Enhancing Electricity Audits in Residential Buildings with Nonintrusive Load Monitoring

Abstract

Non-Intrusive Load Monitoring (NILM) is a technique for deducing the power consumption and operational schedule of individual loads in a building from measurements of the overall voltage and current feeding it, using information and communication technologies (ICT). In this paper we review the potential of this technology to enhance residential electricity audits. First, we review the current commercially available whole-house and plug-level technology for residential electricity monitoring in the context of supporting audits. We then contrast this with NILM and show the advantages and disadvantages of the approach by discussing results from a prototype system installed in an apartment unit. Recommendations for improving the technology to meet the demands of residential audits are provided, along with ideas for possible future work in the field.