ColumbiaGrid Planning

Update to PCC

Marv LandauerOctober 7, 2014

Variable Transfer Limit Studies for COIRegional Planning ProcessesOrder 10002015 Biennial PlanEconomic Planning Studies

ColumbiaGrid Planning

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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 Power3

Members and Planning Participants

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Variable Transfer Limit Study for COI

Updates to VTL numbers for EIM implementation

Utilizing collaborative methodology developed last spring http://www.columbiagrid.org/download.cfm?DVID=3570

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

VTL Methodology

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VTL Study for COI

Power Engineers is performing the studyState Estimator cases used as starting

pointsAnalyzing 2-week periods for 3 seasons

Spring (for Fall and Spring operations) Winter Summer

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VTL Study for COI (cont)

Approximately 300+ cases per seasonFor 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

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WECC Regional Planning

1. Central Ferry-Lower Monumental Planning Review Group

2. PDCI Upgrade Project Rating3. West of McNary Reinforcement Rating

Process

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Order 10001. FERC responded to ColumbiaGrid filing on

September 18.2. ColumbiaGrid is comprised of both

jurisdictional and non-jurisdictional members

3. Cost allocations are binding to enrolled members

4. Non-jurisdictionals can choose to enroll5. 60 days to refile with FERC

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Biennial Plan Sensitivity StudiesFour 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

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Economic Planning StudyBackcast 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

operationsForecast 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

Economic Planning StudyCoal 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

Questions?