1. EPS Updates ColumbiaGrid Planning Meeting October 13, 2016

2. Outline Regional Coordination Power Flow & PCM
Planned PCM Modeling Changes
Results Northwest Exports to California

3. Regional Coordination
Bi-weekly meeting regional coordination call
First Segment: Regional review of active power flow case and PCM
Second Segment: PCM Modeling Review:
Issue in WECC PCM dataset
Summary of regional applied/planned changes to PCM
Discuses modeling with GridView
Data shared:
CAISO and WestConnect are have some issues exchanging
Exchange area set up by WestConnect
NTTG has made available the change set they applied for their reliability cases

4. Planned PCM Modeling Changes
WECC release WECC 2026CC v1.3: Aug 26, 2016
Applied NTTG change set
Implement ColumbiaGrid changes

5. Applied NTTG Corrections
NTTG Provided the 15 change set/scenario used in their Cases
Summary of change set/scenario:
Finished resource corrections provided by the four regions
1000+ changes
Removed duplicate transmission facilities
Energized open branches to connect 108 islanded generators to the system
Fixed interface definitions
Added Hemingway to Longhorn
Applied all NTTG change set to WECC 2026CC v1.3

6. PCM Clean Up Items #1 Coal cost by plant Correct hourly load:
Assume 50% of coal cost are fixed, therefore dispatch price is 50% of delivered cost
Correct hourly load:
Abnormal seasonal load shapes
Implementation of CA load forecast
Eliminate dispatchability in non-dispatchable supply: Changed GEO, CG, QF, Bio, and other non-dispatchable supply to flat monthly generation profile based on historic generation
Aggregated the core Columbia and Lower Snake River generation by plant. This eliminated 193 units
Delete Pancake wheeling cost with economic hurdles between major markets (NW, CA, SW, & RM)

7. PCM Clean Up Items #2
Complete Hydro changes sent to WECC. This allows CA Hydro to shift daily generation to respond to the “Duck Curve”
Switched most CA mid size Hydro from fixed hourly shape to Proportional Load Following (PLF)
Turned on Hydro scheduling to regional Load – Solar * %Solar Coefficient – Wind * %Wind Coefficient
Deleted station service load
Deleted temporal data: WECC has monthly changing capacity imbedded in dataset
Review key Interfaces definitions
Eliminate 25% min generation (commit and dispatch) in CA for dispatchable supply
Lower Start cost for CC and peakers

8. PCM Clean Up Items #3
Change modeling of “Asset Control Supply” from monthly (aMW) to hourly BPA surplus (BPA core Columbia river generation + CGS – BPA hourly load)
Correct NW Scheduled Maintenance: In the NW about a 1/3 of all thermal maintenance is scheduled during the fall. Shift most of the scheduled maintenance from the fall to spring.
Castaic PS: Lower PS Eff to operational average of 70%
BTM-PV is proportional distributed to all load busses

9. WECC 2026CC v1.3 Flow

10. ColumbiaGrid Flow

11. Observations
It is not uncommon to see hourly flow north on PDCI and south on COI
Asset Control Supply assumption set a ceiling or floor on California imports from the Northwest
CO2 import fee to California
Import from California would decrease if historic limits are used in Northwest

12. Compare Monthly Average Flow

13. Question: Kevin Harris (503) 943-4932 harris@columbiagrid.org