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.
Please direct questions or comments to the Transmission Path Capacity Email Forum.
The outage information and operating limits provided on this website are for estimation and planning purposes only, and are subject to change in real time. BPA makes no representations or warranties of any kind, express or implied, about the accuracy of this information, or related graphics contained on this website, and disclaims any and all liability with respect thereto.
| Date(s) | Study # | Primary Outage Description | Other Outages | N-S | S-N | 11/01/09- 02/01/10 |
Massachusetts-Union #2 115kV Cable, Union Tap of Massachusetts-Broad Street 115kV Cable IN SERVICE | None | HIGH LOAD LOW LOAD |
HIGH LOAD LOW LOAD |
01/26/10- 01/29/10 |
Bothell-SnoKing #1 & #2 230kV Lines, Massachusetts-Union #2 115kV Cable, Union Tap of Massachusetts-Broad Street 115kV Cable IN SERVICE | None | HIGH LOAD LOW LOAD |
HIGH LOAD LOW LOAD |
|---|
| Study # | Outage Description | N-S | S-N | All Lines in Service | HIGH LOAD LOW LOAD |
HIGH LOAD LOW LOAD |
Bellingham-Custer #1 230kV Line | HIGH LOAD LOW LOAD |
HIGH LOAD LOW LOAD |
Bothell (SCL)-Horse Ranch Tap section of Sedro Woolley (PSE)-Bothell (SCL)-Horse Ranch 230kV Line |
HIGH LOAD LOW LOAD |
HIGH LOAD LOW LOAD |
Bothell-Sammamish (PSE) #1 230kV Line | HIGH LOAD LOW LOAD |
HIGH LOAD LOW LOAD |
Bothell-Sno-King #1 or #2 230kV Line | HIGH LOAD LOW LOAD |
HIGH LOAD LOW LOAD |
Bothell-Sno-King #1 & #2 230kV Lines | HIGH LOAD LOW LOAD |
HIGH LOAD LOW LOAD |
Bothell-University 115kV Line (SCL) | HIGH LOAD LOW LOAD |
HIGH LOAD LOW LOAD |
Broad Street-East Pine 115kV Line (SCL) | HIGH LOAD LOW LOAD |
HIGH LOAD LOW LOAD |
Broad Street-Union 115kV Line (SCL) | HIGH LOAD LOW LOAD |
HIGH LOAD LOW LOAD |
Canal-Broad Street 115kV Line (SCL) | HIGH LOAD LOW LOAD |
HIGH LOAD LOW LOAD |
Canal-Viewland 115kV Line (SCL) | HIGH LOAD LOW LOAD |
HIGH LOAD LOW LOAD |
Chief Joseph-Monroe #1 500kV Line | HIGH LOAD LOW LOAD |
HIGH LOAD LOW LOAD |
Chief Joseph-Snohomish #3 or #4 345kV Line ***Includes corresponding Chief Joseph & Snohomish 345/230kV Banks |
HIGH LOAD LOW LOAD |
HIGH LOAD LOW LOAD |
Chief Joseph-Snohomish #3 or #4 operating at 230kV | HIGH LOAD LOW LOAD |
HIGH LOAD LOW LOAD |
Christopher Tap-O’Brien (PSE) sect. of Tacoma-Covington #2 230kV Line | HIGH LOAD LOW LOAD |
HIGH LOAD LOW LOAD |
Covington-Creston (SCL) #1 230kV Line | HIGH LOAD LOW LOAD |
HIGH LOAD LOW LOAD |
Covington-Duwamish (SCL) #1 230kV Line | HIGH LOAD LOW LOAD |
HIGH LOAD LOW LOAD |
Covington-Maple Valley #2 230kV Line | HIGH LOAD LOW LOAD |
HIGH LOAD LOW LOAD |
Custer 500/230kV Transformer Bank #1 | HIGH LOAD LOW LOAD |
HIGH LOAD LOW LOAD |
Custer 500/230kV Transformer Bank #2 | HIGH LOAD LOW LOAD |
HIGH LOAD LOW LOAD |
East Pine 230/115kV Transformer Bank (SCL) | HIGH LOAD LOW LOAD |
HIGH LOAD LOW LOAD |
Echo Lake-Maple Valley #1&2 500kV Line with Covington-Creston in Normal Configuration ***Includes Maple Valley 500/230kV Transformer Bank #2 |
HIGH LOAD LOW LOAD |
HIGH LOAD LOW LOAD |
Echo Lake-Monroe-Sno-King #1 500kV Line | HIGH LOAD LOW LOAD |
HIGH LOAD LOW LOAD |
Horse Ranch Tap section of Monroe-Snohomish-Horse Ranch #1 230kV Line ***Includes Horse Ranch Tap sect. of Sedro-Bothell-Horse Ranch 230kV Line |
HIGH LOAD LOW LOAD |
HIGH LOAD LOW LOAD |
Massachusetts-Union Tap-Broad St 115kV Line (SCL) | HIGH LOAD LOW LOAD |
HIGH LOAD LOW LOAD |
Monroe 500/230kV Transformer Bank #1 | HIGH LOAD LOW LOAD |
HIGH LOAD LOW LOAD |
Monroe-Custer #1 500kV Line | HIGH LOAD LOW LOAD |
HIGH LOAD LOW LOAD |
Monroe-Custer #2 500kV Line | HIGH LOAD LOW LOAD |
HIGH LOAD LOW LOAD |
Monroe-Novelty Hill (PSE) #1 230kV Line | HIGH LOAD LOW LOAD |
HIGH LOAD LOW LOAD |
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 |
Murray-Custer #1 230kV Line (S>N NI SEP ARMED AT 100MW) | HIGH LOAD LOW LOAD |
HIGH LOAD LOW LOAD |
Raver-Echo Lake #1 500kV Line with Covington-Creston in Normal Configuration | HIGH LOAD LOW LOAD |
HIGH LOAD LOW LOAD |
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 |
Rocky Reach (CHPD)-Maple Valley #1 operating at 230kV | HIGH LOAD LOW LOAD |
HIGH LOAD LOW LOAD |
Sammamish (PSE)-Maple Valley #1 230kV Line ***Sammamish-Klahanie Section and/or Maple Valley-Klahanie Section |
HIGH LOAD LOW LOAD |
HIGH LOAD LOW LOAD |
Sammamish-Novelty Hill #2 230kV Line (PSE) | HIGH LOAD LOW LOAD |
HIGH LOAD LOW LOAD |
Schultz-Echo Lake #1 500kV Line | HIGH LOAD LOW LOAD |
HIGH LOAD LOW LOAD |
Sedro Woolley (PSE)-Bellingham #1 230kV Line | HIGH LOAD LOW LOAD |
HIGH LOAD LOW LOAD |
Sedro Woolley (PSE)-Bothell (SCL)-Horse Ranch 230kV Line ***Includes Horse Ranch Tap section of Monroe-Snohomish 230kV Line |
HIGH LOAD LOW LOAD |
HIGH LOAD LOW LOAD |
Sedro Woolley (PSE) Tap section of Murray - Custer #1 230kV Line | HIGH LOAD LOW LOAD |
HIGH LOAD LOW LOAD |
Snohomish-Bothell (SCL) #1 or #2 230kV Line | HIGH LOAD LOW LOAD |
HIGH LOAD LOW LOAD |
Snohomish-Murray #1 230kV Line (S>N NI SEP ARMED AT 100MW) | HIGH LOAD LOW LOAD |
HIGH LOAD LOW LOAD |
Sno-King 500/230kV Transformer Bank #4 ***Includes Sno-King Tap sect of Echo Lake-Monroe-Sno-King 500kV Line |
HIGH LOAD LOW LOAD |
HIGH LOAD LOW LOAD |
Sno-King-Maple Valley #1 or #2 230kV Line | HIGH LOAD LOW LOAD |
HIGH LOAD LOW LOAD |
Sno-King-Maple Valley #1 & #2 230kV Lines | HIGH LOAD LOW LOAD |
HIGH LOAD LOW LOAD |
Tacoma-Covington #2 230kV Line ***Includes Christopher Tap-O’Brien section of Tacoma-Covington #2 Line |
HIGH LOAD LOW LOAD |
HIGH LOAD LOW LOAD |
Tacoma-Covington #3 or #4 230kV Line | HIGH LOAD LOW LOAD |
HIGH LOAD LOW LOAD |
Tacoma-Raver #1&2 500kV Line***Includes Tacoma 500/230kV Transformer Bank #5 | HIGH LOAD LOW LOAD |
HIGH LOAD LOW LOAD |
University-Broad Street 115kV Line (SCL) | HIGH LOAD LOW LOAD |
HIGH LOAD LOW LOAD |
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| Winter10nomograms.zip |
| Winter09nomograms.zip |