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
Kannagawa hydroelectric plant
Largest grid storage in Japan of 35 · top 2% worldwide (#13 of 965)
- Owner
- Tokyo Electric Power Company Holdings INC (TEPCO)
- Status
- operating
- Capacity
- 2,820 MW
- Technology
- pumped storage
- Commissioned
- 2005
- Also listed as
- A power plant — this site generates as well as stores
Comparable grid storages · Japan · 35 ranked
- #1Kannagawa hydroelectric plant2.8 GW
- #2Okutataragi hydroelectric plant1.9 GW
- #3Okumino hydroelectric plant1.5 GW
Grid connection · within 50 km
- Nearest substation
- 新秩父開閉所
- Its voltage
- 500 kV
- Distance
- 20 km
- Strongest line nearby
- 500 kV
- Line operator
- 東京電力株式会社
- 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
- Kannagawa hydroelectric plant0 m · Power Plant · 1.9 GW · hydro
- Kannagawa hydroelectric plant0 m · Power Plant · 940 MW · hydro
- 神流川線5.7 km · Transmission Line
- 西群馬幹線11 km · Transmission Line
- 安曇幹線2号線15 km · Transmission Line
- 新秩父開閉所20 km · Substation / Converter
On the interactive map
Watercourse: Shinano River, Kanna River
SOURCE: Global Energy Monitor · Global Integrated Power, March 2026 (CC BY 4.0)