The voice of Atsutoshi Nishida, president of Toshiba Corp., rose an octave as he talked about the electronic giant's quest to build atomic power plants.

"Our plan calls for us to either sign or start constructing 33 nuclear power plants by 2015," Nishida said in May. "The figures are conservative, however."

Atomic plant construction has become a key strategy at Toshiba, which purchased U.S. reactor builder Westinghouse Electric Co. in 2006 for $5.4 billion.