Tokyo Electric Power Company (TEPCO)
Owner-operator of the Fukushima Daiichi nuclear plant examined in the investigation.
PIA Investigations Covering This Organisation
Tokyo Electric Power Company (TEPCO) appears in 1 Project Insider Asia investigation, covering Billion Dollar Failures.
The Evidence Record
What the investigations document about Tokyo Electric Power Company (TEPCO)'s involvement, drawn from the published investigation records.
Fukushima Daiichi
| Investigation focus | A Manmade Disaster: How Japan's Nuclear Establishment Designed Out the Warning Signs |
|---|---|
| Cost | ¥21.5tn (US$187–190bn) official 2016 estimate; JCER private estimate ¥35–81tn; ¥12.1tn spent by FY2021 (Board of Audit) |
| Country | Japan |
| Industry | Nuclear Energy |
| Key dates | 2026-08-17 |
Governance Lessons
Lessons from the investigations covering Tokyo Electric Power Company (TEPCO), each attributed to its source investigation.
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Regulatory Capture Is a Design Flaw, Not a Scandal
NISA sat inside METI, the ministry promoting nuclear power, and rotated staff with the industry. NAIIC named the resulting capture as a root cause. Safety regulators of hazardous assets need structural independence — budget, appointments and statutory powers — not just good intentions.
From Fukushima Daiichi
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Internal Warnings Must Have a Forcing Function
TEPCO's 2008 tsunami analysis reached its executives and died there. Safety-significant internal analysis should carry a mandatory disposition process: regulator notification, independent review, and a documented accept-or-mitigate decision at board level, within a fixed period.
From Fukushima Daiichi
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Postponement Is a Decision With a Price
Countermeasures were considered in 2008 and deferred pending further study; a Tokyo court in 2022 priced that deferral at ¥13.32 trillion in executive liability. 'More analysis' is not a neutral option when the hazard is time-invariant and the exposure is catastrophic.
From Fukushima Daiichi
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Design Basis Must Track the Science
The plant's 5.7-metre tsunami basis survived unchanged through a decade of new palaeotsunami science (the 869 Jogan event evidence, the 2002 government long-term assessment). Design bases for long-lived assets need scheduled re-validation against current hazard science, with upgrade triggers.
From Fukushima Daiichi
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Single-Point Failures Cluster in Basements
Emergency power and seawater pumps — the last line of defence — were placed in low-lying areas vulnerable to the exact hazard under analysis. Defence-in-depth reviews must walk the physical layout against the hazard scenario, not the org chart.
From Fukushima Daiichi
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Evacuation Harm Is Project Harm
More than 2,000 disaster-related deaths in Fukushima Prefecture are attributed to evacuation and displacement stress, against a single officially recognised radiation death. Emergency planning is part of the project's safety case, and its human costs belong in the risk model.
From Fukushima Daiichi
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Estimate the Tail Before You Build the Head
Official cleanup cost estimates nearly doubled in five years (¥11tn to ¥21.5tn) and private estimates run to ¥81tn, with fuel-debris removal decades behind early plans. Whole-life liability pricing, including accident externality, should be part of any hazardous-asset investment case.
From Fukushima Daiichi
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