Shizen International Inc. New Executive Structure

2024.01.26[Press Release]

Shizen International Inc., a subsidiary of Shizen Energy Inc. that promotes the development and operation of renewable energy power plants in Asia, Oceania and Latin America, announces a change in its executive structure effective January 1, 2024.

Since its establishment in 2020, Shizen International has been developing and operating renewable energy power plants, including solar power plants and wind power plants, in 12 countries and regions outside of Japan. With this change in executive structure, the company aims to further strengthen its operational foundation and expand its business.

Change in Executive Structure (effective January 1, 2024)


New position 

Former position

Hiroki Koga

Representative Director

Representative Director  CEO

Oliver Senter


Director CFO

Uli Goeltenbott

Director CTO

Director CTO

Rei Ushikubo


Business Development Director

Ryo Ogawa



Michael Wright


Deputy CFO

【Biographies of Newly Appointed Executives】

Rei Ushikubo
Rei is the CEO of Shizen International leading on all Shizen Energy Group’s international projects. Rei joined Shizen in 2020. She started as the Country Manager in Thailand and established Shizen International (Thailand), leading the corporate PPA business with Aisin Group and Panasonic Group. After returning to Japan, she has been head of project development in Japan including the corporate PPA business and project execution for solar and wind. Prior to joining Shizen Energy Group, she has nine years of experience as an iron ore trader at Mitsubishi Corporation and four years of management experience at Dari K in the cacao and chocolate business. She received her Bachelor of Arts in International Development Studies from University of California, Los Angeles (UCLA). 

Michael Wright
Mike is the CFO of Shizen International and leads on finance matters for international projects with a focus on strengthening governance and information flows to enable better and more timely decisions on strategy, performance and investment. Mike joined Shizen in July 2023 as Deputy CFO for Shizen International.  Prior to joining Shizen, Mike was the Financial Controller for National Grid Ventures and National Grid Partners. He started his finance career at PwC London, working there for over 11 years as an auditor mainly for FTSE100 clients in the energy, utilities and mining sectors. Mike is a UK chartered accountant (FCA, ICAEW) and graduated from the University of Bristol in 2003 with a Masters in Chemistry.

*For the biographies of other executives, please see below.


【About Shizen International Inc.】
Established in September 2020. A subsidiary of Shizen Energy Inc. engaged in the development and asset management of international renewable energy power plants, primarily in Southeast Asia and Brazil.
 ・Headquarters: Fukuoka Ohori Bldg. 1-1-6 Arato, Chuo Ward, Fukuoka City, Fukuoka  
 ・Representative Director: Hiroki Koga