Westside Northern Intertie (BC-US) Nomograms Index Page

The nomograms listed below are currently available for use depending on system conditions. Limits will be calculated by interpolating between nomogram points based on the actual Puget Sound Energy, Snohomish PUD and Seattle City Light generation levels and the ambient temperature at Snohomish, Washington. Additional interpolation is done between the 'high load' and 'low load' nomograms based on the measured Puget Sound Area Net Load. The calculation of net load is the sum of measured line flows into the area and the generation in the area.

For more information, please contact:
Frank Puyleart , BPAT Technical Operations, at (360) 418-2464
John Anasis , BPAT Technical Operations, at (360) 418-2263

Scheduled Outages

Date(s)Study #Outage Description N-S S-N
05/15/08 -
09/10/08
651
Bellingham 230/115kV Bank #1 HIGH LOAD  
LOW LOAD		 HIGH LOAD  
LOW LOAD
09/02/08 -
09/15/08
885
 Bothell-Canal 115kV Line, Bothell-Shoreline 115kV Line
& Monroe 500/230kV Transformer Bank #1		 HIGH LOAD  
LOW LOAD		 HIGH LOAD  
LOW LOAD
09/02/08 -
09/10/08
894
Bellingham 230/115kV Transformer Bank #1, Bothell-Canal 115kV Line, Bothell-Shoreline 115kV Line
& Monroe 500/230kV Transformer Bank #1		 HIGH LOAD  
LOW LOAD		 HIGH LOAD  
LOW LOAD
09/02/08 -
09/05/08
881
Bellingham 230/115kV Transformer Bank #1 & Snohomish-Bothell #1 230kV Line HIGH LOAD  
LOW LOAD		 HIGH LOAD  
LOW LOAD
09/02/08 -
09/05/08
882
Bellingham 230/115kV Transformer Bank #1, Snohomish-Bothell #1 230kV Line, Bothell-Canal 115kV Line,
Bothell-Shoreline #1 115kV Line & Monroe 500/230kV Transformer Bank #1		 HIGH LOAD  
LOW LOAD		 HIGH LOAD  
LOW LOAD
09/02/08 -
09/04/08
883
Bellingham 230/115kV Transformer Bank #1, Snohomish-Bothell #1 230kV Line, Bothell-Canal 115kV Line,
Bothell-Shoreline #1 115kV Line, Monroe 500/230kV Transformer Bank #1 & Custer-Ingledow #1 500kV Line		 HIGH LOAD  
LOW LOAD		 HIGH LOAD  
LOW LOAD
09/02/08 -
09/04/08
887R1
Bellingham 230/115kV Transformer Bank #1, Bothell-Canal 115kV Line, Bothell-Shoreline 115kV Line,
Monroe 500/230kV Transformer Bank #1 & Custer-Ingledow #1 500kV Line		 HIGH LOAD  
LOW LOAD		 HIGH LOAD  
LOW LOAD
09/06/08
888R1
Bellignham 230/115kV Transformer Bank #1, Bothell-Canal 115kV Line, Bothell-Shoreline 115kV Line,
Monroe 500/230kV Transformer Bank #1 & SnoKing 115kV Bus Section #2		 HIGH LOAD  
LOW LOAD		 HIGH LOAD  
LOW LOAD
09/08/08 -
09/12/08
890
Bothell-Canal 115kV Line, Bothell-Shoreline 115kV Line, Monroe 500/230kV Transformer Bank #1
& Rocky Reach-Maple Valley #1 345kV Line with Bellingham 230/115kV Transformer Bank #1 IN or O/S		 HIGH LOAD  
LOW LOAD		 HIGH LOAD  
LOW LOAD
09/10/08
891
Bothell-Canal 115kV Line, Bothell-Shoreline 115kV Line, Monroe 500/230kV Transformer Bank #1,
Rocky Reach-Maple Valley #1 345kV Line & Custer 500/230kV Transformer Bank #1
with Bellingham 230/115kV Transformer Bank #1 IN or O/S		 HIGH LOAD  
LOW LOAD		 HIGH LOAD  
LOW LOAD
09/08/08 -
09/12/08
907
Bothell-Canal 115kV Line, Bothell-Shoreline 115kV Line, Monroe 500/230kV Transformer Bank #1,
Rocky Reach-Maple Valley #1 345kV Line & Covington-Columbia #3 230kV Line
with Bellingham 230/115kV Transformer Bank #1 IN or O/S		 HIGH LOAD  
LOW LOAD		 HIGH LOAD  
LOW LOAD
09/10/08
908
Bothell-Canal 115kV Line, Bothell-Shoreline 115kV Line, Monroe 500/230kV Transformer Bank #1,
Rocky Reach-Maple Valley #1 345kV Line, Custer 500/230kV Transformer Bank #1
& Covington-Columbia #3 230kV Line with Bellingham 230/115kV Transformer Bank #1 IN or O/S		 HIGH LOAD  
LOW LOAD		 HIGH LOAD  
LOW LOAD
09/12/08 -
09/14/08
914
Bothell-Canal 115kV Line, Bothell-Shoreline 115kV Line, Monroe 500/230kV Transformer Bank #1
& Covington-Maple Valley #2 230kV Line		 HIGH LOAD  
LOW LOAD		 HIGH LOAD  
LOW LOAD
09/15/08
897
Bothell-Canal 115kV Line, Bothell-Shoreline 115kV Line, Monroe 500/230kV Transformer Bank #1
& Bellingham Area Load Tripping RAS (BALTS)		 HIGH LOAD  
LOW LOAD		 HIGH LOAD  
LOW LOAD
09/16/08
902
Sedro Woolley-Bothell-Horse Ranch Tap #1 230kV Line & Covington 500/230kV Transformer Bank #4
(SN Separation Scheme @ 100MW;PSE Operating Procedure)		 HIGH LOAD  
LOW LOAD		 HIGH LOAD  
LOW LOAD
09/16/08 -
09/19/08
904
Bothell-Horse Ranch Tap section of Sedro Woolley-Bothell-Horse Ranch Tap #1 230kV Line
& Covington 500/230kV Transformer Bank #4 (SN Separation Scheme @ 100MW)		 HIGH LOAD  
LOW LOAD		 HIGH LOAD  
LOW LOAD
09/20/08 -
10/31/08
905
Bothell-Horse Ranch Tap section of Sedro Woolley-Bothell-Horse Ranch Tap #1 230kV Line
& Snohomish-Murray #1 230kV Line (SN Separation Scheme @ 100MW)		 HIGH LOAD  
LOW LOAD		 HIGH LOAD  
LOW LOAD
09/22/08
910
Bothell-Horse Ranch Tap section of Sedro Woolley-Bothell-Horse Ranch Tap #1 230kV Line,
Snohomish-Murray #1 230kV Line & Covington 230kV West Main Bus
(SN Separation Scheme @ 100MW)		 HIGH LOAD  
LOW LOAD		 HIGH LOAD  
LOW LOAD
09/22/08 -
10/03/08
911
Bothell-Horse Ranch Tap section of Sedro Woolley-Bothell-Horse Ranch Tap #1 230kV Line,
Snohomish-Murray #1 230kV Line, Covington 500/230kV Transformer Bank #5
& Covington-Duwamish #1 230kV Line (SN Separation Scheme @ 100MW)		 HIGH LOAD  
LOW LOAD		 HIGH LOAD  
LOW LOAD
09/22/08 -
10/03/08
912
Bothell-Horse Ranch Tap section of Sedro Woolley-Bothell-Horse Ranch Tap #1 230kV Line,
Covington 500/230kV Transformer Bank #5 & Covington-Duwamish #1 230kV Line
(SN Separation Scheme @ 100MW)		 HIGH LOAD  
LOW LOAD		 HIGH LOAD  
LOW LOAD
09/23/08
913
Bothell-Horse Ranch Tap section of Sedro Woolley-Bothell-Horse Ranch Tap #1 230kV Line,
Snohomish-Murray #1 230kV Line Covington 500/230kV Transformer Bank #5,
Covington-Duwamish #1 230kV Line & Bellingham Area Load Trippign Scheme [BALTS]
(SN Separation Scheme @ 100MW)		 HIGH LOAD  
LOW LOAD		 HIGH LOAD  
LOW LOAD

Summer 2008 Season Outage Nomograms

Study #Outage Description N-S S-N
700
All Lines in Service HIGH LOAD  
LOW LOAD		 HIGH LOAD  
LOW LOAD
701
Bellingham-Custer #1 230kV Line HIGH LOAD  
LOW LOAD		 HIGH LOAD  
LOW LOAD
702
Bothell (SCL)-Horse Ranch Tap section of Sedro Woolley (PSE)-Bothell (SCL)-Horse Ranch 230kV Line
(S>N NI SEP ARMED AT 100MW) 		HIGH LOAD  
LOW LOAD		 HIGH LOAD  
LOW LOAD
703
Bothell-Sammamish (PSE) #1 230kV Line HIGH LOAD  
LOW LOAD		 HIGH LOAD  
LOW LOAD
704
Bothell-Sno-King #1 or #2 230kV Line HIGH LOAD  
LOW LOAD		 HIGH LOAD  
LOW LOAD
705
Bothell-Sno-King #1 & #2 230kV Lines HIGH LOAD  
LOW LOAD		 HIGH LOAD  
LOW LOAD
706
Bothell-University 115kV Line (SCL) HIGH LOAD  
LOW LOAD		 HIGH LOAD  
LOW LOAD
707
Broad Street-East Pine 115kV Line (SCL) HIGH LOAD  
LOW LOAD		 HIGH LOAD  
LOW LOAD
708
Broad Street-Union 115kV Line (SCL) HIGH LOAD  
LOW LOAD		 HIGH LOAD  
LOW LOAD
709
Canal-Broad Street 115kV Line (SCL) HIGH LOAD  
LOW LOAD		 HIGH LOAD  
LOW LOAD
710
Canal-Viewland 115kV Line (SCL) HIGH LOAD  
LOW LOAD		 HIGH LOAD  
LOW LOAD
711
Chief Joseph-Monroe #1 500kV Line HIGH LOAD  
LOW LOAD		 HIGH LOAD  
LOW LOAD
712
Chief Joseph-Snohomish #3 or #4 345kV Line
***Includes corresponding Chief Joseph & Snohomish 345/230kV Banks 		HIGH LOAD  
LOW LOAD		 HIGH LOAD  
LOW LOAD
713
Chief Joseph-Snohomish #3 or #4 operating at 230kV HIGH LOAD  
LOW LOAD		 HIGH LOAD  
LOW LOAD
714
Christopher Tap-O’Brien (PSE) sect. of Tacoma-Covington #2 230kV Line HIGH LOAD  
LOW LOAD		 HIGH LOAD  
LOW LOAD
715
Covington-Creston (SCL) #1 230kV Line HIGH LOAD  
LOW LOAD		 HIGH LOAD  
LOW LOAD
716
Covington-Duwamish (SCL) #1 230kV Line HIGH LOAD  
LOW LOAD		 HIGH LOAD  
LOW LOAD
717
Covington-Maple Valley #2 230kV Line HIGH LOAD  
LOW LOAD		 HIGH LOAD  
LOW LOAD
718
Custer 500/230kV Transformer Bank #1 HIGH LOAD  
LOW LOAD		 HIGH LOAD  
LOW LOAD
699
Custer 500/230kV Transformer Bank #2 HIGH LOAD  
LOW LOAD		 HIGH LOAD  
LOW LOAD
719
East Pine 230/115kV Transformer Bank (SCL) HIGH LOAD  
LOW LOAD		 HIGH LOAD  
LOW LOAD
720
Echo Lake-Maple Valley #1&2 500kV Line
***Includes Maple Valley 500/230kV Transformer Bank #2 		HIGH LOAD  
LOW LOAD		 HIGH LOAD  
LOW LOAD
721
Echo Lake-Maple Valley #1&2 500kV Line
***Includes Maple Valley 500/230kV Transformer Bank #2
(Covington-Creston 230kV Bypassed to Covington 230kV West Bus) 		HIGH LOAD  
LOW LOAD		 HIGH LOAD  
LOW LOAD
722
Echo Lake-Monroe-Sno-King #1 500kV Line HIGH LOAD  
LOW LOAD		 HIGH LOAD  
LOW LOAD
723
Horse Ranch Tap section of Monroe-Snohomish-Horse Ranch #1 230kV Line
***Includes Horse Ranch Tap sect. of Sedro-Bothell-Horse Ranch 230kV Line
(S>N NI SEP ARMED AT 100MW) 		HIGH LOAD  
LOW LOAD		 HIGH LOAD  
LOW LOAD
724
Massachusetts-Union Tap-Broad St 115kV Line (SCL) HIGH LOAD  
LOW LOAD		 HIGH LOAD  
LOW LOAD
725
Monroe 500/230kV Transformer Bank #1 HIGH LOAD  
LOW LOAD		 HIGH LOAD  
LOW LOAD
726
Monroe-Custer #1 500kV Line HIGH LOAD  
LOW LOAD		 HIGH LOAD  
LOW LOAD
698
Monroe-Custer #2 500kV Line HIGH LOAD  
LOW LOAD		 HIGH LOAD  
LOW LOAD
727
Monroe-Sammamish (PSE) #1 230kV Line HIGH LOAD  
LOW LOAD		 HIGH LOAD  
LOW LOAD
728
Monroe-Snohomish-Horse Ranch Tap #1 230kV Line
***Includes Horse Ranch Tap sect. of Sedro-Bothell-Horse Ranch 230kV Line
(N>S GENERATION DROP ARMED AT 400MW) 		HIGH LOAD  
LOW LOAD		 HIGH LOAD  
LOW LOAD
729
Murray-Custer #1 230kV Line
(S>N NI SEP ARMED AT 100MW) 		HIGH LOAD  
LOW LOAD		 HIGH LOAD  
LOW LOAD
730
Raver-Echo Lake #1 500kV Line HIGH LOAD  
LOW LOAD		 HIGH LOAD  
LOW LOAD
731
Raver-Echo Lake #1 500kV Line
(Covington-Creston 230kV Bypassed to Covington 230kV West Bus) 		HIGH LOAD  
LOW LOAD		 HIGH LOAD  
LOW LOAD
732
Rocky Reach (CHPD)-Maple Valley #1 345kV Line
***Including Maple Valley & Rocky Reach 345/230kV Transformer Banks 		HIGH LOAD  
LOW LOAD		 HIGH LOAD  
LOW LOAD
733
Rocky Reach (CHPD)-Maple Valley #1 operating at 230kV HIGH LOAD  
LOW LOAD		 HIGH LOAD  
LOW LOAD
734
Sammamish (PSE)-Maple Valley #1 230kV Line HIGH LOAD  
LOW LOAD		 HIGH LOAD  
LOW LOAD
735
Schultz-Echo Lake #1 500kV Line HIGH LOAD  
LOW LOAD		 HIGH LOAD  
LOW LOAD
736
Sedro Woolley (PSE)-Bellingham #1 230kV Line HIGH LOAD  
LOW LOAD		 HIGH LOAD  
LOW LOAD
737
Sedro Woolley (PSE)-Bothell (SCL)-Horse Ranch 230kV Line
***Includes Horse Ranch Tap section of Monroe-Snohomish 230kV Line
(S>N NI SEP ARMED AT 100MW; PSE OPERATING PROCEDURE) 		HIGH LOAD  
LOW LOAD		 HIGH LOAD  
LOW LOAD
738
Sedro Woolley (PSE) Tap section of Murray - Custer #1 230kV Line HIGH LOAD  
LOW LOAD		 HIGH LOAD  
LOW LOAD
739
Snohomish-Bothell (SCL) #1 or #2 230kV Line HIGH LOAD  
LOW LOAD		 HIGH LOAD  
LOW LOAD
740
Snohomish-Murray #1 230kV Line
(S>N NI SEP ARMED AT 100MW) 		HIGH LOAD  
LOW LOAD		 HIGH LOAD  
LOW LOAD
741
Sno-King 500/230kV Transformer Bank #4
***Includes Sno-King Tap sect of Echo Lake-Monroe-Sno-King 500kV Line
(S>N NI SEP ARMED AT 100MW) 		HIGH LOAD  
LOW LOAD		 HIGH LOAD  
LOW LOAD
742
Sno-King-Maple Valley #1 or #2 230kV Line HIGH LOAD  
LOW LOAD		 HIGH LOAD  
LOW LOAD
743
Sno-King-Maple Valley #1 & #2 230kV Lines HIGH LOAD  
LOW LOAD		 HIGH LOAD  
LOW LOAD
744
Tacoma-Covington #2 230kV Line
***Includes Christopher Tap-O’Brien section of Tacoma-Covington #2 Line 		HIGH LOAD  
LOW LOAD		 HIGH LOAD  
LOW LOAD
745
Tacoma-Covington #3 or #4 230kV Line HIGH LOAD  
LOW LOAD		 HIGH LOAD  
LOW LOAD
746
Tacoma-Raver #1&2 500kV Line
***Includes Tacoma 500/230kV Transformer Bank #5 		HIGH LOAD  
LOW LOAD		 HIGH LOAD  
LOW LOAD
747
University-Broad Street 115kV Line (SCL) HIGH LOAD  
LOW LOAD		 HIGH LOAD  
LOW LOAD

Season Outage Nomograms

Summer08nomograms.zip
Summer07nomograms.zip