10-D-i

APPENDIX 10-D. NATIONAL ENERGY SAVINGS AND NET PRESENT VALUE 

USING ALTERNATIVE BASE CASE EFFICIENCY TREND

TABLE OF CONTENTS

10-D.1 INTRODUCTION ...............................................................................................10-D-1

10-D.2 NIA RESULTS USING ALTERNATIVE BASE CASE EFFICIENCY 

TREND ................................................................................................................10-D-4

LIST OF TABLES

Table 10-D.1.1 Dishwasher Alternative Base-Case Efficiency Distributions..................10-D-1

Table 10-D.1.2 Standard-size Dishwashers: Standards Case Market Shares by TSL ......10-D-3

Table 10-D.1.3 Compact Dishwashers: Standards Case Market Shares by TSL..............10-D-3

Table 10-D.2.1 Cumulative National Energy Savings and National Water Savings, 

Alternative Base Case Efficiency Trend..................................................10-D-4

Table 10-D.2.2 Cumulative Net Present Value of Consumer Benefits, Alternative Base 

Case Efficiency Trend..............................................................................10-D-5

LIST OF FIGURE

Figure 10-D.1.2 Standard-Size Dishwashers: Alternative Standards Case Efficiency 

Projections................................................................................................10-D-4
10-D-1

APPENDIX 10-D. NATIONAL ENERGY SAVINGS AND NET PRESENT VALUE 

USING ALTERNATIVE BASE CASE EFFICIENCY TREND

10-D.1 INTRODUCTION

This appendix presents national energy savings (NES) and net present value (NPV) 

results using an alternative base case efficiency trend. 

Appendix 8-F describes how DOE developed a base-case energy efficiency distribution 

(which yields a shipment-weighted average efficiency) for each of the considered product classes 

for the first year of the forecast period. Table 10.D.1.1 provides the base-case efficiency 

distributions for the three years in which AHAM provided data (2008-2010, standard-size only) 

as well as DOE’s projection for 2013 (the assumed effective date of new consensus standards) 

and 2018 (the assumed effective date of new standards in the absence of a consensus agreement). 

Table 10-D.1.1 Dishwasher Alternative Base-Case Efficiency Distributions

Standard-Size Compact

Efficiency 

Level 2008 2009 2010 Base Case Base Case

2013 2018 2013 2018

Baseline 56.4% 38.7% 3.8% 3.8% 3.8% 25.0% 25.0%

1 30.0% 41.1% 51.8% 43.2% 15.1% 25.0% 25.0%

2 7.8% 8.9% 21.5% 28.0% 32.7% 50.0% 50.0%

3 5.8% 5.2% 15.3% 16.4% 18.5% -- --

4 0.0% 4.0% 5.0% 8.6% 14.7% -- --

5 0.0% 2.0% 2.5% 0.0% 15.1% -- --

SWAEU 338.4 326.5 309.0 307.9 279.2 197.5 197.5

SWWU 6.04 5.75 5.21 4.83 4.69 3.05 3.05

SWAEU: Shipment weighted annual energy use

SWWU: Shipment weighted water use

To project the trend in efficiency for standard-sized dishwashers over the entire forecast 

period, DOE extended the exponential curve that it derived from historical data on shipmentweighted average kWh per year. The projected trend is depicted in the figure below. This 

projection was not performed for compact clothes washers, as not enough data were available.
10-D-2

Figure 5-P.1.1 Standard-Size Dishwashers: Alternative Base Case Efficiency Projection

To determine the standards-case efficiencies, DOE assumed a “roll-up” scenario to 

establish the shipment-weighted efficiency for the year that standards are assumed to become 

effective (i.e., 2013 or 2018). DOE assumed that product efficiencies in the base case that did not 

meet the standard level under consideration would “roll up” to meet the new standard level. 

Also, DOE assumed that all product efficiencies in the base case that were above the standard 

level under consideration would not be affected. The tables below display the roll-up scenarios 

used in this analysis for each TSL.

150

200

250

300

350

400

450

1990 2000 2010 2020 2030 2040 2050

Annual Energy Use (kWh/year)

AHAM Data

Projected Values

Expon. (AHAM Data)
10-D-3

Table 10-D.1.2 Standard-size Dishwashers: Standards Case Market Shares by TSL

TSL

Efficiency 

Level

AEU

(kWh) Base Case 1(2018)

2

(2013)

3

(2018)

4

(2018)

Baseline 355 3.8% - - - -

1 324 15.1% 18.9% - - -

2 307 32.7% 32.7% 75.0% - -

3 295 18.5% 18.5% 16.4% - -

4 234 14.7% 14.7% 8.6% 84.9% -

5 180 15.1% 15.1% 0.0% 15.1% 100.0%

SWAEU (kWh) 279.2 278.0 298.8 225.8 180.0

SWWU (gal) 4.35 4.32 4.77 3.47 1.60

SWAEU: Shipment weighted annual energy use

SWWU: Shipment weighted water use

Table 10-D.1.3 Compact Dishwashers: Standards Case Market Shares by TSL

TSL

Efficiency 

Level

AEU

(kWh) Base Case 1(2018)

2

(2013)

3

(2018)

4

(2018)

Baseline 260 25.0% - - - -

1 222 25.0% 50.0% 50.0% - -

2 154 50.0% 50.0% 50.0% 100.0% 100.0%

SWAEU (kWh) 197.5 188.0 188.0 154.0 154.0

SWWU (gal) 3.05 2.80 2.80 2.10 2.10

SWAEU: Shipment weighted annual energy use

SWWU: Shipment weighted water use

Using the shipment-weighted efficiency in the compliance year as a starting point, DOE 

maintained the same growth rate for projected efficiencies in the standards case as in the base 

case. DOE assumed, however, that the average kWh per year would not drop below the max-tech 

efficiency level. The figure below illustrates the projected trend for each TSL.
10-D-4

Figure 10-D.1.2 Standard-Size Dishwashers: Alternative Standards 

Case Efficiency Projections

10-D.2 NIA RESULTS USING ALTERNATIVE BASE CASE EFFICIENCY TREND

Table 10-D.2.1 Cumulative National Energy Savings and National Water Savings, 

Alternative Base Case Efficiency Trend

Trial Standard 

Level

Efficiency Levels NES NWS

Standard Compact quads trillion gal

1 1 1 0.01 0.02

2 2 1 0.13 0.15

3 4 2 0.48 0.50

4 5 2 0.60 0.71
10-D-5

Table 10-D.2.2 Cumulative Net Present Value of Consumer Benefits, Alternative Base 

Case Efficiency Trend

TSL

Efficiency Level 

Combination NES (quads) NWS (billion gallons)

StandardSizedCompactsized7% 

discounted

3% 

discounted

7% 

discounted

3%

discounted

1 1 1 0.00 0.01 0.00 0.01

2 2 1 0.04 0.07 0.05 0.08

3 4 2 0.14 0.27 0.13 0.27

4 5 2 0.18 0.35 0.21 0.40