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Federal Register / Vol. 86, No. 153 / Thursday, August 12, 2021 / Proposed Rules
TABLE IV4ANALYZED EFFICIENCY LEVELS AND INCREMENTAL COSTS FOR MICROWAVE-ONLY OVENS AND COUNTERTOP
CONVECTION MICROWAVE OVENS
Standby power W

Efficiency level
Standby power level source
Baseline
1

Baseline current standard
Improved Power Supply Max-Tech

1.00
0.84

Incremental MPC
2019$
$ 0.16

lotter on DSK11XQN23PROD with PROPOSALS1

TABLE IV5ANALYZED EFFICIENCY LEVELS AND INCREMENTAL COSTS FOR BUILT-IN AND OVER-THE-RANGE
CONVECTION MICROWAVE OVENS
Standby power W

Efficiency level
Standby power level source
Baseline
1
2

Baseline current standard
Standard Power Supply
Improved Power Supply Max-Tech

D. Energy Use Analysis The purpose of the energy use analysis is to determine the annual energy consumption of microwave ovens at different efficiencies in representative U.S. single-family homes, multi-family residences, and manufactured homes, and to assess the energy savings potential of increased microwave oven efficiency. The energy use analysis estimates the range of energy use of microwave ovens in the field i.e., as they are actually used by consumers. The energy use analysis provides the basis for other analyses DOE performed, particularly assessments of the energy savings and the savings in consumer operating costs that could result from adoption of amended or new standards.
For this NOPD, DOE used the same methodology as that described in chapter 7 of the June 2013 Final Rule technical support document TSD.8
DOE primarily used data from the Energy Information Administration EIAs Residential Energy Consumption Survey RECS. RECS is a national sample survey of housing units that collects statistical information on the consumption of and expenditures for energy in housing units, along with data on energy-related characteristics of the housing units and occupants. RECS
was constructed by EIA to be a national representation of the household population in the United States. For the June 2013 Final Rule, DOE used RECS2009.9 For this NOPD, DOE
8 U.S. Department of Energy DOE, 20130617
Energy Conservation Program: Energy Conservation Standards for Standby Mode and Off Mode for Microwave Ovens; Final Rule. https
www.regulations.gov/document?D=EERE-2011-BTSTD-0048-0027.
9 U.S. Department of Energy DOE, 20130617
Energy Conservation Program: Energy Conservation
VerDate Sep<11>2014

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updated the household sample to RECS2015. RECS2015 includes data specific to microwave oven use frequency, whereas RECS2009
frequency usage was estimated from overall numbers of cooked meals.
For each household, RECS2015
provides information on the frequency of microwave oven usage per week. DOE
calculated the RECS usage factor for each household in the sample by multiplying the frequency of use by 52
weeks per year and dividing by the weighted-average usage based on the entire RECS sample. The weightedaverage usage was calculated by summing the average microwave use frequency per week as reported in RECS
and multiplying by 52 weeks per year and by the housing record weight before dividing by the sum of housing record weights for the housing sample.
DOE determined the annual energy consumption of the standby mode and off mode of microwave ovens by estimating the number of hours of operation throughout the year and assuming that the unit would be in standby mode and off mode the rest of the time. For the June 2013 Final Rule, DOE determined the average hours of operation for microwaves to be 44.9
hours per year. DOE subtracted the number of calculated operating hours from the total number of hours in a year and multiplied that difference by the standby mode power usage at each efficiency level to determine annual standby mode and off mode energy consumption.
CA IOUs stated that microwave ovens spend approximately 53 hours annually in active mode. CA IOUs, No. 7 at p.
Standards for Standby Mode and Off Mode for Microwave Ovens; Final Rule. https
www.regulations.gov/document?D=EERE-2011-BTSTD-0048-0027.

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2.20
1.16
1.00

Incremental MPC
$2019
$0
0.16

3 DOE reviewed CA IOUs 2014
study 10 and found the sample size to be relatively small at 122 households and geographically limited, as compared to RECS. DOE acknowledges the benefit of using field-metered studies for energy use; however, DOE concluded that a larger study with greater geographic area would be helpful before amending the active hours used.
Chapter 7 of the June 2013 Final Rule TSD provides details on DOEs energy use analysis for microwave ovens.
E. National Energy Savings For the present analysis, DOE
projected the energy savings, over the lifetime of microwave ovens sold from 2024 through 2053. DOE evaluates the effects of new or amended standards by comparing a case without such standards with standards-case projections. The no-new-standards case characterizes energy use for each microwave oven class in the absence of new or amended energy conservation standards. For this projection, DOE
considers historical trends in efficiency and various forces that are likely to affect the mix of efficiencies over time.
DOE compares the no-new-standards case with projections characterizing the market for each microwave oven class if DOE adopted new or amended standards at specific energy efficiency levels i.e., the standards cases for that class. For the standards cases, DOE
considers how a given standard would likely affect the market shares of microwave oven with efficiencies greater than the standard.
10 CALMAC Study ID: SCE0360.01. 2014.
Literature Review of Miscellaneous Energy Loads MELs in Residential Buildings. https
www.calmac.org/publications/MEL_Literature_
Review_6_10_14.pdf.

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