Tokyo Electric Power Co.

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Tokyo Electric Power Co. President Toshio Nishizawa, right, looks up as Japan's Nuclear Crisis Minister Goshi Hosono, left, speaks during a press conference at the headquarters of TEPCO, the operator of the tsunami-damaged Fukushima Dai-ichi nuclear power plant, in Tokyo Friday, Dec. 16, 2011, shortly after Japan's prime minister announced that the nuclear plant has achieved a stable state of "cold shutdown," a crucial step toward the eventual lifting of evacuation orders and closing of the plant. (AP Photo/Hiro Komae)

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** FILE ** In this May 31, 2011, photo released Saturday, June 4, 2011, by Tokyo Electric Power Co. (TEPCO), a worker climbs scaffoldings set up around the decontamination device, having functions of nuclide adsorption and coagulation settling in the newly built radioactive water processing facilities at Fukushima Dai-ichi nuclear power plant in Okuma, Fukushima prefecture, northeastern Japan. (AP Photo/Tokyo Electric Power Co.)

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Tokyo Electric Power Co. President Masataka Shimizu arrives for a news conference at company headquarters in Tokyo on Friday to announce that he is stepping down. (Associated Press)

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This April 10 image taken by T-Hawk drone aircraft and released by Tokyo Electric Power Co., shows the damaged reactor building of Unit 1 of the tsunami-crippled Fukushima Dai-ichi nuclear power plant in Okuma, Fukushima Prefecture, northeastern Japan. Japan's nuclear safety agency said workers entered the reactor building of Unit 1 at the nuclear complex for the first time Thursday after the March 11 earthquake. (Associated Press/Tokyo Electric Power Co.)

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Tokyo Electric Power Co. plans to end the crisis at its tsunami-damaged Fukushima Dai-Ichi power plant, the worst nuclear disaster since Chernobyl, within six months. This is the operation floor in the reactor building of Unit 4 at the nuclear power plant in Fukushima prefecture. (Bloomberg)

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Angry residents forced from their homes near Japan's tsunami-stricken Fukushima Dai-ichi nuclear power plant take a seat as they meet officials of Tokyo Electric Power Co., the plant's operator, at its headquarters in Tokyo Wednesday, April 13, 2011. (AP Photo/Yuri Kageyama)

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In this March 11, 2011, photo released on Monday, April 11, 2011, by Tokyo Electric Power Co. (Tepco), the access road at the Fukushima Dai-ichi nuclear power plant is flooded as a tsunami hits the facility following a massive earthquake in Okuma town, Fukushima Prefecture, northeastern Japan. (AP Photo/Tokyo Electric Power Co.)

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Highly radioactive water leaks through a crack in a maintenance pit (right) into the sea near the Unit 2 reactor of the Fukushima Dai-ichi nuclear power plant in Okumamachi, Fukushima Prefecture, Japan, in a photo released by the Tokyo Electric Power Co., the operator of the facility, on Saturday, April 2, 2011. (AP Photo/Tokyo Electric Power Co. via Kyodo News)

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In this Friday, April 1, 2011, photo released by Tokyo Electric Power Co., workers for the company experimentally spray adhesive synthetic resin over the ground at the Fukushima Dai-ichi nuclear power plant in Okumamachi, northeastern Japan. TEPCO expects the resin spraying to prevent dust exposed to radiation materials from spreading out of the premises. (AP Photo/Tokyo Electric Power Co.)

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The headquarters building of the Tokyo Electric Power Co., also known as Tepco, at the base of the communications tower in the middle, is pictured in Tokyo on Monday, March 28, 2011. The company, which runs the Fukushima Dai-ichi nuclear power plant at the center of the country's nuclear crisis, has issued a series of botched radiation readings from the plant in recent days. (AP Photo/Greg Baker)

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In this photo released by Tokyo Electric Power Co. (Tepco), gray smoke rises from Unit 3 of the tsunami-stricken Fukushima Dai-ichi nuclear power plant in Okumamachi, Fukushima Prefecture, Japan, on Monday, March 21, 2011. (AP Photo/Tokyo Electric Power Co.)

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In this photo released by Tokyo Electric Power Co. (TEPCO), gray smoke rises from Unit 3 of the tsunami-stricken Fukushima Dai-ichi nuclear power plant in Okumamachi, Fukushima Prefecture, Japan, on Monday, March 21, 2011. Officials said that TEPCO temporarily evacuated its workers from the site. At left is Unit 2 and at right is Unit 4. (AP Photo/Tokyo Electric Power Co.)