42 Energy Performance Contracting, namely, analyzing, designing and retrofitting energy related systems in a client's facility, including lighting, HVAC, chillers, boilers and building envelope; Process Engineering, namely, identification, design and implementation of a production process to maximize the use of resources, including the retrofit or optimization of steam systems, compressed air systems, wastewater treatment process or other systems which provide input energy and related raw materials (non-core systems) into the production process; energy usage management services for existing facilities and facilities under or proposed for construction