California 2019 Residential Appliance Saturation Study (RASS)

The California Residential Appliance Saturation Study (RASS) is a comprehensive study of residential sector energy use. The California Home Energy Survey is the primary data source for the RASS, and will be sent to a select group of California residents from August through Dec 2019. The California Home Energy Survey will be provided in both web and mail versions and asks households to provide information about their appliances, heating and cooling equipment, use of solar or electric vehicles, and general energy use. The RASS supports the California Energy Commission’s (Energy Commission) residential sector energy demand forecast model, and is conducted periodically with two previous studies completed in 2009 and 2003.

The project is managed by the Energy Commission in cooperation with all major investor-owned utilities including Southern California Edison (SCE), Pacific Gas and Electric (PG&E), Southern California Gas (SoCalGas), and San Diego Gas and Electric (SDG&E), as well as major publicly-owned utilities including the Los Angeles Department of Water and Power (LADWP) and the Sacramento Municipal Utility District (SMUD). The project is expected to be completed by March of 2020.

Project Goals & Objectives

  • Calculate appliance saturations at the forecasting zone level by home type fuel use.

  • Calculate estimates of annual energy for appliances by home type and fuel use at the forecasting zone level.

  • Incorporate advanced metering infrastructure (AMI) electricity consumption data into forecasting model input development.

  • Enhance the RASS study database, a third-generation interactive database, with which the public may research residential saturation and consumption data collected and analyzed through the RASS process. This database relates the results of all three Energy Commission RASS projects (for 2003, 2009, and 2019 when it is completed).

Project Design and Methodology

The proposed design of this survey is methodologically consistent with the 2003 and 2009 surveys. The primary means of data collection is through surveys administered via a web portal or a paper booklet. The participants are selected randomly by utility service area, climate region, home type, and energy consumption level. Close to 300,000 California homes will be recruited by email and/or mailed invitations to provide information for this survey.

DNV GL Energy Insights USA, Inc. has been hired by the Energy Commission to conduct the 2019 RASS.

For more information, please contact:

Glen Sharp
Project Manager
California Energy Commission
Phone: 916-654-4764


Le-Huy Nguyen
California Energy Commission
Phone 916-654-4599