Flowgate BPA meters and publishes flows for. Drawn as the 3 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: S-N TTC mode 1,827 MW (range 1,819-1,959)
bpa_paths.csv; path_id=north-of-pearl; source=https://www.bpa.gov/-/media/Aep/transmission/atc-methodology/ATCID_V88_11FEB2026.pdf
Publisher & attribution ↗ Cite this released fact ↗Reading the latest published values…
From Pearl to Keeler / Sherwood / McLoughlin. Sign convention: south to north positive. Drawn as the named BPA lines
Five-minute actual flow and TTC from BPA's OPI feed
Curated from BPA Transmission Services, reviewed 2026-09-18.
Introduced 2023; metered at Pearl, positive S>N only, Pearl-Keeler counted only when flowing S>N (2025 Transmission Plan 9.14; ATCID V88 footnote 6); partial: BPA/PGE McLoughlin-Pearl-Sherwood 230 kV three-terminal line not in BPA line file; Pearl-Sherwood No 1 and No 2 are BPA/PGE jointly owned; OASIS path NOPE_S>N; no xlsx on PathFileLocations page, series present in icf_data_summary.csv 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