TEPCO shares were left untraded on a glut of sell orders amid concerns that the government would be nationalizing the company after the Fukushima nuclear plant disaster.
Stock prices on global index fall in the wake of concerns about Japan's economy. Japan's stock prices on the TOPIX index plunge 7.5 percent.
At least a dozen nuclear power plants have shut down across the country and millions of buildings around Tokyo were left without power from the Japan earthquake.
Reports that Toshiba will halt production of its high-definition video format leaves analysts declaring Sony the victor.