In 2009, the California Energy Commission funded and administered a Residential Appliance Saturation Study (RASS) that serves as an update to the 2003 RASS, with the same utilities participating - Pacific Gas and Electric Company (PG&E), Southern California Edison (SCE), San Diego Gas & Electric Company (SDG&E), Southern California Gas Company (SoCal Gas), and Los Angeles Department of Water and Power (LADWP).

The study was implemented as a mail survey with an option for respondents to complete it online. The survey requested households to provide information on appliances, equipment, and general consumption patterns. Data collection was completed in early 2010.

The study yielded energy consumption estimates for 27 electric and 10 natural gas residential end-uses and appliance saturations for households. These consumption estimates were developed using a conditional demand analysis, an approach that applied statistical methods to combine survey data, household energy consumption data and weather information to calculate average annual consumption estimates per appliance. The 2009 RASS resulted in end-use saturations for 24,464 individually metered and 1,257 master-metered households. Survey and conditional demand analysis results were weighted to provide population level estimates representative of the participating utilities that allow comparison across utility service territories, forecast climate zones and other variables of interest- dwelling type, dwelling age group, and income.

The 2018 RASS study is currently being prepared by the Energy Commission and will be available June 2019.

The list of documents below are no longer available on our website, but can be obtained via Internet Archives Wayback Machine at http://web.archive.org/web/20190601194456/https://www.energy.ca.gov/appliances/rass/previous_rass.html

2009 Residential Appliance Saturation Study

  • Executive Summary
    (PDF file, 56 pages, 549 kb)

  • Volume 1 - Methodology
    PDF file, 145 pages, 1.2 mb

  • Volume 2 - Study Results
    PDF file, 37 pages, 430 kb

  • Appendices
    PDF file, 261 pages, 24.6 mb

  • Banner Subset - RASS Total Results
    PDF file, 1870 pages, 2.8 mb

  • Banner subset - PG&E
    Subset of Volume 2 Banners - PG&E results. PDF file, 2 mb

  • Banner subset - SCE
    Subset of Volume 2 Banners - SCE results. PDF file, 2.1 mb

  • Banner subset - SDG&E
    Subset of Volume 2 Banners - SDG&E results. PDF file, 2.0 mb

  • Banner subset - LADWP
    Subset of Volume 2 Banners - LADWP results. PDF file, 2.0 mb

  • Banner subset - SoCalGas
    Subset of Volume 2 Banners - SoCalGas results. PDF file, 2.1 mb

KEMA Residential Appliance Saturation Study Database

Data from the above report was originally available through the KEMA Residential Appliance Saturation Study Database, which allows interactive queries.

Disclaimer: the KEMA database is neither sponsored nor maintained by the California Energy Commission. The Energy Commission, therefore, makes no warrant, express or implied, and assumes no legal liability for information found in the database and accompanying website.

2003 Residential Appliance Saturation Study

  • Executive Summary
    Statewide overview of study results. PDF file, 42 pages, 309 kb

  • Volume 1 - Methodology
    Description of study design, process, and overview of results. PDF file, 162 pages, 628 kb

  • Volume 1 - Methodology and Appendices
    Description of study design, process, and overview of results. PDF file, 417 pages, 2.8 mb

  • Volume 2 - Study Results
    Detailed UEC results. PDF file, 30 pages, 140 kb

  • Volume 2 - Study Results and Banners
    Detailed UEC results and saturation banners
    PDF file, 7,387 pages, 12.3 mb

  • Banner subset - RASS Total
    Subset of Volume 2 Banners - RASS total results. PDF file, 1.6 mb

  • Banner subset - PG&E
    Subset of Volume 2 Banners - PG&E results. PDF file, 2.2 mb

  • Banner subset - SCE
    Subset of Volume 2 Banners - SCE results. PDF file, 1.6 mb

  • Banner subset - SDG&E
    Subset of Volume 2 Banners - SDG&E results. PDF file, 2.0 mb

  • Banner subset - LADWP
    Subset of Volume 2 Banners - LADWP results. PDF file, 2.0 mb

  • Banner subset - SoCalGas
    Subset of Volume 2 Banners - SoCalGas results. PDF file, 2.1 mb

  • California Statewide Residential Appliance Saturation Study Update to Air-Conditioning Unit Energy Consumption Values Using 2004 Billing Data
    Consultant Report. PDF file, 812 kb. On line: 7/6/2006.