Lecturing in Energy Management, Green Engineering, Sustainable Energy, and Battery Technology at the Technological University of the Shannon (TUS). He teaches across Level 8 and Level 9 programmes, including modules in renewable energy utilisation, community energy development, energy infrastructure, and energy auditing.
Born in 1960, received early education at Newtown School in Waterford before pursuing engineering studies. He earned a Certificate and Higher Diploma in Environmental Engineering from Bolton Street College, Dublin, followed by a B.Eng. (Hons) in Environmental Engineering from South Bank Polytechnic in London. Studies covered key engineering disciplines such as thermodynamics, fluid mechanics, heat transfer, electrical engineering, and building environmental systems.
Before entering academia, building extensive professional experience in engineering consultancy and the renewable energy sector. Early career included work with engineering consultancies in Dublin and London, where he contributed to the design of building services systems and hospital infrastructure projects. Since the mid-1990s, he has been involved in renewable energy development in Ireland, working on wind energy projects, combined heat and power systems, and energy market participation. Owned, operated and maintained a 1.65MW Wind turbine over a period of 20 years
Hannevig has also contributed to research and innovation in offshore wind energy, including co-authoring research on gravity foundations for offshore wind turbines and holding a patent related to floating wind turbine technology.