By joining up with Octopus Energy, a fast-growing start-up supplier in home country Britain thanks to its digital technology, Tokyo Gas aims to grab a bigger slice of Japan's electricity market, an official at the Japanese firm said.

Tokyo Gas and Octopus Energy plan to set up the joint venture in Japan in February, and start providing services in autumn 2021.

($1 = 103.4600 yen)

(Reporting by Yuka Obayashi; Editing by Tom Hogue)