Power grid main characteristics
Power network facilities are essential to conveying the electricity generated at power plants to customers. TEPCO strives to provide a stable supply using a system that is integrated from the power generation stage to final distribution.
TEPCO’s power grid is composed of about 40,000 kilometers of transmission lines. In the event of a malfunction along one route, the multiplex design of this system allows power to be transmitted over an alternate route. In addition, a wide-area flexible network has been established, using shared transmission lines to link power companies nationwide. This network provides increased stability and keeps costs down by allowing electric power companies to supply power to each other.
TEPCO had over 1,500 transformer substations, which control voltage and stabilize current to facilitate the efficient transmission of power from the power plant to the consumer with a minimum of loss.
For more information, please refer: http://www.tepco.co.jp/en/challenge/energy/net-e.html
For more detailed data, Facts & Figures are: http://www.tepco.co.jp/en/corpinfo/overview/facts-e.html
Major incidents & preventive measures
The Great East Japan Earthquake
At 2:46PM on March 11, 2011, a magnitude 9.0 earthquake occurred with the epicenter in the east of Sanriku coast in the Tohoku region of Japan. This earthquake called as the Great East Japan Earthquake caused massive damage to TEPCO’s facilities and precipitated a number of serious accidents at Fukushima Daiichi Nuclear Power Station. Consequently, TEPCO has been confronting an unprecedented major crisis that results in power shortages and rolling blackouts on 10 days between March 14 and March 28.
For more information, please refer: http://www.tepco.co.jp/en/torikumi/thermal/index-e.html
Regarding the accident at Fukushima Daiichi Nuclear Power Station, TEPCO deeply apologize to the people of Fukushima and broader society for the tremendous inconvenience and anxiety caused by the accident. TEPCO is committed to fulfilling its social mission, that is, offering stable power supply, with continuously making all-out efforts to bring about an end to the emergency situation at the nuclear power station and to secure power supply facilities.
For various measures after the accident, please refer: http://www.tepco.co.jp/en/restoration/index-e.html and http://www.tepco.co.jp/en/kaikaku/index-e.html