Internal DOE Report
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Miscellaneous electrical loads (MELs) are building loads that are not related to general lighting, heating, ventilation, cooling, and water heating, and typically do not provide comfort to the building occupants. MELs in commercial buildings account for almost 5% of U.S. primary energy consumption. On an individual building level, they account for approximately 25% of the total electrical load in a minimally code-compliant commercial building, and can exceed 50% in an ultra-high efficiency building such as the National Renewable Energy Laboratory's (NREL) Research Support Facility (RSF). Minimizing these loads is a primary challenge in the design and operation of an energy-efficient building. A complex array of technologies that measure and manage MELs has emerged in the marketplace. Some fall short of manufacturer performance claims, however. NREL has been actively engaged in developing an evaluation and selection process for MELs control, and is using this process to evaluate a range of technologies for active MELs management that will cap RSF plug loads. Using a control strategy to match plug load use to users' required job functions is a huge untapped potential for energy savings.
This series of fact sheets was developed by the U.S. Department of Energy’s Hospital Energy Alliance. These fact sheets help hospital and healthcare institution owners and operators use effective, energy-efficient technologies and practices to decrease energy consumption and its related costs and to address energy-related environmental issues. Each fact sheet covers a particular area of potential savings in healthcare facilities and includes one or more hospital case studies: Building Envelope Fact Sheet, Boilers Fact Sheet, Chillers Fact Sheet, CHP Fact Sheet, Existing Building Commissioning Fact Sheet, Energy Management Program Fact Sheet, Fast Paybacks Fact Sheet, Ground Source Heat Pumps Fact Sheet, HVAC Fact Sheet, Integrated Building Design Fact Sheet, Lighting Fact Sheet, Plug Loads Fact Sheet, Water Efficiency Fact Sheet.