1. ColumbiaGrid Planning Update to PCC Marv Landauer October 7, 2014

2. ColumbiaGrid Planning
Variable Transfer Limit Studies for COI
Regional Planning Processes
Order 1000
2015 Biennial Plan
Economic Planning Studies

3. Members and Planning Participants
Avista Corporation
Bonneville Power Administration
Chelan County PUD
Cowlitz County PUD
Douglas County PUD
Enbridge
Grant County PUD
Puget Sound Energy
Seattle City Light
Snohomish County PUD
Tacoma Power

4. Variable Transfer Limit Study for COI
Updates to VTL numbers for EIM implementation
Utilizing collaborative methodology developed last spring

5. VTL Methodology 1. Customer Service Impacts
Acceptable voltage ranges for transmission busses
2. System Equipment Impacts
No manual operation of equipment especially RAS within the scheduling period
3. Reliability Impacts
Contingency analysis of critical points from #1 and #2

6. VTL Study for COI Power Engineers is performing the study
State Estimator cases used as starting points
Analyzing 2-week periods for 3 seasons
Spring (for Fall and Spring operations)
Winter
Summer

7. VTL Study for COI (cont)
Approximately 300+ cases per season
For COI study, simulate transfer between CA/PNW
CA generation: Midway and Bay Area
PNW generation: Gorge wind and Mid Columbia hydro
Ongoing study, anticipated completion – Oct 2014

8. WECC Regional Planning
Central Ferry-Lower Monumental Planning Review Group
PDCI Upgrade Project Rating
West of McNary Reinforcement Rating Process

9. Order 1000 FERC responded to ColumbiaGrid filing on September 18.
ColumbiaGrid is comprised of both jurisdictional and non-jurisdictional members
Cost allocations are binding to enrolled members
Non-jurisdictionals can choose to enroll
60 days to refile with FERC

10. Biennial Plan Sensitivity Studies
Four sensitivity studies are ongoing
Comprehensive N-1-1 outages study
NW Washington Load Area IROL verification in the planning horizon
Post Contingency voltage angle differences
Maximum area generation during light load
The study results will be presented in upcoming planning meetings and included in the next Biennial Plan

11. Economic Planning Study
Backcast 2010:
Backcast power flow on key paths within WECC
West of Cascades North and South, Montana to NW, Idaho to NW, COI, PDCI, WOR, ..
Input actual loads, fuel cost, transmission system,
Learn what modeling techniques are required to mimic historic operations
Forecast 2014, and 2017:
Apply lessons learned in the backcast to the forecast runs.
This assumes that future operations will mimic historic operations
Compare loading of lines/paths, congestion, change in flow patterns and area losses

12. Economic Planning Study
Coal Retirement Study:
Evaluate location impact of replacement capacity for Centralia on the Pacific Northwest transmission system
Three areas are being considered for replacement capacity: Centralia area, North of Seattle, and Stanfield Area (McNary to Boardman)
Replacement capacity is assumed to be combine cycle
Run with 2017 loads: This eliminates the need to install new capacity to meet load growth and reserves for 2024 (+19,000 MW of additional supply)
Include announced Coal retirements, replacement projects and fuel conversion to NG (impacting 6,500 MW of ST-Coal from 2013)
Include California Once Through Cooling retirements
Sensitivities on potential retirement of Colstrip 1&2 and additional wind in Montana

13. Questions?