Measured Retrofit Savings From Efficient Lighting And Smart Power Strips

Report Number




Energy Efficiency; Electrical Loads; Electric Power; Buildings


A lighting and smart power strip retrofit evaluation was conducted on 56 all-electric, existing Florida homes to see how lighting and miscellaneous electric loads might be reduced. Retrofits were conducted from March to June 2013. Detailed end-use electricity consumption is being monitored for two years, spanning pre- and post-retrofit. This paper summarizes the end use energy savings and economic evaluation results from lighting and smart plug measures.

The lighting retrofit included changing incandescent lighting to CFL or LED. Results from pre-retrofit monitoring revealed that the lighting and plug loads constituted 22% of total site electricity consumption (7.7 kWh per day). A short-term analysis of the study homes, for which 56% of bulbs were changed-out, showed a seasonally adjusted reduction to total site power of 1.2 kWh per day.

Home devices such as computers, printers, and gaming centers continue to draw power when unused but left in their low power modes. Advanced Power Strips (APS) can reduce this wasted energy. To study their potential savings, entertainment center energy use was submetered in all homes. APSs were intended to be installed in those with low power loads of at least 10 watts, but only nine had both homeowner acceptance and large enough power losses. Often equipment above the energy loss threshold could not be shut down (e.g. remote printers, DVRs) without functionality loss. Average low power mode draw for the final dataset was 15 watts and monitored data showed the APS saved between 0.2 and 0.7 kWh per day over preretrofit.

Date Published



This paper published in the Proceedings of the 2014 ACEEE Summer Study on Energy Efficiency in Buildings,

© 2014 American Council for an Energy Efficient Economy

Local Subjects

Electric Power; Buildings - Electrical Loads; Buildings - Energy Efficiency


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