Otto Van Geet, PE, LEED AP, is a Principal Engineer at NREL (National Renewable Energy Laboratory), with over 30 years of experience. Otto has been involved in the design and operation of energy efficient research facilities such as labs and data centers, general use facilities and low energy-use campus and community design. Otto was one of the founding members of the Labs21 program and provides technical guidance for the program. He is a Registered Professional Engineer, a Certified Energy Manager, a LEED Accredited Professional and a Project Management Professional. Otto and his family live in an off-grid passive solar house with a 2 kW PV/hybrid power system and solar water heating that he designed and built 19 years ago.