Nagano power outage: power restored in parts of Azumino and Matsumoto
Chubu Electric Power Grid said up to approximately 32,160 customer premises lost power in parts of Azumino and Matsumoto in Nagano Prefecture on 8 November 2026. The utility recorded the interruption from 09:31 to 11:26 Japan Standard Time, a maximum of 115 minutes.
Status of this incident
Restoration confirmed
Last known status: restored, according to the source · Power restored. The operator recorded the end of the outage at 11:26 JST on 8 November.
Source moment: Nov 8, 2026, 02:49 AM UTC (11:49 AM local time)
In 20 seconds
The operator reported about 31,100 affected premises in part of Azumino and about 1,060 in part of Matsumoto.
Chubu Electric Power Grid recorded the end of the outage at 11:26 JST.
The utility attributed the outage to a malfunction in customer equipment and did not identify the equipment.
How many premises lost power
The operator’s figures refer to customer premises. It reported approximately 31,100 affected premises in part of Azumino and approximately 1,060 in part of Matsumoto. The two figures describe the areas covered by this outage. They do not give an address list or say that every premises in either city lost electricity.
The 09:31 to 11:26 JST window is the full incident window in the operator’s report. It gives the longest possible interruption of 115 minutes. The statement does not show when power returned at individual addresses or how long each address went without electricity.
What the sources tell us, and what they do not
- Operator’s reported impact
- Up to approximately 32,160 customer premises.
- Outage window on 8 November
- 09:31 to 11:26 JST; maximum 115 minutes.
- Operator’s reported cause
- A malfunction in customer equipment. The equipment was not identified.
What the utility said about the cause
Chubu Electric Power Grid attributed the outage to a malfunction in customer equipment. It did not specify the equipment, its owner or what failed within it.
Rail service and electricity restoration
Nagano Broadcasting reported that JR Ōito Line service resumed at 10:45 JST and that power had returned to all affected premises by around 11:30 JST. The train service report is a separate milestone from the electricity restoration. For the end of the power outage, the operator’s incident statement gives the more precise time of 11:26 JST.
For a future interruption, the power outage essentials guide covers ways to keep lights and phones available. The runtime calculator can help estimate how long a backup battery can run those devices.