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ColumbiaGrid UpdateJune 27, 2008

Activities

• Planning

• OASIS

• Redispatch

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Biennial Transmission Expansion Plan

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• System Assessment Completed• Leading 3 study teams

– Puget Sound Area– Olympic Peninsula– Northern Mid-C

• Initiating 6 sensitivity studies– Increased wind– low hydro– Cowlitz looped operation– Gas curtailment– Higher California transfers– Centralia out.

• Next Planning Meeting is July 10th

Biennial Plan

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Planning Area LoadsLegend

MW in 2008

MW in 2018

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Multi-System Violations requiring action this planning cycle

Multi-System Violations Involvingonly one CG Party

Future Needs

Single System Needs

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Wind Resources

Wind GrowthLegend

Operating or Under Construction

Proposed or in Queue

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1. Met on May 20th

2. Reviewed 2008 summer operating nomogram studies.

3. Analyzing the ability of the transmission system to simultaneously meet both local customer reliability needs and Canadian transfer requirements

• Study is being initiated to examine the effect that several potential transmission additions will have on reducing the likelihood of curtailments

• Study Plan approved at May 20th meeting• CG Staff is developing base cases for study• Working on automating the simulations to speed up study work

4. Working with Seattle City Light to develop expansion plans to address reliability concerns in the Northern downtown Seattle area.

• Several alternatives under consideration • Solution selected by SCL will be analyzed in #1 above

5. Acting as the WECC Project review group for the BCTC proposed Northern Intertie rating increase

• South to north only• From 2000 MW to as high as 3000 MW• Joint BCTC/ColumbiaGrid notice was sent out to WECC on April 25 th

• Study plan reviewed by group at May 20th meeting

Puget Sound Area Study Team

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OASIS Program

Goal is to have single OASIS interface that spans multiple transmission systems to improve customer access to transmission service.

•New Functional Agreement effective April 1, 2008

•Participants: Avista, BPA, Chelan PUD, Grant PUD, Puget Sound Energy, Seattle City Light, Snohomish PUD, Tacoma Power

•Currently hiring staff to begin program.

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2008:1. Develop common ATC methodology2. Facilitate development of common queues for

transmission service and interconnection requests3. Develop plan for a common web-based OASIS portal

2009 and beyond:1. Implement common OASIS portal that “points to”

participants’ individual OASIS platforms.2. Implement common ATC methodology and common

queues

OASIS Program Schedule

Redispatch Program• Improves the efficient use of the grid by increasing transmission

capability through the selective redispatch of generation

• Helps to bridge problems until transmission can be built

• ColumbiaGrid effort:– Builds on current BPA redispatch program– Looking to expand program across control area boundaries to include more

generator participants and increase benefits– May implement independent intra-hour energy bid market to facilitate

redispatch and act as energy balancing source. This may be particularly useful in integrating wind generation.

• Collaborative work to continue

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12Questions?