This paper aims to investigate effects of green product innovation and green process innovation on the performances of companies. It presents in-depth interviews with Alarko Carrier A.Ş. and Cenal Elektrik Üretim A.Ş. which are companies of Alarko Holding in Turkey. Alarko Carrier A.Ş. produces, sells, exports, imports, makes marketing activities and after sales services of cooling, heating and water pressurization systems. Cenal Elektrik Üretim A.Ş. is an electric plant which produces electricity from coal by conducting environmentally friendly innovation activities in their business processes. The in-depth interviews were conducted with middle level managers from these companies to find out their green product innovation and green process innovation practices and their effects on their company performances. It is found out that these companies have corporate cultures supporting their green product innovation and green process innovation practices which affect their financial performance and stakeholder performance. Additional in-depth interviews can be conducted with companies from other sectors for further studies.