Hiolle Industries is a holding company that engages in the provision of environmental and industrial services. It operates through the following segments: Environment and Services, Clean Transportation and Railway, and Energy. The Environment and Services segment offers traditional industrial services for piping, electricity, hydraulic, heat treatment, mechanical, and metallurgical control and maintenance. The Clean Transportation and Railway segment offers maintenance, after-sale, and cabling services for contractors. The Energy segment engages in the design, installation, and maintenance of photovoltaic solar plants. The company was founded in 1976 and is headquartered in Prouvy, France.