| May 1, 1951 | Established as the Tokyo Electric Power Company with ¥1,460 million in capital |
|---|---|
| November 18, 1953 | Following its founding, commenced operations of Unit No. 3 (55 MW) at Ushioda Thermal Power Station, TEPCO's first thermal power generating facility |
| August 18, 1959 | With the completion of Unit No. 4 at Chiba Thermal Power Station, thermal power output exceeded hydropower output |
| December 10, 1965 | Started operating Unit No. 2 (80 MW) at Yagisawa Power Station, TEPCO's first pumped-storage plant |
| August 8, 1969 | Summer system peak load surpassed that of winter (from winter peak to summer peak) |
| March 26, 1971 | TEPCO's first nuclear power facility, the Fukushima Daiichi Nuclear Power Station's No. 1 reactor (460 MW) began operation |
| April 1, 1980 | Electricity rates rose 52.33%, brought on by the second oil crisis and a sharp increase in fuel costs |
| April 1, 1983 | Established district heating and cooling system at Hikarigaoka in Tokyo |
| April 1984 | Started the "Echo System" to improve our customer responsiveness |
| December 20, 1985 | Began operation of the Futtsu Thermal Power Station, which used TEPCO's first combined cycle generators |
| October 1, 1987 | Launched utility bill collection at convenience stores |
| December 25, 1992 | Released its first Environmental Action Report, which was aimed at addressing environmental issues (Since then, the report has been published annually.) |
| May 15, 1995 | TEPCO's cumulative nuclear power generating output achieved one billion MW |
| March 25, 1996 | Released its "Management Plan Guideline" combining the "Management Efficiency-Enhancement Plan," "Supply Plan," and other plans (to be released annually) |
| January 10, 1997 | Determined the successful bidders to supply power during the three-year period from fiscal 1999, when IPP supply begins (eight companies for 1,100 MW) |
| July 2, 1997 | Initiated operation of Unit No. 7 at Kashiwazaki-Kariwa Nuclear Power Station; All units were completed for a total output of 8.2 million kW, making it one of the world's largest-capacity nuclear power plants |
| November 4, 1997 | TEPCO's Code of Behavior formulated |
| February 10, 1998 | Reduced electricity rates an average of 4.2% |
| March 21, 2000 | Commencement of liberalization of retail sector for high-demand customers |
| March 31, 2000 | Started operations of Hachijojima Windmill Power Station, TEPCO's first windmill power generation facility for commercial use |
| October 1, 2000 | Reduced electricity rates 5.32% |
| October 1, 2000 | Initiated Green Power Fund |
| January 30, 2001 | Established the Mutsu Office in Aomori Prefecture. Location feasibility study commenced (Results announced April 3, 2003) |
| March 29, 2001 | Announced Management Vision |
| July 24, 2001 | Recorded highest system peak load in five years (64.3 million kW) |
| April 1, 2002 | Reduced electricity rates 7.02% |
| March 24, 2003 | TEPCO's Code of Behavior revised Corporate Code of Conduct Based on TEPCO's Corporate Ethics formulated |
| October 1, 2004 | Electricity rates reduced 5.21% |
| October 7, 2004 | Publication of Management Vison 2010, the TEPCO Group's Medium-Term Management Policy |
| April 1, 2005 | Scope of the liberalization of retail power sales extended to all customers who receive high-voltage electricity |
| November 21, 2005 | Established the Recyclable-Fuel Storage Company through a joint venture with The Japan Atomic Power Company (to replace the Mutsu Office) |
| April 1, 2006 | Reduced electricity rates 4.01% |
| June 15, 2007 | Kawasaki Thermal Power Station, Japan's first 1,500oC-class, more advanced combined cycle generator, commenced operations (Unit No. 1 train, axle 3: 500,000 kW) |
| September 13, 2010 | Announced 2020 Vision: TEPCO Group Medium to Long-term Growth Declaration |
| September 29, 2010 | Resolution of capital increase through public offering of stock (Approx. two hundred and fifty million stocks) |
| March 11, 2011 | Occurrence of Tohoku-Chihou-Taiheiyou-Oki Earthquake and Tsunami - Occurrence of incident stipulated in Article 10 of the Act on Special Measures Concerning Nuclear Emergency Preparedness (Station blackout) - Occurrence of incident stipulated in Article 15 of the Act on Special Measures Concerning Nuclear Emergency Preparedness (Loss of emergency core cooling system) |
| March 14-28, 2011 | Rolling blackouts implemented due to the impact of Tohoku-Chihou-Taiheiyou-Oki Earthquake |
| March 15, 2011 | March 15 Establishment of the Government-TEPCO Unified Response Headquarters |
| March 31, 2011 | Establishment of the Fukushima Nuclear Influence Response Division |
| July 1 - September 22, 2011 | Power usage restriction in accordance with Article 27 of the Electricity Business Act |
| October 3, 2011 | Announcement of report by the "Committee of Management and Financial Investigation for TEPCO (established on May 24)" |
| November 4, 2011 | Approval of the "Special Business Plan" |
| December 9, 2011 | Announcement of "Action plans for reform promotion" |
| December 21, 2011 | Announcement of the Mid-and-long Term Roadmap towards the Decommissioning of Units 1-4 of TEPCO Fukushima Daiichi Nuclear Power Station |
| April 1, 2012 | Electricity rate raise in effect for the deregulated sector |
| May 9, 2012 | Approval of the "Comprehensive Special Business Plan" |
| June 20, 2012 | Announcement of the Fukushima Nuclear Accident Investigation Report |
| June 27, 2012 | Transition to a Company with Committees |
| July 31, 2012 | Acceptance of our preferred stock by the Nuclear Damage Liability Facilitation Fund |
| September 1, 2012 | Electricity rate revision for the regulated sector (average of 8.46% increase) |
| November 7, 2012 | Announcement of the "Management Policy towards Restoration" and the "Intensive Reform Implementation Action Plan" |
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