Meet our CEO and Senior Management

Prapharat Tangkawattana

Chief Executive Officer


Prapharat has more than 20 years of Thai and international working experience in financial institutions, hospitality, coal mining and the solar power business. From 1990 to 2005, Prapharat developed her career as a research analyst focusing on utilities and hotel businesses. She worked with HSBC Securities, BNP Paribas Securities and United Securities PLC. Her experiences developed further in the corporate sector at Banpu PLC and Minor International PLC where she was a senior finance director for nearly 10 years. Prapharat was a member of the Board of Directors for BBL Assets Management from 1997-1998, and LionPort Capital Pte. of Singapore in 2012.

In 2010, Prapharat joined Thai Solar Energy PLC as a CFO, when Thailand started implementing solar power under the government subsidized Power Purchase Agreement (PPA) scheme. In June 2014, she became the CFO of Impact Electrons Siam where she successfully increased the company’s capital from THB 4m to THB 1,245m in early 2015. She is the founder of Nortis Group of Companies and became the Group CEO later in 2015.
Prapharat graduated from Chulalongkorn University with a Bachelor of Economics in 1989. She completed her MBA at Franklin University in Columbus, Ohio in the United States of America in 1993.

We believe a small improvement with continued efforts could change the world, and we hope anyone can be a part of it.

Jesada Sophonpanich Yangpichit

Executive Director


Jesada has gained over 15 years of experience in various industries. He started out in human resources consulting at Ernst & Young. Then he moved into CRM and Sales & Marketing with Virgin Radio and RS Promotions PLC. In 2007, Jesada became partner of Keypoint Recruitment Co., Ltd., a subsidiary of Ernst & Young.

Since 2011, he has been part of a new venture which involves the manufacturing of flexible packaging. The company, Plastissimo Film, is now the leader in the production of multi-layer film in South East Asia, supplying it to countries including Thailand, Indonesia and Australia. Clients include PepsiCo, CPF and Betagro. Jesada’s experience and interests in industries ranging from publishing and human resources to finance and manufacturing, allow him to understand the needs of a new business well.

Before you are a leader, success is all about growing yourself. When you become a leader, success is all about helping others grow.

Onuma Sisangthong

SVP Corporate Finance and Business Development


Onuma obtained a Bachelor of Business Administration from the Faculty of Commerce with Honors from Thammasat University in 2009. Right after graduation, she started her career as a Project Analyst for the Natural Energy Development Company Limited (“NED”). NED was jointly owned by Mitsubishi Group, China Lights Power (HK) and Electricity Generating PLC. It was one of the first mega solar projects in Thailand and the largest of its kind in South East Asia, with a combined capacity 84 MW when it started operating.

When NED was dissolved in 2012, Onuma moved on to develop solar and wind power projects overseas with the newly formed Impact Electrons Siam Co., Ltd. (IES). She held several important roles in Japan, and handled project development, financing and commercial management. Her most recent success was when she secured financing for a 2.5 MW solar rooftop project that sold energy to the Metropolitan Electricity Authority in 2015. Later that year, Onuma decided to join Nortis Group as one of the key founding partners.

Leadership is lifting a person’s vision to high sights, raising a person’s performance to a higher standard, building a personality beyond its normal limitations.

Sarawut Thamawai

VP Engineering


Sarawut has over 15 years of experience working for oil & gas, renewable and especially solar projects throughout Thailand. During his career, he has developed over 100MW solar power plants and rooftop projects from greenfield to development, operation and management. His most recent assignment over the past five years was with Thai Solar Energy PLC. He contributed to the development of a 5MW DSG solar thermal power plant, 80MWac PV solar plants and 14MWdc rooftop projects.

His other roles included pre-engineering functions along with cost budgeting, project feasibility, preparation of engineering and management reports for solar projects.

Sarawut graduated with a Bachelor’s Degree in Civil Engineering from Mahanakorn University of Technology in 2003. In 2016 he joined Nortis Group as Vice President–Engineering.

Never doubt that a small group of thoughtful, concerned citizens can change the world. Indeed, it is the only thing that ever has.

Zuph Sumpanchaivasu

Head of Engineering Team – Nortis Group
Managing Director – Sitron Power Co., Ltd.


With extensive experience in engineering work for power plant. Zuph has started from Bangkok Industrial Gas Co., Ltd for plant engineering and sales manager of water treatment and related system. Started his passion in renewable energy since joined Thai Solar Energy PLC. in 2009, his role and responsibility in Solar Thermal Power Plant has led his expertise stronger with diversity from project feasibility, project management, project construction. Later founded EPP International Company Limited (“EPP”) with team of engineer to be the expert in engineering services for construction of power plant with core competent in solar energy sector.

His roles in EPP include business development, project initiation, technical and financial feasibility and project management. In 2017, after several contracts awarded by NORTIS, Zuph decided to join NORTIS’s subsidiary, Sitron Power which is the EPC company under Nortis Group.

He graduated with honor in Mater of Engineering from King Mongkut’s University of Technology Thonburi with scholarship from Thai Oil PLC. and Bachelor degrees in Bachelor of Engineering, Chemical Engineering from Kasetsart University.

Success never came from comfort zones.

Only Best Leaders are not enough...

What make us success is the strong team working together like a family.