Flowgate BPA meters and publishes flows for, WECC Path 5. Drawn as the 12 BPA lines that make up the cut. A metered cut plane, not a single wire.
2026-09-18
BPA's published TTC series for the path (mode over the 30-day OPI window) or the WECC path rating where BPA publishes none; a directional operating limit, not a sum of line ratings
2026-09-18 · reported · curated · valid · final
BPA OPI TTC series 2026-08-18..09-17: E-W TTC mode 5,779 MW (median 4,998; range 4,467-5,779); WECC Path 5 other rating 7,200 MW E-W and W-E (not an accepted rating)
bpa_paths.csv; path_id=west-of-cascades-south; source=https://www.bpa.gov/-/media/Aep/transmission/atc-methodology/ATCID_V88_11FEB2026.pdf
Publisher & attribution ↗ Cite this released fact ↗From Big Eddy / Ashe / Buckley / John Day / McNary / Jones Canyon / Midway / Knight to Ostrander / Marion / Ross / Santiam / Chemawa / McLoughlin / Troutdale / North Bonneville. Sign convention: east to west positive. Drawn as the named BPA lines
BPA publishes this path in its OPI CSV (15-minute); not yet collected live
Curated from BPA Transmission Services, reviewed 2026-09-18.
ATCID V88 name Cross Cascades South (OASIS C-CACS_S); partial: PGE Round Butte-Bethel 230 kV not in BPA line file; 2025 Transmission Plan 9.6 says the path only flows east to west; PI 43319 A path is a metered cut plane; its TTC is a directional operating limit for the whole path, never a rating of any single line, and flow on it is not attributable to one line.
Path definitions from BPA's OPI Paths page, ATCID V88 and 2025 Transmission Plan; ratings from BPA's OPI TTC series and the WECC 2026 Path Rating Catalog
A path is a metered cut plane; member lines are those BPA names, so partial cuts (non-BPA lines) are noted per row. TTC is a directional operating limit on the review date, not a rating of any line.
Bonneville Power Administration, Geospatial Services
This product was made for informational purposes only and was created with the best available data at time of production. It does not represent any legal information or boundaries. BPA GIS disclaims responsibility or liability for any data discrepancies or errors. No BPA endorsement; no engineering or rights-of-way use. Operating voltage is retained raw only; the source declares no unit.
Release 20260929T050546Z-51ae0f7d3c78 · Record JSON