Browse the atlas
OverWatts AtlasCountriesOwnersInsightsWireChangesSources Live map
Asset classes
- Transmission Line80,968
- Power Plant32,429
- Substation / Converter7,614
- Oil & Gas Field7,055
- Coal / Uranium Mine5,382
- Pipeline4,951
- Cement Plant3,513
- Data Centre3,283
- Iron & Steel Plant1,293
- LNG Terminal1,198
- Grid Storage965
- Iron Ore Mine949
- Chemical Plant868
- Interconnector704
- Export Terminal519
- Refinery279
- Storage / Tank Farm38
- Oil / Commodity Contract19
- Hydrogen Project18
- Carbon Capture (CCS)16
Chokepoints
Grid Storage
Midono hydroelectric plant
29th-largest grid storage in Japan of 35 · top 83% worldwide (#792 of 965)
- Owner
- Tokyo Electric Power Company Holdings INC (TEPCO)
- Status
- operating
- Capacity
- 245 MW
- Technology
- pumped storage
- Commissioned
- 1969
- Also listed as
- A power plant — this site generates as well as stores
Comparable grid storages · Japan · 35 ranked
- #1Kannagawa hydroelectric plant2.8 GW
- #27Mazegawa Daiichi hydroelectric plant288 MW
- #28Shiroyama hydroelectric plant250 MW
- #29Midono hydroelectric plant245 MW
- #30Yagisawa hydroelectric plant240 MW
- #31Nagano hydroelectric plant220 MW
Grid connection · within 50 km
- Nearest substation
- 新信濃変電所
- Its voltage
- 500 kV
- Distance
- 12 km
- Strongest line nearby
- 500 kV
- Line operator
- 東京電力
- Substations in range
- 2
Mapped grid infrastructure from OpenStreetMap, whose coverage is excellent in some regions and sparse in others. Nothing shown here means nothing is mappednearby — not that the site is unconnected. Lines are matched on a segment’s midpoint, so a corridor passing directly overhead can be missed; this under-reports rather than invents.
Co-located infrastructure · within 25 km
- Midono hydroelectric plant0 m · Power Plant · 245 MW · hydro
- Azumi hydroelectric plant3.9 km · Power Plant · 623 MW · hydro
- Azumi Pumped Storage hydroelectric plant3.9 km · Power Plant · 412 MW · hydro
- Azumi Pumped Storage hydroelectric plant3.9 km · Grid Storage · 412 MW
- 500 kV line12 km · Transmission Line
- 新信濃変電所12 km · Substation / Converter
- 飛騨信濃直流幹線22 km · Transmission Line
- 信濃変電所23 km · Substation / Converter
On the interactive map
Watercourse: Azusa River
SOURCE: Global Energy Monitor · Global Integrated Power, March 2026 (CC BY 4.0)