ProjectRegional context

Big Eddy-Chemawa 230/500 kV Line Upgrade

About this record

BPA transmission project. A project record with the source’s own status, dates and estimates. A proposal or connection request does not establish operation.

2026-07-29

BPA transmission project

Bonneville Power Administration
Portfolio cycleBPA’s planned transmission upgrades, with published status, cost estimates and expected dates.Definition ↗
GERP 1.0
Status
Scoping(filed as “SCOPING”)
Expected energization
2033
Bundle
BIG EDDY-CHEMAWA-1 500KV LINE REBUILD

BPA proposes to rebuild 91 miles of the existing Big Eddy-Chemawa #1 230 kV line to 500 kV line and re-terminate between BPA’s Big Eddy Substation (The Dalles, OR), Ostrander Substation (Oregon City, OR) and Pearl Substation (Wilsonville, OR).

Justification as BPA states it: Supports regional load growth, reliability needs and commercial requests for long-term transmission

Line segments

A planning bundle in BPA's Grid Expansion and Reinforcement Portfolio: status, expected energization and cost change with each cycle; not a permit, a contract or a route. Proposed line rebuilds and upgrades as BPA published them for its GERP cycle: expected energization year, estimated cost in dollars and status are BPA's planning figures at publication and change with each cycle; the geometry is the existing line the project follows, not a final route.

Map location unavailable. This plant remains part of the source inventory and tables.

Estimated cost
670,000,000USD
Source & method

The publisher's planning estimate for the project at publication (BPA GERP: nominal dollars as the layer carries it on the bundle, which does not say what it covers; BPA's summaries can state it for a group of projects); not a budget, contract or actual

2026-07-29 · reported · direct · valid · final

BPA's planning estimate as the layer carries it on this bundle at publication; nominal dollars. The layer does not say what it covers; BPA's project summaries can state it for a group of projects (group_name)

Bundle_ID=P05468; layer=lines

Publisher & attribution ↗ Cite this released fact ↗

Geographic & reporting context

A planning bundle in BPA's Grid Expansion and Reinforcement Portfolio: status, expected energization and cost change with each cycle; not a permit, a contract or a route. Proposed line rebuilds and upgrades as BPA published them for its GERP cycle: expected energization year, estimated cost in dollars and status are BPA's planning figures at publication and change with each cycle; the geometry is the existing line the project follows, not a final route.

Sources for this record

Frozen citation page ↗

Grid Expansion & Reinforcement Portfolio, line projects (Evolving Grid), layer 11

Bonneville Power Administration, Grid Expansion & Reinforcement Portfolio line projects (Evolving Grid), 2026

Proposed line rebuilds and upgrades as BPA published them for its GERP cycle: expected energization year, estimated cost in dollars and status are BPA's planning figures at publication and change with each cycle; the geometry is the existing line the project follows, not a final route.

Release 20260929T050546Z-51ae0f7d3c78 · Record JSON