Guilliams Group

About

Founded in 2008, Guilliams Group is a private headquartered in Tienen, Belgium with approximately 50-200 employees specializing in Biogas.

Guilliams Group is a Belgian family enterprise founded in 2008, led by three brothers (Rohald, Reinout, and Ruben). The group comprises four complementary divisions: Guilliams Green Power (biogas generation and water treatment), Guilliams Construction Solutions (residential and commercial construction), Guilliams Recycle Solutions (organic waste processing), and Guilliams Logistic Solutions (transport and logistics). The flagship Guilliams Green Power biogas facility in Boutersem processes approximately 90,000 tons of organic waste annually, generating 3 MW of electricity and heat via combined heat and power (CHP) with over 90% uptime. The facility produces power equivalent to 7,833 households and supplies electricity to Belgium's first renewable-powered charging station. In 2022, the installation added advanced water treatment technology achieving complete water self-sufficiency. Guilliams Recycle Solutions holds official waste processing certification and can process 300,000 tons of organic waste annually, making it one of Belgium's largest organic waste processors. The group operates according to circular economy principles and focuses on sustainable construction, waste valorization, and renewable energy generation.

Projects