44 companies as of January 2021 (alphabetical order)
AGC Inc.
T.Chatani & Co., Ltd.
DAIKIN INDUSTRIES, Ltd.
Deloitte Touche Tohmatsu LLC.
Earth Clean Co.Ltd.
Ernst & Young ShinNihon LLC
EX Research Institute Ltd.
Fuji Electric Co.,Ltd.
Green Power Investment Corporation
Hitachi Zosen Corporation
Hitachi, Ltd.
Hokuriku Electric Power Company
JFE Steel Corporation
JFE Engineering Corporation
Kansai Electric Power Company
Kawasaki Heavy Industries, Ltd.
Kyudenko Corp.
LIXIL Corporation
Mitsubishi Corporation
Mitsubishi Electric Corporation
MITSUBISHI HEAVY INDUSTRIES, LTD.
Mitsubishi UFJ Lease & Finance Co. Ltd.
MITSUI CHEMICALS, INC.
MITSUI E&S Engineering Co., LTD.
Miura Co., Ltd.
Mizuho Bank, Ltd.
NGK INSULATORS, LTD.
Nikken Sekkei Ltd.
Nippon Koei Co., Ltd.
NIPPON STEEL CORPORATION
NIPPON STEEL ENGINEERING CO., LTD.
NIPPON PMAC Co., Ltd.
OSAKA GAS CO., LTD.
SANKEN SETSUBI KOGYO CO., LTD
Sekisui House, Ltd.
Sumitomo Corporation
Sumitomo Electric Corporation
Takasago Thermal Engineering Co., Ltd.
TLV CO., LTD.
Tokyo Electric Power Company Holdings, Incorporated
TOSHIBA Corporation
Toyo Engineering Corporation
Toyota Motor Corporation
Yokogawa Electric Corporation