20180410PAC to Staff UT OCS Set 16 (1-11).pdf

1407 W.NorthTemple
ROCKY MOUNTAIN Salt Lake City,UT 84116
POWER
A DIVISION OF PAC1FICORP
March 28,2018
Béla Vastag
Office of Consumer Services
160 East 300 South
Salt Lake City,Utah 84111
bvastag@utaakgov (C)
RE:UT Docket No.17-035-40
OCS 16*Set Data Request (1-11)
Please find enclosed Rocky MountainPower's Response to OCS 16th Set Data Request 16.10.
If you have any questions,please call me at [phone].
Sincerely,
Jana Saba
Manager,Regulation
Enclosures
C.c.Erika Tedder/DPU dpudatarequest utah.gov [e-mail](C)
Dan Kohler/DPU [e-mail](C)
Dan Peaco/DPU [e-mail] (C)(W)
Aliea Afnan/DPU [e-mail] (W)
[e-mail] (W)
Philip Hayet/OCS [e-mail] (C)
Gary A.Dodge/UAE [e-mail] (C)
Phillip Russell/UAE [e-mail] (C)
Kevin Higgins/UAE [e-mail] (C)
Neal Townsend/UAE [e-mail](C)(W)
Kate Bowman/UCE [e-mail](C)
Emma Rieves/UCE [e-mail](C)(W)
Lisa Tormoen Hickey/[e-mail] (C)
Mitch Longson/Interwest mloneson mc2b.com (C)
Nancy Kelly/[e-mail](C)
Jennifer Gardner/WRA [e-mail](C)
Penny Anderson/WRA [e-mail] (W)
Peter J.Mattheis/Nucor [e-mail] (C)
Eric J.Lacey/Nucor [e-mail] (C)(W)
William J.Evans/UIEC [e-mail]
Vicki M.Baldwin/UIEC [e-mail](W)
Chad C.Baker/UIEC [e-mail] (W)
17-035-40 /Rocky Mountain Power
March 28,2018
OCS Data Request 16.10
OCS Data Request 16.10
Refer to the Company's response to DPU 14.10.
(a)Is it accurate to state that the 4 reasons provided in this response are reasons
PacifiCorp believes it is obligated to complete the D2 segment by 2024?If this
characterization is not completely accurate,please clarify.
(b)PacifiCorp states that it has to ensure its OATT network transmission customers can
deliver their designated resources to their designated network loads on a firm basis.
Why does the Company believe that it is required to meet this obligation by 2024?
Why not earlier/later?
(c)Isn't it true that right now there are times when designated network resources are
unable to deliver to network loads due to transmission limits?Can't the Company
continue to rely on RAS schemes even after 2024 without having to construct the D2
segment?Please explain,and if this is not a proper characterization of PacifiCorp's
position,please clarify.
(d)Is there anything specific that will occur by 2024 such as expected load growth or
anything else that has led PacifiCorp to assume it is required to complete the D2
upgrades by 2024?Why not earlier/later?Please discuss.
(e)Please explain in detail PacifiCorp's obligation through its OATT requirements that
leads to PacifiCorp's retail customers having to pay nearly $700 million to ensure that
PacifiCorp can accommodate generator requests to interconnect under PacifiCorp's
OATT.Essentially,this is what the Company is expecting by stating that it would
have to construct the D2 segment by 2024.
(f)Please explain why reasons 2,3,and 4 would obligate retail customers to pay for the
construction of the line
Response to OCS Data Request 16.10
(a)The characterization is not accurate.As discussed in more detail in the Company's
response to DPU Data Request 14.10,PacifiCorp's long-term transmission plan calls
for the construction of multiplesegments of Energy Gateway,includingthe Aeolus-
to-Bridger/AnticlineLine,by an estimated outer-range date of 2024.
(b)As discussed in more detail in the Company's response to DPU Data Request 14.10,
firm deliveryof designated network resources to designated network loads is one of
several factors that contribute to the estimated 2024 date in PacifiCorp's long-term
transmission plan.
17-035-40 /Rocky Mountain Power
March 28,2018
OCS Data Request 16.10
(c)A generationtripping remedial action scheme (RAS)does not create new
transmission capacity,but rather is a tool employed for system reliability under
outage scenarios,which can minimize the need to construct even more new
transmission.PacifiCorp will rely on the new Aeolus RAS beyond 2024 in order to
minimize even greater new transmission needs.The Company has also previously
taken steps to increase transmission capacity by upgrading the existing transmission
system or implementing alternative transmission technologies.Since 2013,the
Company has completed several important projects to enhance the transmission
system in southeast Wyoming,includingthe dynamic line rating of the Miners
(Standpipe)-Platte 230 kilovolts (kV)(2013);Southern Wyoming Voltage Control
Scheme,which coordinated wind generationreactive output to stabilize local area
voltages (2015);and construction of the Standpipe substation and (60 megavolt
ampere reactive (MVAr))synchronous condenser for voltage control (2016).These
projects allowed the Company to delay the Transmission Projects,but are not a long-
term substitute for the Transmission Projects.
(d)Please refer to the Company's response to subpart (a)above,as well as the
Company's response to DPU Data Request 14.10.
(e)Please refer to the Company's response to subpart (a)above,as well the Company's
response to DPU Data Request 14.10.
(f)While the reasons identified are all valid,at this point the principal need is driven by
deliverabilityof designated network resources.To the extent that other transmission
rights can be sold,it serves as an offset to retail customers.Also,please refer to the
Company's response to OCS Data Request 16.11.