Tokyo Electric Power Company (TEPCO) is Japan's largest electric utility, founded in 1951. Its history includes major nuclear power development, the Fukushima Daiichi nuclear disaster in 2011, subsequent bailouts, restructuring, and ongoing decommissioning efforts.
Tokyo Electric Power Co. was established on May 1, 1951, as a result of the post-World War II reorganization of Japan's electric power industry. It was granted a monopoly over the Tokyo region. #energy #japan
TEPCO completed its first thermal power plant, the Chiba Thermal Power Station, marking the start of large-scale fossil fuel generation. #energy #thermal
TEPCO began planning for nuclear power, forming a nuclear power division. This led to the construction of the Tokai Nuclear Power Plant (joint venture with other utilities). #nuclear #energy
Construction began on the Fukushima Daiichi Nuclear Power Plant, which would become the site of the 2011 disaster. The first unit started commercial operation in 1971. #nuclear #construction
Unit 1 of Fukushima Daiichi began commercial operation, the first boiling water reactor in Japan built by TEPCO. #nuclear #energy
Fukushima Daiichi Unit 2 began commercial operation, increasing TEPCO's nuclear capacity. #nuclear #energy
Unit 3 of Fukushima Daiichi started commercial operation, using both uranium and mixed oxide (MOX) fuel. #nuclear #energy
Unit 4 at Fukushima Daiichi began commercial operation, though it was later shut down and at the time of the 2011 disaster it was undergoing maintenance. #nuclear #energy
TEPCO started construction of the Kashiwazaki-Kariwa Nuclear Power Plant, which would become the world's largest nuclear plant by capacity. #nuclear #energy
Unit 1 of Kashiwazaki-Kariwa began commercial operation, with additional units coming online through the 1990s. #nuclear #energy
TEPCO's market capitalization and revenues made it the largest privately owned electric utility in the world at the time. #corporate #energy
TEPCO admitted to falsifying safety inspection data at several nuclear plants, leading to a major scandal and loss of public trust. #scandal #nuclear
A magnitude 6.6 earthquake struck near the Kashiwazaki-Kariwa plant, causing fires and radioactive releases. TEPCO faced criticism for inadequate earthquake preparedness. #earthquake #nuclear
After the 2007 earthquake and scandal, TEPCO announced a restructuring plan including safety improvements and management changes. #restructuring #safety
A massive earthquake and tsunami struck Japan, causing a loss of power and cooling at Fukushima Daiichi, leading to meltdowns in Units 1-3, hydrogen explosions, and widespread radioactive contamination. #nucleardisaster #fukushima
The Japanese government established the Nuclear Damage Compensation and Decommissioning Facilitation Corporation (NDF) and injected public funds, effectively nationalizing TEPCO. #bailout #government
TEPCO announced that the Fukushima reactors had reached cold shutdown, bringing them under control. #fukushima #coldshutdown
TEPCO president Toshio Nishizawa resigned following public and government pressure over the company's handling of the disaster. #resignation #leadership
Former TEPCO executives were indicted on professional negligence charges related to the Fukushima disaster, though later acquitted. #legal #justice
TEPCO reported a net loss of over 1 trillion yen (about $9.7 billion) for fiscal 2013, the largest loss in Japanese corporate history at the time. #financial #loss
TEPCO transitioned to a holding company structure, with subsidiaries for power generation, transmission, and retail, to comply with Japan's electricity market deregulation. #restructuring #deregulation
Japan's electricity retail market fully opened to competition, ending TEPCO's monopoly in its service area. #deregulation #energy
TEPCO completed a frozen soil barrier (ice wall) around the Fukushima reactors to prevent groundwater from entering the contaminated buildings. #engineering #fukushima
TEPCO sold a portion of its stake in JERA, a joint venture with Chubu Electric, to raise funds for decommissioning costs. #finance #decommissioning
Japan's government and TEPCO revised the decommissioning roadmap for Fukushima Daiichi, extending the timeline to 2051 for complete removal of debris. #decommissioning #nuclear
TEPCO faced growing concerns over storage of treated radioactive water at Fukushima; the government later announced plans for ocean release in 2021. #environment #water
The Japanese government approved a plan to release over 1 million tons of treated radioactive water from Fukushima into the Pacific Ocean over 30 years, starting in 2023. #controversy #environment
Regulators ordered TEPCO to keep the Kashiwazaki-Kariwa plant offline due to unresolved safety issues and anti-terrorism measures. #safety #nuclear
TEPCO began the release of treated radioactive water from Fukushima into the Pacific Ocean, a decision met with domestic and international criticism. #environment #fukushima
TEPCO reported its first net profit in years due to cost-cutting and higher electricity rates, though decommissioning costs remain a heavy burden. #financial #recovery
TEPCO started the challenging process of removing melted nuclear fuel debris from Unit 2 at Fukushima Daiichi, a key step in decommissioning. #decommissioning #nuclear