
explain why 'Suspended'queue projects were included in the February 2018 updated
transfer capability assessment.
Response to DPU Data Request 25.1
(a)Confirmed;the Q0542 project is represented as bus 'UNIT_LO'(bus number:69534)
in the power flow diagrams.
(b)
(c)
17-035-40 /Rocky Mountain Power
March 19,2018
DPU Data Request 25.1
(d)The February 2018 updated transfer capability assessment included the same network
improvements identified in subpart (c)above.
(e)Section 5.16 of PacifiCorp's large generator interconnection agreement (LGIA),
which mirrors the Federal Energy Regulatory Commission's pro forma LGIA,
provides the interconnection customer the right to request that the construction and
installation of facilities required under the LGIA be suspend for up to three years.The
interconnection customer can request that construction and installation of the LGIA-
required facilities recommence at any time during that three year period.PacifiCorp
transmission considers suspended projects to be active queue projects until the
suspended project is officially withdrawn from the queue.
Confidential information is provided subject to Public Service Commission of Utah (UPSC)
Rules 746-1-602 and 746-1-603.
17-035-40 /Rocky Mountain Power
March 19,2018
DPU Data Request 25.2
DPU Data Request 25.2
CONFIDENTIAL REQUEST-Comparing the slider diagrams between DPU 21.1,
Appendix C -Power Flow Diagrams,and OCS 8.1,Appendix C -Power Flow Diagrams
CONF:
(a)
(b)Please compare the significance of electrical locations between
with respect to the Platte-
Latham 230 kV line for an outage of the Anticline-Aeolus 500 kV.Please provide the
associated outage transfer distribution factor (OTDF)of
on the Platte-Latham line for
the same outage.
(c)
(d)Please provide a similar list of all Wyoming generation(existing and new)along with
their maximum rated output capability ('PMax'in MW)utilized in the February 2018
updated transfer capability assessment.
(e)
(f)Please confirm if additional sensitivity analysis will be performed by retaining
in-service and
determining the transfer capability for Aeolus-West path.If so,when will this
analysis be complete and provided in this docket?
Response to DPU Data Request 25.2
(a)
(b)
17-035-40 /Rocky Mountain Power
March 19,2018
DPU Data Request 25.2
F¡gure 2
Ex¡sting/Proposed Wyoming Generation Resources,and Transrnission Constraints
O Wyomont Montana
PacifiCorp Franni n uŒe
Aeolus West/TOT 4B SheridaWyomingTransmission(MDU)
Constraints -ariand
North Wyoming Lookout
Buffa
Draw
271 8 MW NT
Hughes I
Grass TOT 48 Barbe
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<230 kV Existing Kaycee no sagd
230 kV Existin9 1
-345 kV Existing Therm olis
ekla
adwater Midwes Glenrock/countyune
Rolling Hill telopeMine
Buite 18.5 MW eaYellow ke Q712 C Springs i
inedale AEOLUS WEST 507
in indWyopo16.5 MW g TOW
Naughton Load Paradise Casper 811 MW 200.2 MW
Atlantie ---Amasa East Wyoming
ChimneyButte BigPiney
F
City
Central
pence RootCreek80MW
C ppe
?Wyoming
Bairoi
Dificulty Q7071 8 8 tsI &H
ToTreasureto?
Kernmerer o
lrona Mustan
EOLUS sta o Flats
aughton Br ager )WEST Platte 7 Mie Hill1719MWePaidesoAntcl.*.-1185MW
L
cree M ime O 5 MW
To Ben Lomoed High Plains-99 MWMcFaddenRidge28.5 MWAEOLUSWEST/TOT 48
Limit:Simultaneous--ruw--------------
Color
Nomogram
(d)Please refer to Attachment DPU 25 2
(f)
17-035-40 /Rocky Mountain Power
March 19,2018
DPU Data Request 25.2
Confidential information is provided subject to Public Service Commission of Utah
(UPSC)Rules 746-1-602 and 746-1-603.
17-035-40 /Rocky Mountain Power
March 19,2018
DPU Data Request 25.3
DPU Data Request 25.3
Refer to DPU 21.1,Aeolus West Transmission Path Transfer Capability Assessment
(February 2018),Pages 1 and 10:
(a)Please provide the standard criteria utilized by PacifiCorp to determine which new
generationresources are included in the path transfer capability assessment.For
example,queue Request Status,In-Service Date,interconnection location,etc.
Provide any documentation supporting this response.
(b)Please confirm that all new 'active'resources (Request Status as 'In-Progress')from
the Company's Generation Interconnection Queue with a commercial operation date
on or before the study period are included in a path transfer capability assessment.
(c)Please explain if the February 2018 updated transfer capability assessment conforms
to the criteria identified in response to part (a)and/or includes all new 'active'
resources (Request Status as 'In-Progress')from the Company's Generation
Interconnection Queue with a commercial operation date on or before November
2020.
Response to DPU Data Request 25.3
(a)The October 2017 path transfer capability assessment included a number of different
projects from PacifiCorp transmission's interconnection queue in various locations
near the planned Aeolus substation,where the new 500 kilovolt (kV)line originates,
as a proxy for then-potential new wind projects.Once the RFP short-list was
determined,the path transfer capability assessment was updated to reflect those
selected generators,and it was also determinedthat an additional qualifyingfacility
project interconnecting in northern Wyoming could be accommodated.
(b)No,not all "in-progress"projects in the Company's interconnection queue are
included in the path transfer capability assessment,as PacifiCorp's interconnection
queue has over 25,000 megawatts (MW)of projects with "in progress"status.The
February 2018 path transfer capability assessment only modeled in-service projects,
RFP short-list projects,and one qualify facility project.
(c)Please refer to the Company's responses to subparts (a)and (b)above.
17-035-40 /Rocky Mountain Power
March 19,2018
DPU Data Request 25.4
DPU Data Request 25.4
CONFIDENTIAL REQUEST-Refer to DPU 21.1,Aeolus West Transmission Path
Transfer Capability Assessment (February 2018),Page 15,stating 'The Montana
resources,up to 591 MW,were re-dispatched with WAPA...':Please describe why
Montana resources were redispatched by up to 591 MW in the February 2018 updated
transfer capability assessment
Response to DPU Data Request 25.4
During the February 2018 Aeolus West vs TOT 4B path transfer capability assessment,
transfers with Montana were adjusted to identify the maximum transfer levels between
the two paths based on the location of resources.This change in resource location
between the two studies drove the change in re-dispatch levels.Once the D.2 Project
(Bridger/Anticline-Aeolus)is placed in-service and Grid Operations is operating the
Aeolus West path,simultaneous path flows will be maintained below the established
nomogram maximum transfer levels.
Confidential information is provided subject to Public Service Commission of Utah
(UPSC)Rules 746-1-602 and 746-1-603.
17-035-40 /Rocky Mountain Power
March 19,2018
DPU Data Request 25.5
DPU Data Request 25.5
CONFIDENTIAL REQUEST-Refer to DPU 21.1,Aeolus West Transmission Path
Transfer Capability Assessment (February 2018),Page 12-13 and DPU 21.1,Appendix C
-Power Flow Diagrams,Page 2 (Nomogram Point 1):
(a)Please provide the actual dispatch for each generatingunit used to determine the
maximum transfer capability of 1792 MW over the Aeolus West path while
maintaining 99 MW over TOT 4B path.
(b)Please provide the PSS/E .raw file (or PSLF powerflowfile)that reflects the dispatch
provided in response to part (a).
(c)
(d)Please provide the PSS/E .raw file (or PSLF powerflowfile)that reflects the dispatch
provided in response to part (c).
Response to DPU Data Request 25.5
(a)Please refer to Attachment DPU 25.5_l.
(b)Please refer to Confidential Attachment DPU 25.5_2.
(c)Please refer to subpart (a)above.
(d)Please refer to subpart (b)above.
17-035-40 /Rocky Mountain Power
March 19,2018
DPU Data Request 25.6
DPU Data Request 25.6
Refer to DPU 21.1,Aeolus West Transmission Path Transfer Capability Assessment
(February 2018),Table 4 (p.11),labeled "PacifiCorp 2017R Shortlist Generation
Resources".
(a)The table includes Q0712 as 520 MW,but the proposed Cedar Springs project is only
400 MW.Has the Company conducted transfer capability analysis using the 400
MW capacity proposed in the Application?If so,please provide the analysis.If not,
why not?
(b)The table includes Q715 and Q810,which total 221 MW,but the proposed Uinta
project is only 161 MW.Has the Company conducted transfer capability analysis
using the 161 MW capacity proposed in the Application?If so,please provide the
analysis.If not,why not?
Response to DPU Data Request 25.6
(a)PacifiCorp transmission's transmission path transfer capability assessment reflected a
520 megawatt (MW)interconnection because that was the interconnection capability
requested by the interconnection customer under PacifiCorp's Open Access
Transmission Tariff interconnection procedures.System operating limit studies to be
performed in 2019 will include any revisions required or requested for the new wind
projects at that time.The existing study demonstrates that the larger 520 MW project
can be successfully interconnectedwith the network improvements identified,sp
identification of additional facility requirements is not anticipated with a smaller
project.It is acknowledged that the ultimate transfer capability of the Aeolus West
path may change slightly.
(b)PacifiCorp transmission's transmission path transfer capability assessment reflected a
total 221 MW interconnection because that was the total interconnection capability
requested by the interconnection customer under PacifiCorp's Open Access
Transmission Tariff interconnection procedures.System improvements identified to
interconnect the total 221 MW will be sufficient to accommodate a smaller project.
As this part of the system is not subject to a Western Electricity Coordinating Council
(WECC)rated path,no path ratings are required.
17-035-40 /Rocky Mountain Power
March 19,2018
DPU Data Request 25.7
DPU Data Request 25.7
Refer to DPU 21.1,Aeolus West Transmission Path Transfer Capability Assessment
(February 2018),page 13,Table 1.To achieve the Aeolus West transfer of 1,792 MW,
the TOT 4B interface must be limited to 99 MW.Is this constraint reflected in the PaR
and SO modeling topology?If so,please provide references to the location of the input
file modifications reflecting this change.
Response to DPU Data Request 25.7
Yes.The "Aeolus West Transmission Path Transfer Capability Assessment"(February
2018)studies transmission impacts at a significantlyhigher degree of granularitythan can
be directly modeled in a system-level integrated resource planning model.However,the
outcomes of the assessment inform the total transfer limit between nodes used in both the
System Optimizer model (SO model)and Planning and Risk (PaR)model.
Please refer to the Company's response to OCS Data Request 10.13,and specifically
Confidential Attachment OCS 10.13,illustratinga change of transfer limits between
impacted nodes.Page 3 of the attachment shows that the Wyoming NE to Aeolus transfer
limit is 844 megawatts (MW)without the Aeolus-to-Bridger/AnticlineLine,and that the
Aeolus to Bridger transfer limit is zero MW.On page 4,these transfer limits increase to
1,630 MW and 750 MW respectively,equatingto an increase of transfer capability of
786 MW and 750 MW respectively.While the "Aeolus West Transmission Path Transfer
Capability Assessment"(February 2018)studies indicates an effective increase of 915
MW in transfer capability across Wyoming,the SO model and the PaR model use a more
conservativevalue.The 786 MW increase between the Wyoming NE and Aeolus nodes
is inclusive of the alleviated transmission de-rate described in the direct testimony of
Company witness,Rick T.Link,page 24,lines 552 through 565.
These input changes,by year and month,can be viewed using Microsoft Excel and were
provided with the confidential work papers supporting Mr.Link's supplemental direct
testimony,specifically the "TieCF"file provided for each case in the "SO Input-
Output"folder.For example,for the case "Rl7-FSLW-MM",this file will be labeled
"TieCF-Rl7-FSLW-MM0000.csv".In this file,the transmission capacity between any
two nodes (in columns 3 and 4)is given by year (column 1)and month (column2).The
capacity limits for peak hours are displayed in column 9,and the capacity limits for peak
hours are displayed in column 10.