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Federal Register / Vol. 86, No. 243 / Wednesday, December 22, 2021 / Proposed Rules
appropriately reflect general consumer usage of the normal cycle. Whereas, establishing a threshold that is too low would not appropriately reflect the percentage of cycles for which consumers are likely to select a more energy-intensive cycle to achieve better cleaning performance than can be achieved on the normal cycle.
DOE used the data presented in Figure III.1 and the consumer usage
weighting factors specified in appendix C1 and proposed to be retained in appendix C1 and the newly proposed appendix C2 for the heavy 0.05, medium 0.33, and light 0.62 soil loads to calculate the percentage of cycles that would need to be tested at a more energy-intensive cycle than the normal cycle i.e., the percentage of cycles that would not meet the
threshold at each point.29 The percentage of cycles that would need to be tested at a more energy-intensive cycle than the normal cycle is shown in Figure III.2, along with the range for the percentage of cycles that would operate on a more energy-intensive cycle than the normal cycle as estimated from industry data.

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Cleaning Index

Based on the results in Figure III.1
and Figure III.2, DOE proposes establishing a minimum cleaning index of 65 as the threshold level for a test cycle to be valid. At a cleaning index of 65, the percentage of test cycles at each soil level that would achieve the minimum cleaning index threshold is 97 percent for lightly soiled loads, 65
percent for medium soiled loads, and 58
percent for heavily soiled loads. On a weighted-average basis, the measured normal test cycles would reach the threshold cleaning index of 65
approximately 84 percent of the time i.e., 16 percent of cycles would not meet the threshold, as shown in Figure III.2.30 The 16-percent rate
representing the overall percentage of cycles that would need to be tested using the most energy-intensive cycle would align with DOEs estimate of roughly 12 to 23 percent of cycles being operated using a more energy-intensive cycle than the normal cycle.
DOE also considered other cleaning index threshold values, such as 70, which would align with the ENERGY
STAR Most-Efficient criteria, and values below 65. However, for a cleaning index threshold of 70, 22 percent of the cycles would need to be tested at the most energy-intensive cycle, which is close to the upper bound of DOEs estimated threshold i.e., 23 percent for the percentage of cycles that would likely
be tested at a more energy-intensive cycle compared to the normal cycle. At a cleaning index threshold of 60, only 10 percent of cycles would need to be tested at the most energy-intensive cycle, which is outside the representative range estimated by DOE
from industry-supplied data. While the percentage of cycles estimated to operate at the most energy-intensive cycle to meet a cleaning index threshold of 70 is within the range of cycles that DOE estimates are conducted on a more energy-intensive cycle than the normal cycle, DOE is proposing a cleaning index threshold of 65 because it is closer to the mid-point of the range of 12 to 23 percent of cycles that are likely
29 Percent of cycles likely to be operated on a more energy-intensive cycle than the normal cycle calculated as 100 percent percentage of cycles meeting the threshold level at each point.

30 DOE estimates the overall rate as a weighted average of the rate at each soil load times the frequency of consumer usage of each soil load; i.e., 97 percent lightly soiled 0.62 + 65 percent

0.33 + 58 percent 0.05 = 84 percent overall rate that meets a threshold of 65. Therefore, 16 percent of cycles would not meet the threshold of 65.

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Figure 111.2 Percentage of Cycles that Would Be Tested at a More Energy-Intensive Cycle than the Normal Cycle at each Cleaning Index Threshold