Power mix by fuel (Japan)
Plant counts by primary fuel, WRI Global Power Plant Database (CC BY 4.0).
Japan electricity grid — mix & carbon intensity (2025)
Source: Ember / Our World in Data (CC BY 4.0).
The state of Japan’s power emissions
Across the 125 Japan power plants carrying an asset-level CO₂ figure in this open dataset, total emissions are about 246 Mt CO₂/yr. The single largest emitter, Kobe power station (coal), accounts for about 6% of that 125-plant reported subset (not of the whole country). The top three owners — J-POWER, Tohoku Electric Power Co, Kobelco Power Kobe Inc. — control roughly 32% of that 125-plant reported subset. Most of these plants sit in a temperate Köppen climate zone.
Largest emitters (Mt CO₂/yr)
Emissions by owner (Mt CO₂/yr)
CO₂ — measured (US EPA / EU ETS) or modelled (Climate TRACE), per plant · backbone WRI Global Power Plant Database (CC BY 4.0) · climate: Köppen-Geiger (WorldClim). CC BY 4.0.
Largest plants in Japan
| # | Plant | Fuel | MW |
|---|---|---|---|
| 1 | Futtsu | Gas | 5,334 |
| 2 | Higashi Niigata | Gas | 4,810 |
| 3 | Kawagoe | Gas | 4,802 |
| 4 | Ohi | Nuclear | 4,710 |
| 5 | Fukushima Daina | Nuclear | 4,400 |
| 6 | Hirono | Oil | 4,400 |
| 7 | Kashima | Oil | 4,400 |
| 8 | Hekinan power station | Coal | 4,100 |
| 9 | Chita | Oil | 3,966 |
| 10 | Sodegaura | Gas | 3,600 |
| 11 | Genkai | Nuclear | 3,478 |
| 12 | Takahama | Nuclear | 3,392 |
| 13 | Anegasaki | Oil | 3,150 |
| 14 | Shin Nagoya | Gas | 3,058 |
| 15 | Yokohama | Oil | 3,016 |
| 16 | Himeji Daini | Gas | 2,919 |
| 17 | Chiba | Gas | 2,880 |
| 18 | Shin Oita | Gas | 2,295 |
| 19 | Yokosuka | Oil | 2,274 |
| 20 | Onagawa | Nuclear | 2,174 |
Power plants in Japan by region
Cite this
Inzonex PowerAtlas (2026). Asset-level power-plant CO2 emissions — Japan. Derived from WRI GPPD, Climate TRACE, US EPA GHGRP and EU ETS (CC BY 4.0). https://inzonex.co.uk/poweratlas/japan/
Frequently asked questions
How many power plants are in Japan?
There are 670 current or operating power-plant records in Japan in this open dataset, with about 235,559 MW of capacity. Historical and pipeline records remain available separately.
What is the largest power plant in Japan?
Futtsu is the largest at about 5,334 MW (gas).
What fuels generate electricity in Japan?
The most common plant type in this dataset is solar (324 plants), across 11 fuel types in total.
How clean is Japan's electricity grid?
Japan's grid carbon intensity is about 477 gCO₂/kWh, with 32.7% low-carbon generation (<a href="https://ember-energy.org/" rel="nofollow">Ember</a> / <a href="https://ourworldindata.org/energy" rel="nofollow">Our World in Data</a> (CC BY 4.0)).