J-Power will win support for its business strategies and a plan to reappoint all 13 board members at its shareholders' meeting Thursday despite opposition from its biggest stakeholder, The Children's Investment Fund, the head of the power firm said.

"I am fully confident," Yoshihiko Nakagaki, president of the major electricity wholesaler whose official name is Electric Power Development Co., said in a recent interview.

J-Power and TCI have been in a proxy fight over a series of proposals by the British hedge fund, including a dividend hike, a reduction in cross-shareholdings and hiring at least three outside directors.