GPSS Group combines the expertise of each operating company with five sustainable power sources to realize business development that demonstrates group synergies.


Core business

Sustainable energy development and investment business, Due diligence services for investors, Monitoring service for large IPP

Group employees

185 (as of April 1st, 2020)

GPSS Holdings Inc.

200 million yen


Masaaki Mezaki


GPSS Holdings Inc. Co-Representative Board Director & CEOGPSS Engineering Inc. Board DirectorCIS Japan Business Consulting Inc. Co-Representative Board Director

Masaaki Mezaki

Graduated from the Faculty of Commerce, Keio University. Master of Social Anthropology from the London School of Economics (LSE), University of London, and was an interest rate derivative trader for Merrill Lynch working in Tokyo, New York and London. After leaving Merrill Lynch, travelled to more than 100 countries around the world for nearly 10 years. In 2012, set up Japan Megasolar Inc. to achieve grid parity with photovoltaic power generation. Looking to the development of renewable energy business, changed the company name to GPSS Holdings Inc. in April 2017. Also conducts educational activities for dissemination of renewable energy information through various media.

Books: “Happy Developing Country Nippon” (Aspect) etc. Radio: FM Yokohama (84.7 MHz) “Baile Yokohama” Every Sunday from 21: 30
Radio Japan (1442 kHz) “Mezaki Masaaki’s Happy Wedge” Every Friday from 25: 30
rfc Radio Fukushima (90.8 MHz) Every Tuesday from 9: 15

Sustainable Society Investment Management Inc. (SSIM) Representative Board Director & CEOGPSS Holdings Inc. Co-Representative Board DirectorGeothermal Development & Investment Inc. (GDI) Co-Representative Board DirectorJapan Wind Service Inc. (JWS) Representative Board DirectorJapan Bio Methane Inc. (JBM) Representative Board DirectorJapan Hydro Development Inc. (JHD) Representative Board Director

Takahiro Kurata

Graduated from Physics of Tokyo University of Science, Advanced Management Programme of INSEAD(Fontainebleau) and Renewables of Green Power Academy(London), and was an rates derivative trader(government bonds, interest rate swap and their optionalities as well as inflation linked products) for Merrill Lynch and an fund manager in Merrill Lynch’s Hedge Fund working in Tokyo as well as New York as the head of rates trading for 20 years, and also worked as an advisor of Mr. Eitaro Itoyama(29 years experienced senior Senator and Forbes ranker) and as a board member of Mr. Itoyama’s organization for more than 5 years. After retiring from Bank of America Merrill Lynch, joined and formed GPSS group in order to aim the hike of self-efficient rate of Japan and similar island states by utilizing renewable energy mix(photovoltaic, geothermal, hydro, wind as well as biogas power) and performs as head of business in the group.
•CEO & Representative Director of Geothermal Development & Investment, Inc.(GDI), Grid Parity Financial Solutions, Inc.(GPFS), Japan Hydro-Power Development, Inc.(JHD), CIS Business Consulting, Inc. and Japan Wind Service, Inc.(JWS)
•CEO & Representative of Japan Green Climate Capital, LLC.(JGCC)
•Advisary Board Member of LogicLadder Technologies Private Limited(India)

GPSS Holdings Inc.External Director

Hiroshi Nomiya

Joined Mitsubishi Corporation in 1974 in the Iron Ore Department, after obtaining an MBA from the European Business School (INSEAD) in 1981, joined the Investment Summary, Examination Division of Mitsubishi Corporation. Since 1986 European Mitsubishi Corporation invested in Europe and Africa Strategy planning staff Established MCF Financial Service (London) in 1990 and assumed the position of president Advisory business of acquisitions between Japan and Europe, Merchant · banking investment in Europe, LBO finance etc. Non-dye business In 1994, he returned to Mitsubishi Corporation headquarters and founded an investment company in Asia, promoted private equity investment, promoted advisory work in China and Asia, moved to Ripplewood Holdings (New York) since 1996. In 1999, as a founding member of Nippon Fund’s Japan base set up by Ripplewood, participated in management of RHJ Inn 2005 Appointed over the National Representative Director.
Participated in Crosspoint Advisors, an independent advisory firm, gathered from global investment banks and general trading companies since 2012. He is engaged in advisory business on cross border M & A, business revitalization advice, fund placement support and others.

· Crosspoint Advisors Corporation Representative Director
· Joyful Co., Ltd. Honda Outside Director
· Founding Director of General Association Social Investment Partners
· Director of Music Masters Course of the General Association
· Asian Venture Philanthropy Network (Singapore) Outside Director
· Waseda University Business School part time lecturer (in charge of business revitalization)

GPSS Holdings Inc.External Director

Takeshi Kadota

Takeshi Kadota has been engaged for almost 30 years in various capital market and investment banking activities, including private equity investments and corporate finance services. As Senior Vice President, Division Chief Operating Officer, he managed the Financial Services Division of Mitsubishi Corporation.
Advisor of Financial Products Group Co. and a corporate auditor to Japanese corporations, including The Hachijuni (82) Bank. Former visiting professor and lecturer in the field of business administration at the Interdisciplinary Graduate School of Science and Engineering, Tokyo Institute of Technology.
H. Lawrence Hull, Jr. Leadership Awardee and a lifetime member of Pacific Pension Institute where he was a member of the Board Directors.
B.A. in Law, University of Tokyo, Japan (1971) M.B.A, Stanford University (1981)

· President of Kadota & Co., Inc.
· Representative Director of Institute of Corporate Governance, Japan
· Corporate Auditor of The Hachijuni (82) Bank

GPSS Holdings Inc.External Director

Hikari Imai

Hikari Imai had been involved in the investment banking business for about 30 years including at Morgan Stanley and Merrill Lynch since he joined Yamaichi in 1974. He had served as financial advisors for a lot of major Japanese corporations and financial institutions. He retired from a Vice Chairman of Merrill Lynch Japan in 2005. He has been engaged in the management of industrial corporations including Ebara Foods, Olympus, Pacific Metal, Cyberdyne and 3DOM as outside board directors and others. He also managed Recof as a president which is a boutique M&A advisory firm from 2008 through 2010. He gave lectures about M&A for Executive MBA at Aoyama Gakuin University for 3 years from 2010.
B.A. in Economics, Keio University (1974) MBA, Columbia University (1980)

· Outside Director of PACIFIC METALS CO.,LTD.
· Outside Director of CYBERDYNE, INC.
· Chairman of 3DOM Inc.


Oct 2012

Nihon Mega Solar Maintenance Business established

Mar 2015

Geothermal Development & Investment Inc. established

Sep 2016

Japan Wind-power Service Inc. established

Apr 2017

The company name was changed (Nihon Mega Solar Maintenance Business > GPSS Holdings Inc.)

Dec 2017

GPSS Engineering Inc. established

Dec 2017

Japan Hydro-power Development Inc. established

Oct 2018

Japan Bio Methane Inc. established


Tokyo (Head Office)

Shibakoen ND Bldg. 6F, 2-5-10 Shiba,
Minato-ku, Tokyo 105-0014, Japan



SS Steel Sendaiekimae Bldg. 5-C, 3-6-7 Aoba-ku,
Sendai-shi, Miyagi 980-0021, Japan



Hakata Kindai Bldg. 9F, 1-1-33 Hakataekihigashi,
Hakata-ku, Fukuoka-shi, Fukuoka 812-0013, Japan



8-3-6 Kita 35 Jo Nishi, Kita-ku
Sapporo-shi, Hokkaido 001-0035, Japan



Honmachi Minami Garden City 7F, 3-6-1 Kitakyuhojimachi,
Chuo-Ku, Osaka-shi, Osaka 541-0057, Japan



First-class electric chief engineerʼs examination


Second-class electric chief engineerʼs examination


Third-class electric chief engineerʼs examination


First-class electrical construction management engineer


First-class civil engineering construction management engineer


First-class piping works construction management engineer


First-class building operation and management engineer


Class one electrician


Class two electrician


Class one boiler



Please feel free to ask

© GPSS Holdings Inc.