Former Prime Minister Morihiro Hosokawa will pledge in his campaign for the Feb. 9 Tokyo gubernatorial election to set out a road map for Japan to break with nuclear power generation by 2020, according to a close aide.

"By making 2020 his target year, he will change Tokyo and Japan, with the focus on a complete end to nuclear energy," Shusei Tanaka, who was a special adviser to Hosokawa during his 1993-1994 prime ministership, said Friday in an interview.

With Tokyo slated to host the Olympics in 2020, Hosokawa, if elected, will "present (the road map) at the Olympics as an example" to the international community, Tanaka said.