On the first anniversary of the start of the nuclear crisis, Tokyo Electric Power Co. President Toshio Nishizawa once again offered an apology and vowed every effort to keep the Fukushima No. 1 plant stable and "appropriately" compensate those affected by the accident.

"Because of the accident at our Fukushima No. 1 plant, we have caused trouble, pain and concern to residents around the plant, people in Fukushima Prefecture and all the other people in society," Nishizawa said Sunday.

He and Tepco employees observed a moment of silence at 2:46 p.m., the time the killer earthquake struck off Miyagi Prefecture a year ago and set off the events triggering the crisis.