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Federal Register / Vol. 86, No. 243 / Wednesday, December 22, 2021 / Proposed Rules recognizes that the cleaning performance of the normal cycle may not always meet consumer expectations of cleaning performance. See for example: Toronto, EERE2018BT
STD0005, No. 2304 at p. 1; Carley, EERE2018BTSTD0005, No. 2950 at p. 1; Bruggeman, EERE2018BTSTD
0005, No. 3038 at p. 1; etc. Further, confidential data submitted by manufacturers indicate, in the aggregate, that roughly 2545 percent of all dishwasher cycles are conducted on a cycle other than the normal cycle. DOE
recognizes that among these other selected cycles, some would be expected to be less energy intensive than the normal cycle e.g., a glassware cycle, while others would be expected to be more energy intensive than the normal cycle e.g., a pots and pans cycle. The data provided by manufacturers do not indicate which types of cycles comprise the percentage of cycles not conducted on the normal cycle. In lieu of additional details
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regarding the dataset, DOE has proceeded under the assumption that either option selecting a more energyintensive or less energy-intensive alternate cycle is equally as likely.
Accordingly, DOE estimates that onehalf i.e., 12 to 23 percent of cycles not conducted on the normal cycle are instead conducted on a cycle that is more energy intensive than the normal cycle.
Since DOE expects that consumers unsatisfied with the cleaning performance of the normal cycle would select alternate cycles that are more energy-intensive to achieve better cleaning results, the cycle selection data serves as a reasonable proxy for consumer acceptance of the cleaning performance of the normal cycle. To identify an appropriate cleaning index threshold, DOE sought to select a cleaning index value that aligned with the cycle selection data. That is, DOE
sought to identify the cleaning index value that was achieved between 77 to
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88 percent of the time when a dishwasher was operated on the normal cycle, indicating that the remaining 12
to 23 percent of the time the cleaning performance on the normal cycle would be worse and thus would result in consumers selecting more energyintensive cycles. DOE evaluated the cleaning indices measured for the heavy, medium, and light soil load cycles as defined in the DOE
dishwasher test procedure, using the market-representative dishwasher test sample from the October 2020 Final Rule.28 Using these data, DOE plotted the rate at which test cycles would achieve each potential cleaning index threshold level in increments of 5 on the Cleaning Index scale. Figure III.1
shows the percentage of each of the soil test cycles that meet the threshold at each potential threshold level among all the units in the test sample. The proposed threshold level of 65 is indicated by the dashed line and is described further as follows.

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Cleaning Index Heavy Only - - Medium Only -e- - Light Only -

Proposed deaning Index Threshold
In determining a threshold, DOE seeks to establish a level that ensures the tested cycle produces test results, which measure energy use and water use of the
dishwasher during a representative average use cycle. Establishing a threshold level that is too high would indicate that a substantial number of
dishwasher cycles performed by consumers do not meet consumer expectations for cleaning performance on the normal cycle, which would not
28 The test sample consisted of 31 units spanning 13 brands. The units selected for testing represented
over 95 percent of dishwasher manufacturers and
were broadly representative of the current dishwasher market. 85 FR 68723, 68724.

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Figure 111.1 Percent of Heavy, Medium, and Light Soil Test Cycles that Meet Potential Cleaning Index Thresholds