Tokyo Electric Power Company
E223647
Tokyo Electric Power Company is Japan’s largest electric utility, internationally known for operating the Fukushima Daiichi nuclear plant involved in the 2011 nuclear disaster.
All labels observed (9)
How this entity was disambiguated
This entity first appeared as the object of triple T1979338 — resolving that mention is where its identity was fixed. The disambiguator weighed these candidate entities and picked the highlighted one (or “None”, minting a new entity). This is how homonymy is resolved: the same surface form can point to different entities.
NED1
Entity disambiguation (via context triple)
gpt-5-mini-2025-08-07
Target entity: Tokyo Electric Power Company Context triple: [Fukushima Daiichi nuclear disaster, operator, Tokyo Electric Power Company]
-
A.
Nippon Electric Company
Nippon Electric Company, now known as NEC Corporation, is a major Japanese multinational provider of information technology and electronics solutions.
-
B.
Tokyu Corporation
Tokyu Corporation is a major Japanese private railway and real estate company based in Tokyo, known for operating extensive rail networks and developing commercial and residential areas, particularly around Shibuya.
-
C.
Engie
Engie is a major French multinational utility company specializing in electricity, natural gas, and energy services, with a strong focus on renewable and low-carbon energy solutions.
-
D.
Keio Corporation
Keio Corporation is a major Japanese private railway and transportation company operating rail lines and related services in the Tokyo metropolitan area.
-
E.
Tokyo Tower Co., Ltd.
Tokyo Tower Co., Ltd. is the company responsible for operating and maintaining Tokyo Tower, one of Japan’s most iconic landmarks and tourist attractions.
- F. None of above. chosen
- G. Unsure - the case is ambiguous/there is not enough information to decide.
NED2
Entity disambiguation (via description)
gpt-5-mini-2025-08-07
Target entity: Tokyo Electric Power Company Target entity description: Tokyo Electric Power Company is Japan’s largest electric utility, internationally known for operating the Fukushima Daiichi nuclear plant involved in the 2011 nuclear disaster.
-
A.
Nippon Electric Company
Nippon Electric Company, now known as NEC Corporation, is a major Japanese multinational provider of information technology and electronics solutions.
-
B.
Tokyu Corporation
Tokyu Corporation is a major Japanese private railway and real estate company based in Tokyo, known for operating extensive rail networks and developing commercial and residential areas, particularly around Shibuya.
-
C.
Engie
Engie is a major French multinational utility company specializing in electricity, natural gas, and energy services, with a strong focus on renewable and low-carbon energy solutions.
-
D.
Keio Corporation
Keio Corporation is a major Japanese private railway and transportation company operating rail lines and related services in the Tokyo metropolitan area.
-
E.
Tokyo Tower Co., Ltd.
Tokyo Tower Co., Ltd. is the company responsible for operating and maintaining Tokyo Tower, one of Japan’s most iconic landmarks and tourist attractions.
- F. None of above. chosen
Statements (50)
| Predicate | Object |
|---|---|
| instanceOf |
electric utility company
ⓘ
public company ⓘ |
| alsoKnownAs |
Tokyo Electric Power Company
ⓘ
surface form:
TEPCO
Tokyo Electric Power Company ⓘ
surface form:
Tokyo Electric Power Company Holdings, Incorporated
|
| businessModel | vertically integrated electric utility ⓘ |
| country | Japan ⓘ |
| foundedBy | Japanese government-related interests ⓘ |
| hasHeadOfGovernment | president and CEO ⓘ |
| headquartersLocation |
Chiyoda, Tokyo
ⓘ
Tokyo ⓘ |
| inception | 1951 ⓘ |
| industry |
electric power industry
ⓘ
energy ⓘ nuclear power industry ⓘ |
| knownFor | Fukushima Daiichi nuclear disaster ⓘ |
| languageOfWorkOrName | Japanese ⓘ |
| legalForm | kabushiki gaisha ⓘ |
| locatedInTimeZone | Japan Standard Time ⓘ |
| nativeLabel |
Tokyo Electric Power Company
self-linksurface differs
ⓘ
surface form:
東京電力ホールディングス株式会社
|
| numberOfEmployees | over 30,000 ⓘ |
| operates |
Fukushima Daiichi Nuclear Power Plant
ⓘ
Fukushima Daini Nuclear Power Plant ⓘ Kashiwazaki-Kariwa Nuclear Power Plant ⓘ distribution networks ⓘ hydroelectric power plants ⓘ thermal power plants ⓘ transmission networks ⓘ |
| parentOrganization |
Tokyo Electric Power Company
self-linksurface differs
ⓘ
surface form:
Tokyo Electric Power Company Holdings, Incorporated
|
| product |
electricity
ⓘ
power distribution services ⓘ power generation services ⓘ power transmission services ⓘ |
| rank | largest electric utility in Japan by electricity sales ⓘ |
| regulator |
Agency for Natural Resources and Energy (Japan)
ⓘ
Nuclear Regulation Authority (Japan) ⓘ
surface form:
Nuclear Regulation Authority of Japan
|
| reorganizedAs | holding company structure in 2016 ⓘ |
| serviceArea |
Kantō region
ⓘ
Tokyo metropolitan area ⓘ Yamanashi Prefecture NERFINISHED ⓘ Shizuoka Prefecture ⓘ
surface form:
eastern Shizuoka Prefecture
|
| sharesOutstanding | listed on First Section of Tokyo Stock Exchange before reorganization ⓘ |
| shortName |
Tokyo Electric Power Company
self-linksurface differs
ⓘ
surface form:
TEPCO Holdings
|
| significantEvent |
2011 Fukushima Daiichi nuclear accident
ⓘ
2011 Tōhoku earthquake and tsunami ⓘ |
| stockExchange | Tokyo Stock Exchange ⓘ |
| subsidiary |
Tokyo Electric Power Company
self-linksurface differs
ⓘ
surface form:
TEPCO Energy Partner, Inc.
Tokyo Electric Power Company self-linksurface differs ⓘ
surface form:
TEPCO Fuel & Power, Inc.
Tokyo Electric Power Company self-linksurface differs ⓘ
surface form:
TEPCO Power Grid, Inc.
|
| tickerSymbol | 9501 ⓘ |
| website | https://www.tepco.co.jp ⓘ |
How these facts were elicited
The pipeline generated the facts above by prompting gpt-5.1 with this entity's name + description and the instruction below.
Instruction
You are a knowledge base construction expert. Given a subject entity and a description of it, return factual statements that you know for the subject as a JSON list of dictionaries(triples), where keys must be "subject", "predicate" and "object". The number of facts may be very high, between 25 to 50 or more, for very popular subjects. For less popular subjects, the number of facts can be very low, like 5 or 10. # Requirements - If you don't know the subject at all, return an empty list. - If the subject is not a named entity, return an empty list. - Include at least one triple where predicate is "instanceOf". - Do not get too wordy. - Separate several objects into multiple triples with one object.
Input
Subject: Tokyo Electric Power Company Description of subject: Tokyo Electric Power Company is Japan’s largest electric utility, internationally known for operating the Fukushima Daiichi nuclear plant involved in the 2011 nuclear disaster.
Referenced by (22)
Full triples — surface form annotated when it differs from this entity's canonical label.
this entity surface form:
TEPCO
subject surface form:
Kashiwazaki
this entity surface form:
TEPCO
this entity surface form:
Tokyo Electric Power Company Holdings, Inc.
this entity surface form:
TEPCO
this entity surface form:
Tokyo Electric Power Company Holdings, Incorporated
this entity surface form:
TEPCO Holdings
Tokyo Electric Power Company
→
nativeLabel
→
Tokyo Electric Power Company
self-linksurface differs
ⓘ
this entity surface form:
東京電力ホールディングス株式会社
Tokyo Electric Power Company
→
parentOrganization
→
Tokyo Electric Power Company
self-linksurface differs
ⓘ
this entity surface form:
Tokyo Electric Power Company Holdings, Incorporated
this entity surface form:
TEPCO Power Grid, Inc.
this entity surface form:
TEPCO Fuel & Power, Inc.
this entity surface form:
TEPCO Energy Partner, Inc.
this entity surface form:
TEPCO
this entity surface form:
TEPCO