1. DS-PDWG Approval Items
Jamie Austin
PDWG Chair
Western Electricity Coordinating Council

2. Western Electricity Coordinating Council
Overview
Approval Items
Phase 1 Proposed Edits
Phase 2 Supplemental Resources
Western Electricity Coordinating Council

3. Western Electricity Coordinating Council
Phase 1 Proposed Edits
Proposed edits were uncovered during the validation of the 2028 ADS PCM V1.0
Phase 1 edits, pertain to fixes of corrupt data in V1.0
Topology and generator definitions come from the power flow (PF).
Other data needed that allows the hourly dispatch for 8760 hours, referenced as “other data” in ADS documentation, has been and will continue to be in public domain.
This “proxy” data is developed by PDWG and replaces unattainable, sensitive and confidential data.
Examples of such data includes, but are not limited to, heat rate curves, plant ramp rates (up and down), startup costs, fuel prices, hourly shapes for loads and other energy data
The ADS continues to reflect the most recent version of the planning regions’ regional plans, and resources definition do mirror the definition of resources in the WECC 2028 HS1 power flow.
Western Electricity Coordinating Council

4. Western Electricity Coordinating Council
Approval Items
Phase 1
Proposed Edits
Western Electricity Coordinating Council

5. Transmission Ownership Fixes
Pancake wheeling occurring on PDCI branch terminating in SCE/CAISO.
Was fixed in ADS Seed case, but misrepresented in 2028 ADS PCM V1.0.
All buses between Cap. Jack 500kV and Tracy 500kV buses should be assigned to BANC
Incorrectly mapped to CIPV and PACW in V1.0.
Ownership of Malin to Grizzly should be revisited.
Western Electricity Coordinating Council

6. Transmission Ownership Fixes
Motion
“It is moved that DS approves WECC staff change ownership in the PCM of
bus Sylmar to SCE or BPA
assign all buses between Cap. Jack 500kV and Tracy 500kV to BANC (currently, mapped to CIPV and PACW in ADS PCM V1.0 incorrectly)”
Western Electricity Coordinating Council

7. Western Electricity Coordinating Council
NW Tier 1 Energy
The 2026CC target for Tier 1 energy into CA was 10,077.9 GWh while V1.0 allows an increase in Tier 1 energy of 26%.
Motion
“It is moved that DS approves WECC staff to change BPA area coefficient in nomogram to so that the modeled Tier 1 energy matches target in the PCM.”
Western Electricity Coordinating Council

8. Mismatch Wind/Solar Shapes
Shapes used for dispatch is different than commitment shape
99 units use a commitment shape based on 2009 while dispatch shape is based on 2005
27 units use commitment shape but no shape for dispatch
26 generating units totaling 1,376 MW
1 load units totaling MW
Motion
“It is moved that DS approves WECC staff alignment of appropriate dispatch shapes in the PCM consistent with 2009 shapes for all mismatched commit and dispatch as approved by PDWG.”
Western Electricity Coordinating Council

9. Western Electricity Coordinating Council
Beacon Solar Area
While checking, found a number of PV units modeled as thermal:
Western Electricity Coordinating Council

10. Beacon Solar Area Motion
“Motion” “It is moved that DS approves making appropriate modeling changes in the PCM to Beacon Solar Area to correct for appropriate technology.”
Western Electricity Coordinating Council

11. Interface Definitions
Proposed Interface corrections involving 13 interfaces, where 9 are BPA defined Flowgates (zCG interfaces)
9 had missing branches and/or needed to be delete
4 changed branch direction
The included spreadsheet includes documents all changes “Interface_Correction_from_CG_0627b.xlsx”
Western Electricity Coordinating Council

12. Interface Definitions
Motion
“It is moved that DS approves updating the definition of interfaces in the PCM as described in a spreadsheet submitted by ColumbiaGrid.
P03East Side NW-BC
P05 West of Cascades-South
P08 Montana to Northwest
P73 North of John Day
z CG Net COB (NW AC Intertie) & OP
z CG COI Plus PDCI
z CG Paul-Allston & OP
z CG P04 West of Cascades-North & OP
z CG P73 North of John Day & OP”
Western Electricity Coordinating Council

13. Antelope Nuclear Operation
UAMPS’ Antelope Nuclear plant constitutes 12 modular 50 MW units currently modeled as a single unit in V1.0.
Modeling results in consistent hourly dispatch at zero.
UAMPS takes pride on planning a flexible resource.
Plant maintenance and forced outages do not take down the entire plant, the modeling should be unit level, not consolidated into one.
Western Electricity Coordinating Council

14. Antelope Nuclear Operation Motion
“It is moved that DS approves updating Antelope Nuclear in the PCM to:
Must run
Model as twelve units in PCM with generation aggregated to one unit in PF
Outage duration: assume two events per year: 135 hours. Old value of 1 hour results in 298 outage events
With 50% dispatch range (HP1:= 50% & HP2:= 100%)
Fixed maintenance of 10 days every two years. This results in one unit being down for maintenance every other month.
Ramp rate 2 hours. Pmin to max (25%)”
Western Electricity Coordinating Council

15. Hydro Modeling Data Issue
A review of Hydro plants in the 2028 ADS PCM dataset revealed several projects had low modeling values – modify monthly coefficients to original values; just update of monthly variables, no change to PLF.
Western Electricity Coordinating Council

16. Hydro Modeling Data Issue
Motion “It is moved that DS approves implementing edits in the PCM submitted by Kevin Harris that updates monthly coefficients consistent with original values.”
Western Electricity Coordinating Council

17. Negative Pricing Impacts on Hydro outside of CA Motion
Negative pricing (-$25) applied to California wind and solar causes hydro outside of California to cycle for California Solar.
Significant additions of utility scale solar and BTM PV changed the net load shape.
Some areas have net daily minimum load occurring mid-day (load – solar).
Hydro generation is responding to the price signals and shifting its operation peak to load - solar
Western Electricity Coordinating Council

18. Negative Pricing Impacts on Hydro outside of CA
Motion
“It is moved that DS approves implementing the following changes in the PCM:
Change default setting to NO-Spill on non-California hydro plants.
Add negative $50 dollars (-$50) to hydro dispatch cost on hydro outside of California.
Set Hydro dispatch from load only to load minus wind minus solar with wind at 0% and solar at 75% by region.”
Western Electricity Coordinating Council

19. Hyatt & Thermalito Hydro Units
Edward Hyatt and Thermalito have Pumped Storage (PS) operation capable units. Historic review of public data and preliminary DWR response indicates these units will operate as Hydro units only, not PS.
Remove three pumped storage units at Hyatt
EdwardCHyatt2, EdwardCHyatt4, and EdwardCHyatt6
Change Thermalito_2, Thermalito_3, Thermalito_4 from PS to Hydro with Load Following flag checked
Western Electricity Coordinating Council

20. Hyatt & Thermalito Hydro Units Motion
“It is moved that DS approves modifying the pump storage modeling in the PCM at Hyatt and Thermalito as recommended.”
Western Electricity Coordinating Council

21. Western Electricity Coordinating Council
Other Hydro Updates
ADS seed case was based on the 2026 CC v1.3
Hydro assumption were incorporated in 2026 CC v2.0. Correct other Hydro modeling assumptions.
Correct modeling of Rock Island Hydro
Correct modeling of monthly variable
Change modeling of hourly shape to proportional load following to reflect changes made in 2026 CC v2.0
Western Electricity Coordinating Council

22. Western Electricity Coordinating Council
Other Hydro Updates
Motion
“It is moved that DS approves modifying Hydro modeling assumptions in the PCM as recommended.”
Western Electricity Coordinating Council

23. Klamath Falls Area Transmission
Remove Capt. Jack–Klamath Falls 500 kV, and keep Capt. Jack – Snow Goose–Klamath Falls 500 kV
Remove Malin–Klamath Falls 230 kV, and keep Malin–Snow Goose–Klamath Falls 230 kV
Meridian–Sam’s Valley–Dixonville 500 kV line impedances are wrong
Buckley–Slatt series capacitor is missing
Western Electricity Coordinating Council

24. Klamath Falls Area Transmission Motion
“It is moved that DS approves implementing the “epc” file that corrects Klamath Falls Area Transmission in the PCM, as it was submitted to WECC.”
Western Electricity Coordinating Council

25. Proposed Thermal Changes
Scattergood CC (1x1 CC F 300 MW) modeled as two separate units w/7.64 HR t.
Haynes CC (2x1 CC F 590 MW) is not operational
Grapeland Peaker and CTRPKGEN were originally parked
CarlsbandEC1-GT6 was modeled as thermal but should be battery
Western Electricity Coordinating Council

26. Proposed Thermal Changes
Motion
“It is moved that DS approves correcting the modeling of the plants in the PCM as follows with additional confirmation from the data owner:
Scattergood: Convert the modeling to one CC F unit
Haynes CC: Adjust retirement date from 6/1/2013 to 12/31/2050 Two Peaker units that were originally parked should be modeled as units in service
Grapeland Peaker at 29305
CTRPKGEN_29308 at 29308
Remove the previously modeled BC_25187_1C and BS_25188_1E units
Carlsband “EC1, GT6” (one single unit) on bus should be modeled as 100 MW battery instead of Gas turbine.”
Western Electricity Coordinating Council

27. Units Disconnected in PF – NTTG Edits
21 non-retired units in FP are disconnected (bus not energized)
10 Existing Wind Projects (880 MWs)
7 CTs (3-12, 3-42 & MWs)
2 Geothermal Units (18 MWs)
2 CCs (conceptual 1080 MWs)
Western Electricity Coordinating Council

28. Units Disconnected in PF – NTTG Edits Motion
“It is moved that DS approves correcting the modeling changes in the PCM proposed by NTTG in the detailed file listing generators requiring to be connected was made available by Ron Schellberg.”
Western Electricity Coordinating Council

29. Western Electricity Coordinating Council
Adjusting Coal Price
ADS PCM coal price is mainly based on CEC’s work using EIA public data.
Many coal units have plant-specific prices
Some units still use generic coal price
Use of annual capacity factor (CF) for coal is declining, due to increased penetration of renewable resources.
NTTG has identified a number of its coal units that are dispatching fictitiously at an alarmingly low CF in the 2028 ADS PCM V1.0, when compared to EIA 860 historic value.
Western Electricity Coordinating Council

30. Western Electricity Coordinating Council
Adjusting Coal Price
PDWG formed a focus group to research and formulate a recommendation by:
Validating the premise of “fixed element” associated with the Long-Term Coal Contract
Examining the higher coal CF impacts on resources in the portfolio
Examining the known coal retirements impacts on remaining coal plants
Retirements listed in L&R submittals not in WECC 2028 HS1
The Focus Group findings:
“Long-Term Coal Contracts” relate to the infrastructure, which facilitates large capital investments and inflexibility with switching suppliers.
Increased CF from coal backs down Natural Gas CF.
Impacts are localized
CF on remaining coal plant increases as more coal retirements are realized.
PDWG voted unanimously to implement the discount of the CEC-PDWG approved coal prices to 75% of its initial value
Western Electricity Coordinating Council

31. Adjusting Coal Price Motion
Motion “It is moved that DS approves applying a discount in the PCM to the CEC-PDWG approved coal prices to 75% of its initial value”
Western Electricity Coordinating Council

32. Phase 2 Supplemental Resources
Approval Items
Phase 2
Supplemental Resources
Western Electricity Coordinating Council

33. Criteria for Adding Supplemental Resources
ADD planned resources from the 2018 WECC L&R Data Submittals
Missing Planned Resources, consistent with utility IRPs
Resources to meet legislated RPS, consistent with utility IRPs, by State
Absent of IRPs in an attempt to meet 1 & 2, draw on L&R Future Resources
Work with Data Submitters and Regions to validate added resources and to map supplemental resources, to the bus.
PDWG and WECC staff to validate assumptions and findings by working with Regions, Data Submitters and Stakeholders.
Western Electricity Coordinating Council

34. Coal Plant Retirements
The WECC staff accounted for plant retirement in the 2018 L&R data submittals as compared to those retired in the ADS case see Table 1 below. Approximately 4, 646 MW net capacity retirements, mostly covering coal plants, were in exceedance retirements in the L&R report. Results were addressed at PDWG and circulated for confirmation by the regions.
Western Electricity Coordinating Council

35. Western Electricity Coordinating Council
NTTG Edits
Coal Retirements: Dave Johnson 1,2,3&4, Naughton 3, Valmy 1&2 (50% in NTTG) (combined generating 1,500+ net MW)
Modify Wind Resources -- Energy Vision 2020
In PF, 1100 MW modeled on 10 generators but off-line (0 MW in PF)
In L&R, 1311 MW on 12 generators
960 MW not modeled, 8 projects in MT, OR, UT & WY
Add Solar Resources – add 300 MW not modeled, 19 projects in OR, UT, & WY
Western Electricity Coordinating Council

36. Western Electricity Coordinating Council
Motion
“It is moved that DS approves WECC staff make the NTTG edits available in the PCM master switch file.”
Western Electricity Coordinating Council

37. WestConnect Edits Edits (submitted by George Nail, PNM)
Under Construction
PNM Facebook Solar Energy Center 2 -- Already Constructed
PNM Facebook Solar Energy Center 3 – Already Constructed
PlannedInstall
Org Unit Name Unit Number Unit Type Nameplate Commission Date
(MW)
PNM Generic Combustion Turbine 1* GT /1/2023
PNM Generic Combustion Turbine 2* GT /1/2023
PNM Generic Combustion Turbine 3* GT /1/2023
PNM Generic Solar PV 1* PV-T /1/2019
* Location not yet determined
Western Electricity Coordinating Council

38. WestConnect Edit Edits by Lee Alter, TEP
Plant Retirements
H. Wilson Sundt ST1 and ST2 will retire 8/31/2019
“GeneratorListPCM” -- has “H Wilson Sundt 4 Coal” retirement date of 1/1/ V0.1 of that spreadsheet shows a retirement date of 12/31/2016 (actually stopped burning coal in 8/2015). Note, “H Wilson Sundt 4 Gas” has a commission date of 1/1/2017; the model would have both coal and gas as being on line at the same time, that’s impossible because it’s a single boiler and turbine that was dual fired, but the coal yard has been decommissioned.
Western Electricity Coordinating Council

39. Western Electricity Coordinating Council
TEP Edits
Plant Install
Table 3: Corrections in red were submitted ty Lee Alter, TEP, 09/18/2018.
Western Electricity Coordinating Council

40. Western Electricity Coordinating Council
West Connect Edits
Motion “It is moved that DS approves WECC staff compile edits into the PCM master switch file by PNM &TEP, described and coded by red above.”
Western Electricity Coordinating Council

41. ColumbiaGrid Edits Edits submitted by Kevin Harris
Under Construction
WECC 2018 L&R: PV 10 MW
Proposed:
Wind 1,750 MW
Hydro upgrades at Wanapum 2x18.2 MW
L&R Retirements:
Boardman listed: 12/31/2020
Not listed: Centralia (1,280 MW) and Colstrip 1&2 (614 MW)
Western Electricity Coordinating Council

42. Western Electricity Coordinating Council
ColumbiaGrid Edits
Integrated Resource Plan (IRP)
AVA:
Peaking 200 MW after CC contract expires
CG: Assumed CC PPA was renewed
Peaking 100 MW (2x50 MW)
PSE (by 2027):
Solar: 378 MW
Energy storage: 75 MW
Peaker: 717 MW
Total: 1,270 MW
 Motion
“It is moved that DS approves WECC staff implementing edits in the PCM by CoGrid as described above.”
Western Electricity Coordinating Council

43. California Edits Edits submitted by Yi Zhang, CAISO & Jose Dias, LADWP
Unit Name
Type
Retirement Date
Capacity (MW)
Gen Bus
Comments
CAISO
MossLandingCC1-Total
CCWhole-NatGas-Industrial
12/31/2030
467
Later retirement date
MossLandingCC2-Total
LADWP
Harbor CC
CC-NatGas
12/31/2050 65
26023
This is referenced to Harbor Unit 5. I believe the name was used to reference the CC as a whole
Haynes 1
ST-NatGas
1/1/2030
230
26026
Haynes 2
26027
Scattergood 2
180
26106
Western Electricity Coordinating Council

44. Western Electricity Coordinating Council
“Motion”
“It is moved that DS approves WECC staff compiling edits in the PCM master switch file by CAISO and LADWP entities as described in Table 4, above.”
Western Electricity Coordinating Council

45. Western Electricity Coordinating Council
Motion
“It is moved that DS approves WECC staff compiling additional edits in the PCM master switch file submitted by data owners by October 15, 2018.”
Western Electricity Coordinating Council

46. Western Electricity Coordinating Council
Contact Information
Jamie Austin
Western Electricity Coordinating Council