Dr S.Kapellos is a graduate of the Chemical Department of the University of Athens. He received a PhD on the field of Physical Chemistry from the same Institution. Between 1993 and 2007, he had the opportunity to fill various managerial posts within the BP Hellas Organization: Quality, Health, Safety and Environment, Human Resources, Customer Services, Pricing and Credit, Retail Fuels District Manager Northern Greece.

In 2007, he is appointed as the CEO of BP Solar Hellas, to setup the new business.

Since 2010, he works for HELLENiQ RENEWABLES, 100% owned by HELLENiQ ENERGY Group (Former Hellenic Petroleum). He currently holds the position of the Chief Operating Officer and BoD member of the company. Τhe RES portfolio of HELLENiQ RENEWABLES is comprised of more than 4 GW of PV, Wind and Storage Projects, of which 241 MW PV and 100 MW Wind in operation in Greece and 41 MW PV in Cyprus. HELLENiQ RENEWABLES recently announced the acquisition of an under construction 180 MW PV project in Kozani and another one 211 MW in Romania, both to be fully operational in 2025. Adding up another PV project of 200 MW in Evros and the 100 MW Battery Storage that has been won in the last auction, both to be operational in 2025, the target of HELLENiQ to operate 1 GW RES projects in 2025 has already been secured.

Dr.S.Kapellos has published several scientific articles in international magazines during his academic career and several articles on subjects related to RES, Solar Technology and Energy Policy for newspapers, relevant magazines and e-media.

Since 2008, he is being an elected member of the board of the Hellenic Association of PV companies (HELAPCO) and since April 2013 Chairman of the board of the Association. Since April 2021 he has been elected as President of the Energy Committee of the Hellenic-German Chamber of Industry and Commerce.