What changed

Reactor status changes, capacity revisions and outage events

Most nuclear data sources tell you what exists. This page tells you what changed. It combines two streams: revisions to the underlying reactor dataset, and outage events derived from daily U.S. reactor power readings.

Outage events are reconstructed from the daily power archive covering 2025-08-21 to 2026-10-09. An outage here means a reactor recorded zero power for at least two consecutive days; single-day zero readings are ignored because they are usually reporting artefacts rather than real shutdowns.

Dataset changes are recorded going forward from the day tracking started. Unlike outages, they cannot be reconstructed after the fact: if a reactor quietly changes status and nobody snapshots it, that moment is gone.

Currently offline

Verified corrections

Records we corrected ourselves after live generation data contradicted the source dataset. Each one was checked against a primary source before being applied — never inferred from the measurement itself.

Dataset revisions

Changes that came from the upstream dataset itself.

Completed outages

Use this data

Machine-readable output: /api/changes. Filter with ?kind=outage or ?kind=dataset, and set ?limit=N. Method and sources are documented on the methodology page.