Central Tokyo office tower wins race to 100% green energy

TOKYO -- An office building adjacent to Tokyo Station will run entirely on renewable energy starting in January, becoming the first high-rise in the Marunouchi central business district to make the full switch amid Japan's push to cut its carbon footprint.

Tekko Building will use electricity generated at biomass plants run by its power supplier, Eneos Corp., a unit of Eneos Holdings. Eneos operates biomass facilities in cities such as Kawasaki, near Tokyo, and Muroran in the northernmost prefecture of Hokkaido.