{
 "aliases": [
  {
   "note": "Curated from BPA's OPI Paths page, ATCID and Transmission Plan; WECC path number where one applies",
   "relation": "exact",
   "review_state": "reviewed",
   "source_entity_id": "south-of-allston",
   "source_ref": "bpa-paths"
  }
 ],
 "bbox": [
  -123.06918205044302,
  45.548594075180674,
  -122.63024009201506,
  46.18111746124744
 ],
 "citation_path": "citations/path~bpa~south-of-allston.html",
 "direction": "north to south positive",
 "facts": [
  {
   "basis": "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",
   "coverage": null,
   "denominator": null,
   "evidence": "reported",
   "fact_id": "path:bpa:south-of-allston#path_ttc_mw",
   "label": "Total transfer capability",
   "locator": "bpa_paths.csv; path_id=south-of-allston; source=https://www.bpa.gov/-/media/Aep/transmission/atc-methodology/ATCID_V88_11FEB2026.pdf",
   "maturity": "final",
   "method": "curated",
   "metric": "path_ttc_mw",
   "missing_reason": null,
   "note": "BPA OPI TTC series 2026-08-18..09-17: N-S TTC mode 3,500 MW (range 3,297-3,500)",
   "period": {
    "as_of": "2026-09-18",
    "kind": "instant",
    "note": "Published limit on the review date; BPA's OPI TTC series varies by season and outage"
   },
   "precision": 0,
   "quality": "valid",
   "source_ref": "bpa-paths",
   "unit": "MW",
   "value": 3500.0
  }
 ],
 "geometry": {
  "from": "Allston / Lexington / St Helens",
  "mode": "lines",
  "note": "Drawn as the named BPA lines",
  "to": "Keeler / Ross / Portland"
 },
 "id": "path:bpa:south-of-allston",
 "kind": "flowgate",
 "kind_label": "Flowgate",
 "lines": [
  {
   "id": "line:bpa:KEEL-ALSN-1",
   "name": "Keeler-Allston No 1",
   "type": "line",
   "voltage_class": "500",
   "voltage_kv": 500.0
  },
  {
   "id": "line:bpa:ROSS-LEXI-1",
   "name": "Ross-Lexington No 1",
   "type": "line",
   "voltage_class": "230",
   "voltage_kv": 230.0
  },
  {
   "id": "line:bpa:STHL-ALSN-1",
   "name": "St Helens-Allston No 1",
   "type": "line",
   "voltage_class": "115-161",
   "voltage_kv": 115.0
  }
 ],
 "live": {
  "note": "BPA publishes this path in its OPI CSV (15-minute); not yet collected live",
  "series": null,
  "source": null
 },
 "name": "South of Allston",
 "note": "Partial: cut plane also has PGE Evergreen-St. Marys-Trojan 230 and Trojan-Harborton 230 (Trojan-St. Marys, Trojan-Rivergate in 2025 Transmission Plan 9.5), PacifiCorp Merwin-St. Johns 115, Astoria-Seaside 115, Clatsop 230/115 kV transformer (none in BPA line file); BPA TTC share per South of Allston allocation agreement (ATCID V88); OASIS path SOALSN; PI 65757 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.",
 "release_id": "20260929T050546Z-51ae0f7d3c78",
 "schema_version": "1.41.0",
 "source": {
  "publisher": "BPA Transmission Services",
  "reviewed_on": "2026-09-18",
  "reviewer": "claude-1d5",
  "url": "https://www.bpa.gov/-/media/Aep/transmission/atc-methodology/ATCID_V88_11FEB2026.pdf"
 },
 "source_name": null,
 "sources": [
  "bpa-lines",
  "bpa-paths"
 ],
 "type": "path",
 "updated_reason": null,
 "wecc_path": null
}