Puget Sound AreaPuget Sound AreaNorthern Intertie Northern Intertie

(“PSANI”) (“PSANI”) Transmission HistoryTransmission History

ColumbiaGridColumbiaGrid September 24, 2007September 24, 2007

Snohomish County Public Utility District Snohomish County Public Utility District

John D. MartinsenJohn D. Martinsen

PSANI HistoryPSANI History

Historical BPA PlansHistorical BPA Plans April 2003 Curtailments April 2003 Curtailments Meeting of the MindsMeeting of the Minds Current StatusCurrent Status

Historical BPA PlansHistorical BPA Plans Excerpts from the BPA 1991 – 2000 Transmission Excerpts from the BPA 1991 – 2000 Transmission

System Facilities Ten Year Development planSystem Facilities Ten Year Development plan King County System Reinforcements (second Monroe to King County System Reinforcements (second Monroe to

Echo Lake 500kV)Echo Lake 500kV) Planned energization in 1997Planned energization in 1997

Puget Sound Area Reinforcement (double circuit Chief Puget Sound Area Reinforcement (double circuit Chief Joseph to Monroe upgraded to 500kV & tie to Snohomish )Joseph to Monroe upgraded to 500kV & tie to Snohomish )

(Planned energization in 2000)(Planned energization in 2000)

Little support for new transmission during this period Little support for new transmission during this period due to regulatory uncertainty – NEPA 1992due to regulatory uncertainty – NEPA 1992

King County System ReinforcementsKing County System Reinforcements ……New Monroe to New Monroe to

Echo Lake 500kV Echo Lake 500kV line line

Reinforcement is Reinforcement is required to required to eliminate the eliminate the heavy loading on heavy loading on the underlying the underlying 230kV system 230kV system during an outage during an outage of the existing of the existing Monroe-Echo Monroe-Echo Lake Lake

King County System ReinforcementsKing County System Reinforcements

Puget Sound Area ReinforcementPuget Sound Area Reinforcement

Replace existing Chief Replace existing Chief Joseph – Monroe 345kV Joseph – Monroe 345kV double circuit lines with a double circuit lines with a 500kV double circuit line 500kV double circuit line to Monroe and to Monroe and Snohomish Snohomish

..capacity may not be ..capacity may not be sufficient beyond 2000 if sufficient beyond 2000 if load growth is higher than load growth is higher than expected or the Canadian expected or the Canadian Entitlement return must Entitlement return must be delivered to Blainebe delivered to Blaine

Puget Sound Area ReinforcementPuget Sound Area Reinforcement

April 2003 - CurtailmentsApril 2003 - Curtailments April 2003 the Canadian Entitlement April 2003 the Canadian Entitlement

return increased from 630MW to return increased from 630MW to 1,149MW1,149MW

Curtailments and curtailment notices Curtailments and curtailment notices became a regular occurrence for Puget became a regular occurrence for Puget Sound utilities and PowerexSound utilities and Powerex

Meeting of the MindsMeeting of the Minds Soon after April 2003 BPA, Puget Sound utilities, Soon after April 2003 BPA, Puget Sound utilities,

and Powerex metand Powerex met A short-term Redispatch was agreed to by the Puget A short-term Redispatch was agreed to by the Puget

Sound and Powerex partiesSound and Powerex parties The Puget Sound Area Study Group (“PSASG”) was The Puget Sound Area Study Group (“PSASG”) was

formed under the Northwest Power Pool (“NWPP”) formed under the Northwest Power Pool (“NWPP”) Northwest Transmission Assessment Committee Northwest Transmission Assessment Committee (“NTAC”) (“NTAC”)

Puget Sound Area Upgrade Study Report was Puget Sound Area Upgrade Study Report was completed by the PSASG -November 2004completed by the PSASG -November 2004

Current StatusCurrent Status The Canadian Entitlement may increase to 1500 MWThe Canadian Entitlement may increase to 1500 MW Puget Sound Area loads are growingPuget Sound Area loads are growing Both wire and non-wire alternatives have been Both wire and non-wire alternatives have been

reviewedreviewed Most of the major Transmission reinforcements Most of the major Transmission reinforcements

reviewed would take eight to ten years to completereviewed would take eight to ten years to complete Incremental upgrades and operating procedures have Incremental upgrades and operating procedures have

resulted in reduced curtailment riskresulted in reduced curtailment risk No major (i.e. 500 kV) Puget Sound area No major (i.e. 500 kV) Puget Sound area

transmission expansion is currently moving forward transmission expansion is currently moving forward

Canadian Entitlement ReturnsCanadian Entitlement Returns

Entitlement Capacity (MW)

Year Returned to BC

2001-02 768

2002-03 630 then 1149

2003-04 1,154

2004-05 1,154

2005-06 1,195

2006-07 1,221

2007-08 1,217

2008-09 1,222

2009-10 1,327

2010-11 1,291

2011-12 1,289