Southern California Edison commissioned a study that evaluates the relative certainty of existing energy estimates of miscellaneous energy loads (MELs) in residential buildings. The researcher conducted a literature review of existing MEL studies and to identify their respective underlying methodologies. This report provides an overview of alternative methods of estimating energy use and load disaggregation techniques using non-intrusive load monitoring, which has the potential to improve accuracy and lower the costs of estimating MEL energy use. This literature review is, by nature, a backward-looking study, and does not reflect the most up-to-date usage or energy consumption of new devices coming to market. This study is a review of existing estimates to clarify the uncertainty of existing data and identify the best available information for existing stock.