20210511Quarterly Report.pdf

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N!POIUER-
AnDICORP@mpany1 - ;i' l\ / f/'I;1,.-L --l l l*\J
:" i I D[, Q, l:.-.:.,iilllu'lt
JULIA A. HILTON
Deputy General Counsel
ih i [e-mail]
/ -Lr -)/
(l-
May 1 1,2021
Ms. Jan Noriyuki
Secretary
ldaho Public Utilities Commission
PO Box 83720
Boise, lD 83720-0074
Re Case No. IPC-E-16-19
Deferral and Recovery of Costs Associated with Participation in Energy lmbalance
Market - Califomia lndependent System Operator ('CAISO') Quarterly Energy
Imbalance Market ('ElM') Benefits Assessment Report
Dear Ms. Noriyuki:
Pursuant to Order No. 33706 issued in Case No. IPC-E-16-19, Idaho Power Company
("ldaho Powed'or "Company") hereby submits the quarterly CAISO Westem EIM Benefits Report
("Report") for the first quarter of 2021. The Report presents CAISO's quantification of benefits
associated with participation in the Western ElM. For the first quarter of 2021, CAISO estimated
Western EIM gross benefits of $12.54 million for ldaho Power.
The EIM has provided financial benefits to the Company, and ultimately its customers.
However, as discussed in ldaho Power's prior quarterly compliance filings as well as the
Company's May 24,2019, Report of EIM Benefits and Costs of Participation, CAISO's calculation
of benefits for ldaho Power is overstated due to several of the modeling assumptions used in its
benefit calculation. The Company developed a more precise methodology, that uses inputs
specific to ldaho Power, for determining actual EIM benefits, the details of which are discussed in
the Company's May 24,2019, Report of EIM Benefits and Costs of Participation.
lf you have any questions regarding this report, please contact Matt Larkin, Revenue
Requirement Senior Manager, at [phone] or [e-mail].
Sincerely,
Enclosure
Julia A. Hilton
e Colifornio ISO
WESTERN EIM BENEFITS REPORT
First Quarter 2021 I
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April 29,2021
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WESTERN EIM BENEFITS REPORT FIRST QUARTER 2021
CONTENTS
EXECUTIVE SUMMARY
BACKGROUND.........
WESTERN EIM EGONOMIC BENEFITS IN Ql 2021.........
CUMULATIVE ECONOMIC BENEFITS SINCE INCEPTION
INTER-REGIONAL TRANSFERS................
WHEEL THROUGH TRANSFERS.................
REDUCED RENEWABLE CURTAILMENT AND GHG REDUCTIONS
3
4
4
5
5
3
18
19FLEXIBLE RAMPING PROCUREMENT DIVERSITY SAVINGS.
...23
...24APPENDIX 1 : GLOSSARY OF ABBREV|AT!ONS........
MPP/MA&F Copyright 2021 California ISO Page2ot24
WESTERN EIM BENEFITS REPORT F!RST QUARTER 2021
EXECUTIVE SUMMARY
Gross benefits from EIM since November 2014
This report presents the benefits associated with
participation in the Western Energy lmbalance
Market (ElM).
Seottle
Ciry Lighr
Tocomo
Powu
NV PociftCorpEn gy
Arizm PuhlicS*vicc
Morket Opeolor
Colifornio ISO
EIM mlity, Aclire porliciponl
f Plonned EIM enky 2021
f Plonned EIM enhy 2022
! P onned EIM onry 2023
Public Service
Compony ofNew Mexico
Power
Portlond
Generol
Eleclric
BANC\
Turlak \lrrigotion\'
Diskicl
The measured benefits of participation in the
Western EIM include cost savings, increased
integration of renewable energy, and improved
operational efficiencies including the reduction of the
need for real-time flexible reserves.
This analysis demonstrates the benefit of economic
dispatch in the real time market across a larger EIM
footprint with more diverse resources and geography
Q'l 2021Gross Benefits by Participant
Q1 BENEFITS
ECONOMICAL
Gross benefits realized due to more
efficient inter-and intra-regional
dispatch in the Fifteen-Minute
Market (FMM) and Real-Time
Dispatch (RTD[
ENVIRONMENTAL
Metric tons of COz** avoided
curtailments
OPERATIONAL
Average reduction in flexibility
reserves across the footprint
Coliforniorso /t
los Anqelcs
Dept-oI
Wdter &
Power ,/
,rU*,( )tProiecl I' Tucson
Elctric
Power
L
El Poso
Elaclric
Arizona Public Service
BANC
California ISO
ldaho Power
NV Energy
PacifiCorp
Portland General Electric
Puget Sound Energy
Powerex
Seattle City Light
Salt River Project
Total
(millions $)
$15.01
$7.53
$8.91
$12.54
$14.14
$20.48
$8.80
$4.31
$1 .17
$2.60
$5.52
$101 .01
-ElM Quarterly Benefit Report Methodology:
irlt1,:,.'r,r",,', ;,fslr-ilrri ll (.r)ili'[Jr.\.[irr.rr!: L ll\,1 Li.,rr.lrll lt{t, , 1r,]L,r:y.l di
.-The GHG emission reduction reported is associated with the avoided curtailment
only. The current market process and counterfactual methodology cannot differentiate
the GHG emissions resulting from serving ISO load via the EIM versus dispatch that
would have occurred external to the ISO without the ElM. For more details, see
lliilr..t.,..l.!,,':.:trl!-D,-,i,-rt ltL,:(lrr:irtil,,r:,(-, -Liit: , .Ii,r,.r.rr!,R!i,r-,i1
i r' (ilrilrll r'/\:i.t,tiClLltSt l.tls, 1., ii
MPP/MA&F Copyright 2021 California ISO Page 3 of 24
WESTERN EIM BENEFITS REPORT FIRST QUARTER 2021
' BACKGROUND
The Western EIM began financially binding operation on November 1,2014 by optimizing
resources across the ISO and PacifiCorp Balancing Authority Areas (BAAs). NV Energy began
participating in December 2015, Arizona Public Service and Puget Sound Energy began
participating in October 2016, and Portland General Electric began participating in October
2017. ldaho Power and Powerex began participating in April 2018, and the Balancing Authority
of Northern California (BANC)I began participating in April 2019. Seattle City Light and Salt
River Project began participating in April 2020.
Most recently, three new balancing authorities began participating in the Western ElM, with the
Turlock lrrigation District in March 20212 and the Los Angeles Department of Water and Power
and Public Service Company of New Mexico in April 2021. The second phase of BANC also
began participating in March 2021 as well.
The Western EIM footprint now includes portions of Arizona, California, ldaho, Nevada, New
Mexico, Oregon, Utah, Washington, Wyoming, and extends to the border with Canada.
I WESTERN EIM ECONOMIC BENEFITS IN Q1 2021
Table 1 shows the estimated EIM gross benefits by each region per month3. The monthly
savings presented show $15.77 million for January, $61.70 million for February, and $23.54
million for March with a total estimated benefit of $101 .01 million for this quarter.
The increased benefits observed on February 2021was largely driven by the extreme gas
prices in mid-February that resulted in high electric energy prices.
Region January February March Total
APS
BANC
c,so
tPco
NVE
PAC
PGE
' The benefits for BANC reflects only the Sacramento Municipal Utility District through March 24 since
Modesto lrrigation District, the City of Redding, the City of Roseville, and the Western Area Power
Administration - Sierra Nevada Region became part of the overall BANC EIM on March 25. Benefits for
BANC for March 25 through March 31 will be included in Q2-2021 benefits.
2 Benefits for TID for March 25 through March 31 will be incorporated in Q2-2021 benefits report along
with the other new EIM Entities.
3 The EIM benefits reported here are calculated based on available data. lntervals without complete data
are excluded in the calculation. The intervals excluded due to unavailable data are normally within a few
percent of the total intervals.
$1.73 $11.16 $z.tz $15.01
$1.e6 $3.+t $2.16 $7.53
$0.79 $4.80 $3.32 $8.91
$1.e3 $8.12 $2.4e $12.54
$1.36 $10.99 $1.7e $14.14
$2.53 $14.41 $3.54 $20.48
$1.64 $3.62 $3.54 $8.80
MPP/MA&F Copyright 2021 California ISO PaEe 4 ol 24
WESTERN EIM BENEFITS REPORT FIRST QUARTER 2021
$1.62 $1.32 $4.31$1.37
$0.20 $0.62 $0.35 $1 .17
$0.80 $1.08 $o.tz $2.60
$1.87 $2.19 $5.52$1.46
$101.01$15.77 $61.70 $23.54
Region January February March Total
PSE
PWRX
SCL
SRP
Total
TABLE 1: Q12021benefits in millions USD
I CUMULATTVE ECONOMIC BENEFITS SINCE INCEPTION
Since the start of the EIM in November 2014, the cumulative economic benefits of the market
have totaled $1.28 billion. The quarterly benefits have grown over time as a result of the
participation of new BAAs, which results in benefits for both the individual BAA but also
compounds the benefits to adjacent BAAs through additional transfers. The ISO began
publishing quarterly EIM benefit reports in April 2015.4
Graph 1 illustrates the gross economic benefits of the EIM by quarter for each participating
BAA.
$1 40
$120
$1 00
$80
$60
$40
$20
$0 Q4 01 Q2 03 04 Q1 Q2 03 04 0'1 02 03 Q4 01 02 03 04 01 02 03 04 01
2014 2015 2016 2017 2018 n19
03 04 01
2020 ?!21
r-PSEI
EPWRX
-Cumulative
Benelits
ctC
.9=6
5.Z
oEoaoo
3E
EI(J
$1.2
$1.0
$0.8
$0.6
$0.4
$0.2
$0.0
o2
oce.
I
oEo6oooo
ECISOt_AZPS
@BANC
EPACrPGEISCL
ENEVPrIPCOESRP
GRAPH 1: Cumulative economic benefits for each quarter by BAA
I INTER.REGIONAL TRANSFERS
A significant contributor to EIM benefits is transfers across balancing areas, providing access to
lower cost supply, while factoring in the cost of compliance with greenhouse gas (GHG)
a Prior reports are available at httos://www.westerneim.com/Paoes/AbouUQuarterlvBenefits.aspx
MPP/MA&F Copyright 2021 California ISO Page 5 of 24
WESTERN EIM BENEFITS REPORT FIRST QUARTER 2021
emissions regulations when energy is transferred into the lSO. As such, the transfer volumes
are a good indicator of a portion of the benefits attributed to the ElM. Transfers can take place in
both the 1S-Minute Market and Real-Time Dispatch (RTD).
Generally, transfer limits are based on transmission and interchange rights that participating
balancing authority areas make available to the ElM, with the exception of the PacifiCorp West
(PACW) -lSO transfer limit and the Portland General Electric (PGE)-lSO transfer limit in RTD.
These RTD transfer capacities between PACWPGE and the lSO are determined based on the
allocated dynamic transfer capability driven by system operating conditions. This report does
not quantify a BAA's opportunity cost that the utility considered when using its transfer rights for
the ElM.
Table 2 provides the 1S-minute and S-minute EIM transfer volumes with base schedule
transfers excluded. The EIM entities submit inter-BAA transfers in their base schedules. The
benefits quantified in this report are only attributable to the transfers that occurred through the
ElM. The benefits do not include any transfers attributed to transfers submitted in the base
schedules that are scheduled prior to the start of the ElM.
The transfer from BAA_x to BAA1I and the transfer from BAA3 to BAA_x are separately
reported. For example, if there is a 100 Megawatt-Hour (MWh) transfer during a 5-minute
interval, in addition to a base transfer from ISO to NVE, it will be reported as 100 MWh
from_BAA lSO to_BAA NEVP, and 0 MWh from_BAA NEVP to_BAA ISO in the opposite
direction. The 1S-minute transfer volume is the result of optimization in the 1S-minute market
using all bids and base schedules submitted into the ElM. The S-minute transfer volume is the
result of optimization using all bids and base schedules submitted into ElM, based on unit
commitments determined in the 1S-minute market optimization. The maximum transfer
capacities between EIM entities are shown in Graph 2 below.
Month From BAA To BAA
15min EIM transfer
(15m - base)
Smin EIM transfer
(5m - base)
AZPS CISO 123,307 91,442
AZPS NEVP 4,263 7,005
AZPS PACE 42,398 53,563
AZPS SRP 34,890 33,216
BANC CISO 2,852 1 921
clso AZPS 55,596 59,668
ctso BANC 119,M3 129,444
ctso NEVP 98,976 107,887
clso PACW 2,888 17,963
crso PGE 5,573 12,875
January
MPP/MA&F copyright 2021 california lSo Page 6 of 24
WESTERN EIM BENEFITS REPORT FIRST QUARTER 2021
Month From BAA To BAA
15min EIM transfer
(15m - base)
5min EIM transfer
(5m - base)
CISO PWRX 3,584 8,892
crso SRP 41,890 45,350
IPCO NEVP 88,016 62,003
tPco PACE 36,933 41,660
IPCO PACW 19,214 17,252
tPco PSEI 0 0
tPco SCL 2,33 1 2,635
NEVP AZPS 4,426 4,336
NEVP crso 178,543 1 13,343
NEVP tPco 29,694 33,329
NEVP PACE 56,540 65,786
PACE AZPS 94,245 81,719
PACE IPCO 13,585 14,684
PACE NEVP 59,325 25,473
PACE PACW 5,329 5,129
PACE SRP 0 0
PACW ctso 64,774 64,174
PACW tPco 72,571 56,883
PACW PGE 19,346 15,434
PACW PSEI 12,406 13,029
PACW SCL 1,264 978
PGE CISO 19,675 3
PGE PACW 60,823 75,932
PGE PSEI 8,101 9,050
PGE SCL 2,500 2,215
PSEI !PCO 0 0
PSEI PACW 20,398 23,438
January
MPP/MA&F Copyright 2021 California ISO PageT ol24
WESTERN ElM BENEFITS REPORT FIRST QUARTER 2021
Month From BAA To BAA
15min EIM transfer
(15m - base)
Smin EIM transfer
(5m - base)
January
PSEI PGE 33,678 43,859
PSE!PWRX 42,632 M,477
PSEI SCL 19,683 19,780
PWRX ctso 12,885 2
PWRX PSEI 12,824 16,396
SCL tPco 16,567 15,924
SCL PACW 10,235 12,100
SCL PGE 3,131 3,814
SCL PSE!14,477 1 4t754
SRP AZPS 10,637 17,262
SRP crso 84,613 71,852
SRP PACE 0 0
AZPS crso 81,909 57,656
AZPS NEVP 3,770 5,098
AZPS PACE 37,495 40,657
AZPS SRP 25,238
BANC CISO
AZPS
9,261 6,524
crso 75,348 82,605
crso BANC 1 10,899 124,011
crso NEVP 152,899 173,994
CISO PACW 5,631 28t793
crso PGE 11,743 25,631
crso PWRX 4,861 11,562
crso SRP 50,244 54,720
lPco NEVP 63,707 49,025
tPco PACE 29,343 28,603
IPCO PACW 36,588 47,000
23,872
February
MPP/MA&F copyright 2021 california lso Page 8 of 24
WESTERN EIM BENEFITS REPORT FIRST QUARTER 2021
Month From BAA To BAA
f Smin EIM transfer
(15m - base)
5min EIM transfer
(5m - base)
tPco PSEI 0 0
!PCO SCL 4 796 6,057
NEVP AZPS 6,270 4,840
NEVP ctso 152,169 97,741
NEVP rPco 65,572 73,717
NEVP PACE 68,599 80,796
PACE AZPS 83,639 71,813
PACE tPco 44,639 47,745
PACE NEVP 70,667 45,781
PACE PACW 13,291 15,175
PACE SRP 0 0
PACW clso 28,947 50,228
PACW rPco 35,301 24,711
PACW PGE 36,628 37,463
PACW PSEI 25,586 30,321
PACW SCL 2,150 2,079
PGE crso 21,851 54
PGE PACW 38,512 52,492
PGE PSEI I 6 452 20,807
PGE SCL 3,557 3,737
PSEI IPCO 0 0
PSEI PACW 12,772 13,531
PSEI PGE 23,610 25,400
PSEI PWRX 29,280 30,595
PSEI SCL 24,885 25,776
PVVRX crso 9,526 25
PWRX PSEI 28,255 30,363
February
MPP/MA&F Copyright 2021 California ISO Page 9 of 24
WESTERN EIM BENEFITS REPORT FIRST QUARTER 2021
Month From BAA To BAA
1Smin EIM transfer
(15m - base)
Smin EIM transfer
(5m - base)
February
SCL IPCO 10,925 9,107
SCL PACW 5,942 7,022
SCL PGE 2,204 2,533
SCL PSEI 9,282 11,579
SRP AZPS 6,649 8,091
SRP ctso 51,362 45,876
SRP PACE 0 0
AZPS CISO 110,552 87,281
AZPS NEVP 2,783 5,862
AZPS PACE 44,300 55,231
AZPS SRP 19,605 17,228
BANC CISO 1,614 1,899
CISO AZPS 71,716 81 ,618
ctso BANC 102,863 108,930
crso NEVP 124,067 130,005
crso PACW 4,349 34,860
crso PGE 14,628 29,398
CISO PWRX 7,210 13,196
CISO SRP 55,021 60,404
IPCO NEVP 46,498 34,112
lPco PACE 11,741 16,794
rPco PACW 21,652 24,637
lPco PSE!0 0
tPco SCL 5,829 6,649
NEVP AZPS 4,927 4,038
NEVP crso 150,523 104,732
NEVP IPCO 43,683 50,962
March
MPP/MA&F copyright 2021 california lso Page 10 of 24
WESTERN EIM BENEFITS REPORT FIRST QUARTER 2021
Month From BAA To BAA
lSmin EIM transfer
(15m - base)
Smin EIM transfer
(5m - base)
NEVP PACE 60,510 66,649
PACE AZPS 82,949 66,239
PACE rPco 47,046 52,702
PACE NEVP 64,953 46,310
PACE PACW 22,062 27,985
PACE SRP 0 0
PACW ctso 34,999 43,842
PACW IPCO 49,229 40,992
PACW PGE 30,789 31,285
PACW PSEI 30,326 36,356
PACW SCL 2,272 2,370
PGE ctso 18,323 6
PGE PACW 45,534 57,130
PGE PSEI 17,484 24,725
PGE SCL 4,262 4,506
PSEI rPco 10,415 8,610
PSEI PACW 29,647 37,194
PSEI PGE 10,311 11,685
PSEI PWRX 27,339 28,700
PSEI SCL 23,707 26,513
PWRX CISO 12,557 1
PWRX PSEI 41,837 44,567
SCL lPco 10,430 9,349
SCL PACW 3,832 4,644
SCL PGE 2,012 2,278
SCL PSEI 15,919 17,968
SRP AZPS 8,206 12,479
March
MPP/MA&F Copyright 2021 California ISO Page LI of 24
WESTERN EIM BENEFITS REPORT FIRST QUARTER 2021
Month From BAA To BAA
lSmin EIM transfer
(15m - base)
Smin EIM transfer
(5m - base)
March SRP crso 84,532 74,529
SRP PACE 0 0
TABLE 2: Energy transfers (MWh) in the FMM and RTD markets for Ql 2021
tifrrdtih'c+.+mVl
Pdr 24 lwsdbadJ t00
Po/rt2/lrrclrlbwrd/35-90
Eldorodo 797
Pdr 35lrcdbod,5m
Pdr 35 laor, b *sdl 538
Go&r$olqrt t30
PACWbTE 320
Pdr 66 b 627
fD 296
66 b gil
&
Pdr 17 O-,aOOI I
PSE bPACW 300
Fdov.r&, N.Gh 3,151
t
349
rA€od 230 fAPS <-> EO,l 236
l,tsd 230 fEO b f.Jl€ 3,443
l,{md 230 f,i.r}f b rSO, 3,176
Bhl
rcOb PACW [Polh 751 l,sff)
PCO b PACI 1,550
tr/EbFCO 262
Powc?ex <-> PSE t50
Powrcx <-> ISO r50
BAI{C <-> ISO 2,mo-4,m0
NDbEO 1,Io0
IID to BAI{C 650
h 0 eEa r&5 tr AC[Jr(rn Br :dr ad bogaje o 16r U grCfCpzXOgCf ondEt /5 qay.
' r,!i, ! il n GdbrFdyd[E5{O/rch.f mdAl rJ rilB s.llrydud B X ud mr o lur 17.ldEiftaaocd
cril-dry7$l
GRAPH 2: Estimated maximum transfer capacity (ElM entities operating in Ql 2021)
Ilalt
Ma6
ICdlEnb 60
Ip*ri.c-p
lNvE-'sr
!*i-o Arbaic S.ilic
!lo.f-a G.rcna ecci"
Ifuf, Sornd Erqgy
Iu"u fmu Canrpory
!P*.!arxc
S.d. Ct It hr
S Scf tin, Ropa
I rlDrw
I ArHtc Servtc€ Co.ipony ol Xsr rr,taxfo
I lrrbcf lnqonon Drnict
I t'loilhUhrhro trtsg't t*ryzczl1
lruro wnrnnl
I fulor ElEdrk FoflEr,.rrt ?o?4
I hcuno Pursr loFyao?4
E Bdlna{lb Por€r Admtntsffii..r lary 2O2q
!Icd Eecgy-Cdcrodrc'crrynz4
I El Poro Bedrt( tary 2C23t
-modllec[on -
hdrccltoml
MPP/MA&F Copyright 2021 California ISO PaEe 12 of 24
WESTERN EIM BENEFITS REPORT FIRST QUARTER 2021
I WHEEL THROUGH TRANSFERS
As the footprint of the Western EIM grows, wheel-through transfers may become more common
Currently, an EIM entity facilitating a wheel through receives no direct financial benefit for
facilitating the wheel; only the sink and source directly benefit. As part of the Western EIM
Consolidated lnitiatives stakeholder process, the lSO committed to monitoring the wheel
through volumes to assess whether, after the addition of new EIM entities, there is a potential
future need to pursue a market solution to address the equitable sharing of wheeling benefits.
The ISO will continue to track the volume of wheelthrough transfers in the EIM market in the
quarterly reports. ln order to derive the wheel-through transfers for each EIM BAA, the ISO uses
the following calculation for every real-time interval dispatch:
Total import summation of transfers above base transfers coming into the EIM BAA
under analysis
Total export: summation of all transfers above base transfers going out of the EIM
BAA under analysis
Net import: the maximum of zero or the difference between total imports and total
exports
Net export'. the maximum of zero or the difference between total exports and total
imports
Wheelthrough: the minimum of the EIM transfers into (total import) or EIM transfer
out (total export) of a BAA for a given interval
Allwheelthrough transfers are summed over both the month and the quarter. This volume
reflects the totalwheel-through transfers for each EIM BAA, regardless of the potential paths
used to wheel through. The net imports and exports estimated in this section reflect the overall
volume of net imports and exports; in contrast, the imports and exports provided in Table 2
reflect the gross transfers between two EIM BAAs.
The metric is measured as energy in MWh for each month and the conesponding calendar
quarter, as shown in Tables 3 through 6 and Graphs 3 through 6.
a
a
a
MPP/MA&F copyright 2021 california lso Page 13 of 24
WESTERN EIM BENEFITS REPORT F!RsT QUARTER 2021
BAA Net Exprt Net lmport Wheell Through
AZPS
BANC
crso
tPco
NEVP
FACE
PACW
PGE
PSE'
PINF}(
scL
SRP
TABLE 3: Ectlmated wheel.through transferu in Qt 202{
e
EE>rBoEuJ
2,0(x),0m
1,800.000
1,600,cp0
1.4(x).0(x)
1,?00,000
1,000,m
8(D,0m
600,0m
400,0m
200,ocx)
0 II Itl
AZPS BANC Cl6O IPC? NEVP PACE PACW pcE
rNe( Erport rtlst Inp6t
lllr..
PSEI PVIRX $CL
rt,th€cl Thrcugh
SRP
GRAPH 3: Estlmdsd wheehthrough tranrfer ln Ql 2021
10,355 361,995
147,4&249,709 199,501
442,4ffi 391,878 58,424
161,908 153,004 89,097
83,126 129,381 8,290
229,829 234,97?321
MPP/MA&F CopyrEht 2021 celfomla ISO Pa$ t4d2'[
WESTERN EIM BENEFITS REPORT FIRST OUARTER2O2I
1,921 12g,UA
57,113 54,217 66,802
5,20011 149,956 11,512
49,912 8,792 37,397
15,83€52,890 597
88,893 78,757 221
BAA Net E:port Net lmport Wheel-Through
AZPS
BANC
ctso
tPco
NEVP
PACE
PACW
POE
PSE'
PWRX
sct
SRP
TABLE 4: Estlmated wheel-through trancferr in January 2021
7U),(x)0
000,0(x)
5(x),Om
G3
=
400,0@
EDocul
300,000
200,000
100,000 ll ll I lrlrrl
AZPS BANC CISO IPCO NE\P PACE PACW PGE PSEI PW,RX SCL
rNet Export rNet lrport l!,thoel Through
GRAPH 4: Estlmated wheel-through transferc ln January202l
SRP
MPP/MA&F
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Copyrtgl"rt 2021 Caltfornla ISO Page t5o{24
WESTERN EIM BENEFITS REPORT FIRST QUARTER 2021
6,524 124,138
63,761 88,418 66,974
154,294 123,655 26,498
47,369 29,76661,405
26,889 38,693 3,508
53,952 78,623 15
RNA Net Export Net lmport Wheeh Through
AZPS
BANC
c/so
tPco
NEVP
PACE
PACW
PGE
PSE/
PWRX
SCL
SRP
TABLE 5: Estimated wheel-through transfers in February 2021
s
B
=o
oc
LU
700,000
600,000
500,000
400,000
300,000
200,000
100,000
0 I
SRP
I
SCL
II
AZPS BANC CISO IPCO NEVP
. Net Export
PACE PACW PGE PSEI P\ARX
rNet lmport r\Mreel Through
GRAPH 5: Estimated wheel-through transfers in February 2021
MPP/MA&F copyright 2021 california lso Page 16 of 24
WESTERN EIM BENEFITS REPORT FIRST QUARTER 2021
1,910 109,016
26,573 107,074 55,725
173,002 118,266 20,414
64,527 52,817 21,934
40,400 37,797 4,184
86,984 77,593 85
BAA Net Export Net lmport WheelThrough
AZPS
BANC
c,so
tPco
NEVP
PACE
PACW
PGE
PSE'
PWRX
scL
SRP
TABLE 6: Estimated whee!-through transfers in March 2021
700,000
600,000
400,000
300,000
200,000
100,000 rl llr
500,000
3
=
o,ocuJ
I
SRP
I
scL
I
AZPS BANC CISO
I Net Export
IPCO NEVP PACE PACW
rNet lmport
PGE PSEI P\A'IX
lWleel Through
GRAPH 6: Estimated wheel-through transfers in March 2021
MPP/MA&F
0
Copyright 2021 Glifornia ISO Page 17 of 24
WESTERN EIM BENEFITS REPORT FIRST QUARTER 2021
I REDUCED RENEWABLE CURTAILMENT AND GHG REDUCTIONS
The Western EIM benefit calculation includes the economic benefits that can be attributed to
avoided renewable curtailment within the ISO footprint. lf not for energy transfers facilitated by
the ElM, some renewable generation located within the ISO would have been curtailed via
either economic or exceptional dispatch. The total avoided renewable curtailment volume in
MWh for Q1 2021 was calculated to be 19,089 MWh (January) + 28,216 MWh (February) +
28,842 MWh (March) = 76,107 MWh total.
There are environmental benefits of avoided renewable curtailment as well. Under the
assumption that avoided renewable curtailments displace production from other resources at a
default emission rate of 0.428 metric tons COz/MWh, avoided curtailments displaced an
estimated 32,591 metric tons of COz for Q1 2021. Avoided renewable curtailments also may
have contributed to an increased volume of renewable credits that would otherwise have been
unavailable. This report does not quantify the additional value in dollars associated with this
benefit. Total estimated reductions in the curtailment of renewable energy in the ISO footprint,
along with the associated reductions in COz, are shown in Table 7.
Year Quarter MWh Eq. Tons COz
2015
2016
2017
2018
132,9372
1 8,860 3,792
2 3,629 1,553
3 828 354
4 17,765 7,521
1 112,948 48,342
2 158,806 67,969
3 33,094 14,164
4 23,390 10,011
1 52,651 22,535
2 67,055 28,700
3 23,331 9,986
4 18,060 7,730
1 65,860 28,188
2 129,128 55,267
3 19,032 8,146
4 23,425 10,026
1 52,254 22,365
MPP/MA&F
2019
Copyright 2021 California ISO
56,897
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WESTERN EIM BENEFITS REPORT FIRST QUARTER 2021
3 33,843 14,485
4 35,254 15,089
1 86,740 37,125
2 147,514 63,136
3 37,548 16,071
4 39,956 1 7 1 01
1 76,147 32,591
1,400,055 599,144
Year Quarter MWh Eq. Tons COz
2019
2020
2021
Total
TABLE 7: Total reduction in curtailment of renewable energy and associated reductions in COz
I FLEXIBLE RAMPING PROCUREMENT DIVERSITY SAVINGS
The Western EIM facilitates procurement of flexible ramping capacity in the FMM to address
variability that may occur in the RTD. Because variability across different BAAs may happen in
opposite directions, the flexible ramping requirement for the entire EIM footprint can be less
than the sum of individual BAA's requirements. This difference is known as flexible ramping
procurement diversity savings.
Starting in 2016, the ISO replaced the flexible ramping constraint with flexible ramping products
that provide both upward and downward ramping. The minimum and maximum flexible ramping
requirements for each BAA and for each direction are listed in Table 8.
Month BAA Direction Minimum
requirement
Maximum
requirement
AZPS up 0 286
BANC up 0 59
c/so up 0 2392
lPco up 0 165
NEVP up 0 261
PACE up 0 328
PACW up 0 181
PGE up 0 253
PSE/up 0 170
PWRX up 0 291
scr up 0 45
MPP/MA&F
January
Copyright 2021 California ISO Page 19 of 24
WESTERN EIM BENEFITS REPORT FIRST QUARTER 2021
Month BAA Direction Minimum
requirement
Maximum
requirement
January
SRP up 0 180
ALL EIM up 0 2,666
AZPS down 0 230
BANC down 0 70
crso down 0 1,36 1
tPco down 0 224
NEVP down 0 339
PACE down 0 391
183PACWdown0
PGE down 0 234
PSE'down 0 158
PWRX down 0 237
sct down 0 49
SRP down 0 164
ALL EIM down 0 1,807
AZPS up 23 292
BANC up 4 59
c/so up 269 2,119
tPco up 24 165
NEVP up 16 275
PACE up 96 328
PACW up 54 1 81
PGE up M 310
PSE/up 40 162
PWRX up 78 291
SCL up 4 47
SRP up 27 180
ALL EIM up 410 2,748
AZPS down 14 229
MPP/MA&F
February
Copyright 2021 California ISO Page 20 of 24
WESTERN EIM BENEFITS REPORT FIRST QUARTER 2021
Month BAA Direction Minimum
requirement
Maximum
requirement
February
BANC down 70
c/so down 179 1,36 1
tPco down 46 224
NEVP down 25 270
PACE down 95 363
PACW down 42 183
PGE down 42 234
PSE/down 36 158
PWRX down 77 237
scr down I 49
SRP down 26 164
ALL EIM down 217 1,807
AZPS up 28 292
BANC up 5 59
crso up 342 2,119
tPco up 36 212
NEVP up 19 275
PACE up 100 328
PACW up 66 181
PGE up 69 310
PSE/up 32 167
PWRX up 77 282
scr up 4 52
SRP up 31 1 51
ALL EIM up 421 2,748
AZPS down 28 292
BANC down 4 70
C/SO down 203 1,36 I
tPco down 66 224
March
MPP/MA&F Copyright 2021 California ISO Page 2L of 24
WESTERN EIM BENEFITS REPORT FIRST QUARTER 2021
BAA Direction Minimum
requirement
Maximum
requirement
NEVP down 23 274
PACE down 98 407
PACW down 42 183
down 234PGE53
1 5 1PSE/down 33
PWRX down 77 268
sct down 4 49
SRP down 26 1 6 1
ALL EIM down 251 1,807
Table 8: Flexible ramping requirements
The flexible ramping procurement diversity savings for all the intervals averaged over the month
are shown in Table 9. The percentage savings is the average MW savings divided by the sum of
the four individual BAA requirements.
January February March
Direction
Average MW saving
Sum of BAA requirements
Percentage savrngs 50o/o
Table 9: Flexible ramping procurement diversity savings in Ql 2021
Flexible ramping capacity may be used in RTD to handle uncertainties in the future interval. The
RTD flexible ramping capacity is prorated to each BAA. Flexible ramping surplus MW is defined
as the awarded flexible ramping capacity in RTD minus its share, and the flexible ramping
surplus cost is defined as the flexible ramping surplus MW multiplied by the flexible ramping
EIM-wide marginal price. A positive flexible ramping surplus MW is the capacity that a BAA
provided to help other BAAs, and a negative flexible ramping surplus MW is the capacity that a
BAA received from other BAAs.
The EIM dispatch cost for a BAA with positive flexible ramping surplus MW is increased
because some capacities are used to help other BAAs. The flexible ramping surplus cost is
subtracted from the BAA's EIM dispatch cost to reflect the true dispatch cost of a BAA. Please
see the Benefit Report Methodology for more details.
Up Down Up Down Up Down
983 918 998 970 1,022 993
1,956 1,804 2,011 1,943 2,188 1,978
5oo/o 510/50%47o/o 5Qo/o
MPP/MA&F Copyright 2021 California ISO PageZ? ot 24
WESTERN EIM BENEFITS REPORT FIRST QUARTER 2021
I CONCLUSION
Using state-ofthe-art technology to find and deliver low-cost energy to meet real-time demand,
the Western EIM demonstrates that utilities can realize financial and operational benefits
through increased coordination and optimization. !n addition to these benefits, the Western EIM
provides significant environmental benefits through the reduction of renewable curtailments
during periods of oversupply.
Sharing resources across a larger geographic area reduces greenhouse gas emissions by using
renewable generation that othenuise would have been turned off. The quantified environmental
benefits from avoided curtailments of renewable generation trom 2015 to-date reached 599,144
metric tons of COz, roughly the equivalent of avoiding the emissions from 125,967 passenger
cars driven for one year.
MPP/MA&F Copyright 2021 California ISO Pagel3 ol 24
WESTERN EIM BENEFITS REPORT FIRST QUARTER 2021
APPENDIX 1: GLOSSARY OF ABBREVIATIONS
Abbreviation
APS Arizona Public Service
Balanci AreaBAA
BANC
ctso lso
E!M
FMM
GHG
tPco
MW
MWh
NVE
PAC
PACE
PACW
PGE
PSE
PWRX
RTD
SCL
SRP
TID
Balanci of Northern California
NV
California ISO
Imbalance Market
Fifteen Minute Market
Greenhouse Gas
ldaho Power
our
East
West
Portland General Electric
Sound
Powerex
RealTime
Seattle
Salt River
Turlock lrrigation District
MPP/MA&F Copyright 2021 California ISO Page24ol24