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Grid infrastructureJapanEIR-1226

Substation fire in Nagano City reported to have cut power to about 5,200 households

Sept 2026Published 24 Sept 2026Responsible editor: Chief Editor

SignificantThermal / fireProvisional
Estimated damageEstimated by the register's adjusterHow? Know the real figure?
Figure hidden: shown to subscribersLow confidence
supply cut for about •• daysShown in the record →Full estimate
From the recordRoot cause hidden
Where
Substation in Matsushiro-machi Saijo, Nagano City, Japan
What
Fire burned a net and cut power to about 5,200 households
Cause
Rat reported as possible cause
Outcome
Power cut to about 5,200 households for a time

What happened

On 22 September 2026, at about 5:20 pm, a fire was reported at a substation in Nagano City, Japan. The published lead places the incident in Matsushiro-machi Saijo, but the article is behind a paywall and the sentence is cut off, so the exact site name is not confirmed. The headline says the fire burned a net and that about 5,200 households lost power for a time. A rat is reported as a possible cause. Damage, injuries and how long the outage lasted are not known from the available text.

Contributing factors

The headline says a rat may have been the cause. No confirmed cause, failed component or sequence of events is given in the text that could be read.

Lessons learned

  1. A rat can bridge live equipment in a substation and start a fire, so operators should check entry points and barriers regularly.
  2. A local fire at a substation can interrupt supply to thousands of households, so operators must prepare rapid restoration plans.

More lessons on spacing, layout and fire spread, outages, backup supply and restoration, from every incident on the register.

Not yet known

  • Exact site name
  • Confirmed cause
  • Duration of the outage
  • Extent of damage

This entry is updated when these are reported. Get an alert for the next one like it.

Source

shinmai.co.jp

Published 2026-09-24. Written from public reporting. Descriptive, not investigative. See the data accuracy disclaimer.

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Chart to reuse with this story: Grid infrastructure incidents by year, free with a credit (PNG).

Grid infrastructure incidents in Japan: 3 entries, with a free alert for the next one.

Substation and transformer fires: the counts, the latest entries and a free alert for the next one.

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