Stefan Riel 

President / Managing Partner APAC

80 Raffles Place

#33-00 UOB Plaza

Singapore 048624

phone: +60 123 500 625


"I like the challenge of the different cultures and the opportunities for new business areas for the Greencells Group."

Stefan Riel, also based in Kuala Lumpur, is responsible for sales and business development in Asia. Part of the Greencells Group since 2013, Stefan continues to leverage his extensive connections in the solar industry and his long-standing relationships with project developers in regions emerging markets. Stefan has a long track record in sustainable energy, co-founding the German renewable energy company, Wirsol, in 2003, and moving to Beijing in 2011, where he supervised global procurement and business development for Asia and the USA. 

Stefan Horn 

Director / Managing Partner APAC

80 Raffles Place

#33-00 UOB Plaza

Singapore 048624

phone: +60 172 548 748


"Asia is one of the most interesting upcoming photovoltaics markets – and absolutely fascinating to explore."

Stefan Horn, based in Kuala Lumpur, is responsible for general management and business development in Asia. Since he joined Greencells in 2015 from Hanwha Q. Cells, Stephan has harnessed his considerable experience of the solar industry to drive growth in Asia and beyond.

Ric Hallikeri 

Managing Partner MEA

A110a Incubator Building

Masdar City PO BOX: 54115


phone: +971 565 835 024


"In Europe, electricity is self-evident. In Africa, it is a necessity."

Ric Hallikeri, located in Abu Dhabi, is responsible for the Greencells solar plants business in the Middle East, Africa and Asia. Under his supervision, Greencells will build four solar parks with an overall capacity of 140 megawatts in the MEA within the next two to three years. Ric acquires new investors and is also the CEO of the newly-established Greencells Capital Partners, an Abu Dhabi-based fund for renewable energies. 

Ardi Arian

President / Managing Partner USA

112 South Tryon Street, Tryon Plaza, Suite 1100

Charlotte, NC 28284, USA

office no. +1 (646) 679-1977

cell no. +1 (646) 617-1113


Ardi is the Managing Partner of the USA subsidiary and is acting as a Project Manager for some of the EPC projects. Since 2007 he has developed and built over 50 solar projects in Europe. As an expert in large scale utility projects he consigned all his power plants with high satisfaction of the customer. His realized power plants are today operated by reputable fund like Aquilla, Chorus, Wattner, Greencity and Moserbaer. In 2013 he moved to New York, USA and lives now in California. He graduated from the Technical University Dortmund in Germany with a Master of Science (MSc) degree in Electrical Engineering. He is also audited from PMI and will be soon certified as PMP.

Ozay Sahin

General Manager Netherlands

Bahnhofstraße 28

66111 Saarbrücken


phone: 0681 992 669 0