The occupation, 'Energy Engineers', include: Alternative Energy Engineer, Certified Green Building Engineer, Distributed Generation Project Manager, Energy Conservation Engineer, Energy Efficiency Engineer, and other titles.Energy Engineers design, develop, or evaluate energy-related projects or programs to reduce energy costs or improve energy efficiency during the designing, building, or remodeling stages of construction. may specialize in electrical systems; heating, ventilation, and air-conditioning (hvac) systems; green buildings; lighting; air quality; or energy procurement.