Transmission Planning Update October 20, 2010

Contents 2011 Biennial Transmission Expansion Plan Northwest Area Coordinator Study Team Activities Puget Sound Area Study Team Northern Mid-C Study Team Cross Cascades Study Team Wind Integration Study Team Development of WECC Plan

2011 Biennial Transmission Expansion Plan Draft report to be completed by the end of 2010 Board approval scheduled for February Current focus is on completing sensitivity studies Low Puget Sound Area Generation Closure of Centralia – Initial investigation only Further analysis of voltage stability issues Study Northern Mid-C area Transmission Plans 5-year light load case rerun with lower loads Effect of PSE’s Sammamish-Lakeside-Talbot upgrade

Northwest Area Coordinator A primary function of WECC is to create system models that are used for the planning and operation of the power grid 11 models per year WECC depends on “Area Coordinators” to develop portions of the overall WECC model. ColumbiaGrid officially began performing this function for the Northwest area on March 5, 2010 Previously performed by BPA BPA’s residual role ended on August 6 with the approval and posting of the final case that they had started WECC Base Case Coordination System to be implemented in 2012 will likely change the role of Area Coordinators

Northwest Area Coordinator –Activities to date Case development performance metrics (March-Oct) Four cases approved and posted on the WECC website Three additional cases under development CG web conferences with sub area coordinator participation Four previous web conferences Upcoming web conference November 9 Future web conferences to be held following each WECC SRWG meeting Under Discussion: CG to update already approved cases Prevent Northwest system model obsolescence Post updated data under the System Assessment website CG will perform system assessments for each new WECC planning case with updated data

Study Team Activities Puget Sound Area Study Team Northern Mid-C Study Team Cross Cascades Study Team Wind Integration Study Team

Area Plans – Puget Sound Area

Area Plans – Wenatchee Area Preferred Plan

Existing or Under Construction and Proposed Wind Resources

New Study Team Cross Cascades

Wind Integration Study Team Held a meeting on 10/14 Two main items Initiation of a task force to work on increasing dynamic transfer capability limits Request went out for technical support Several meetings planned with a Phase 1 report due in February Agree on how to calculate dynamic transfer limits Develop short and long-term ways to raise limits Completion of the report “Relative Northwest Benefits of Local vs. Remote Wind Generation”

Regional Transmission Expansion Planning Project (RTEP)

WECC Regional Transmission Expansion Planning (RTEP) project First interconnection-wide 10-year plan is on schedule to be completed in 2011 First 20-year plan is to be completed in 2013 WECC will not endorse specific projects or be involved in siting or cost allocation ColumbiaGrid supports this effort through participation on: TEPPC – Transmission Expansion Planning Policy Committee Responsible for developing the Plan - Jeff is a member and on the Steering Committee TAS – Technical Advisory Subcommittee Advises TEPPC - Marv is a member SWG - Studies Work Group Oversees completion of the studies - Marv is Chair Subregional Planning Group Coordination Group (SCG) Provides input to WECC from the subregional planning groups - Jeff is Chair

Subregional Planning Group Coordination Group (SCG)

FOUNDATIONAL PROJECTS BY 2020 Ver 1.0 - March 16, 2010 FOUNDATIONAL PROJECTS BY 2020 NTTG NTTG01 Gateway South Phase 1 NTTG02 Gateway Central Phase 1 NTTG03 Gateway West Phase 1 NTTG05 Hemingway – Boardman NTTG06 Cascade Crossing CG CG01 I-5 Corridor CG02 West McNary CG03 Big Eddy – Knight CG04 Little Goose Area Reinforcement BCH BCH01 Nicola – Meridian BCH03 BC-US Intertie Alberta AESO AESO03 1202L Conversion AESO04 Heartland AESO05 West HVDC AESO06 East HVDC AESO07 Fort McMurray - East Line AESO08 Fort McMurray - West Line CAISO CAISO02 Sunrise CAISO03 Blythe-Devers CAISO04 Tehachapi Upgrade SSPG SSPG02 SWIP South SSPG05 TCP Harry Allen - Northwest SSPG06 TCP Northwest – Amargosa SWAT SWAT01 PV-NG#2 SWAT06 Pinal Central – Tortolita SWAT07 Southeast Valley (SEV) SWAT08 PV - Morgan CCPG CCPG02 Pawnee – Smoky Hill CCPG03 Waterton- Midway CCPG04 San Luis Valley Alberta British Columbia AESO07 AESO08 Heartland AESO03 AESO04 Genesee Ellerslie AESO06 AESO05 Langdon Nicola Meridian BCH01 West Brooks Ingledow BCH03 Custer Washington CG02 CG04 Montana Castle Rock Lower Monumental Central Ferry CG01 Big Eddy CG03 Knight Troutdale McNary John Day Coyote Spgs Bethel NTTG06 Boardman NTTG05 Idaho Oregon Hemingway Midpoint Wyoming NTTG03 Populus Aeolus NTTG03 NTTG02 Bridger Terminal NTTG01 Oquirrh Pawnee Nevada Limber CCPG02 Robinson Mona NTTG01 Waterton Smoky Hill Sigurd CCPG03 California SSPG02 Midway Utah Colorado Amargosa SSPG05 Red Butte Comanche Legend 500 kV Single Circuit Line 345 kV Single Circuit Line 500 kV Double Circuit Line 345 kV Double Circuit Line DC Circuit (various voltage) Termination Substations Intermediate Substations Calumet Highwind SSPG06 CCPG04 Northwest Harry Allen CAISO04 Antelope Windhub Eldorado Arizona Pardee Vincent Devers SWAT08 Morgan Blythe CAISO03 Browning SWAT07 New Mexico Peňesquitos Imperial SWAT01 CAISO02 Palo Verde North Gila II Pinal Central SWAT06 Tortolita Final - Ver. 7.0, July 22, 2010 (1) Map does not reflect 230 or 240 kV lines that are included in the Foundational Transmission Project List. (2) Internal reinforcements projects not shown for clarity. (3) Lines shown are for illustrative purposes only and may not reflect final line routing. Draft Document

Future SCG Activities Coordinate activities between SPG’s More formal review of neighboring SPG Plans Assist WECC by populating the Transmission Project Information Portal http://www.wecc.biz/planning/transmissionexpansion/transmission/Pages/default.aspx Assist WECC with the reliability analysis of the 10-year plan

Questions?