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