Enron Japan Corp., a wholly owned subsidiary of failed U.S. energy giant Enron Corp., said Tuesday it and three other Enron group companies in Japan have filed for bankruptcy.

The move by Enron Japan, Enron Japan Marketing Corp., Enron Japan Funding Corp. and E Power Corp. followed the failure of the U.S. parent, which together with 13 affiliated entities filed for court protection from creditors Dec. 2 in one of the biggest bankruptcies in U.S. corporate history.

Enron's group liabilities were estimated at $31 billion against assets of $50 billion as of Dec. 2.

In Japan, the Houston-based company had been involved in projects to build four power plants.

They included a liquefied natural gas thermal electricity plant in the village of Rokkasho in Aomori Prefecture, a coal-powered thermal power plant in Matsuyama, Ehime Prefecture, and coal-powered generation plants in Ube, Yamaguchi Prefecture, and in Omuta, Fukuoka Prefecture.