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Japan — Energy Infrastructure

OverWatts maps 692 energy assets in Japan across 15 layers — the 12th-largest mapped base of 157 countries. They include 387 power plants, 93 pipelines and 57 LNG terminals. Operating generation capacity is 199 GW, led by gas at 45%. Refining capacity is about 2,082 kb/d.

The companies named on the most assets are JERA Co Inc (46), Kansai Electric Power Co (40) and Tokyo Gas (36), counting both ownership and operatorship. Half of Japan's mapped assets in service predate 1989 (median commissioning year of the 481 with a known date), 55 came online in the past decade and the oldest still listed is Nippon Kyushu Works (Yawata Area, Tobata) steel plant, dating from 1901. 40+ projects are under construction or proposed, led by SSE Pacifico Prospective Japanese Projects wind farm (4.1 GW).

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692
Total assets
#12
of 157 countries
199 GW
operating · 387 power plants
2,082
Refining kb/d
437
LNG Mtpa
40
In construction / proposed

Operating generation capacity by fuel

Utility-scale sites of 100 MW and above. Distributed generation — rooftop solar especially — is outside the tracker, so this runs below national installed capacity.

Electricity generated by fuel · 2025

What the fleet actually produced — distinct from the installed capacity above.

Total 1.03 PWhDemand 1.03 PWhClean 33%Intensity 477 gCO₂/kWh

Ember · source · CC-BY-4.0

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Browse by asset class

Power grid 18,800 kmPower Plants 387Pipelines 93LNG Terminals 57Iron & Steel Plants 42Grid Storage 35Cement Plants 31Chemical Plants 17Refineries 10Export Terminals 8Interconnectors 6Data Centres 2Contracts 1Storage / Tank Farms 1Oil & Gas Fields 1Coal & Uranium Mines 1

Under construction & proposed

Largest assets

Biggest owners & operators

Counts an asset once per company named as its owner or operator; a joint venture counts for each partner.

Frequently asked

How many energy assets does Japan have?
OverWatts maps 692 in Japan across 15 asset classes — the 12th-largest mapped base of the 157 countries covered.
How much electricity generation capacity does Japan have?
About 199 GW operating across 248 plants, mostly gas 45%, coal 26% and hydro 16%.
Who owns Japan's energy infrastructure?
JERA Co Inc is named as owner or operator on the most mapped assets (46), followed by Kansai Electric Power Co (40), Tokyo Gas (36) and Tokyo Electric Power Company Holdings INC (TEPCO) (23).
What energy projects are under construction in Japan?
The largest under way or proposed are SSE Pacifico Prospective Japanese Projects wind farm (4.1 GW), Ishikari Bay offshore wind farm (3.0 GW) and Kashiwazaki Kariwa nuclear power plant (2.7 GW).