Energy use consulting services help businesses design energy-efficient buildings, evaluate current energy usage, and develop energy management plans. They perform design reviews, energy audits, energy procurement assistance, project financing, litigation support, planning assistance, renewable energy project development, and technology training. During the design review process, energy consultants may propose changes to proposed electrical and mechanical sys are surveys of existing structures that examine the condition of lighting, heating, and cooling systems in existing structures. Energy use consulting services that provide energy procurement assistance can help clients select vendors and negotiate contracts. Government agencies and municipalities may also require independent review and project financing. For projects that involve litigation, energy use consulting services can serve as expert witnesses at both deposition and trial. Planning assistance enables facility managers to establish maintenance guidelines for energy conservation plans. Energy consultants who specialize in renewable energy may examine potential uses for wind energy, solar energy, biomass, or geothermal power. Technology training consists of on-going educational programs and materials for engineers and maintenance staff.