This document is a correction to the Department of Energy’s notice of proposed rulemaking: 

Energy Conservation Standards for Distribution Transformers, a rulemaking action issued by the 

Department of Energy. Though it is not intended or expected, should any discrepancy occur 

between the attached document and the document published in the Federal Register, the Federal 

Register publication controls. This document is being made available solely as a means to 

facilitate the public's access to this document. 
 

 

[6450-01-P]
 

DEPARTMENT OF ENERGY
 

10 CFR Part 431
 

[Docket Number EERE–2010–BT–STD–0048]
 

RIN: 1904-AC04
 

Energy Conservation Program: Energy Conservation Standards for Distribution 

Transformers; Correction 

AGENCY: Office of Energy Efficiency and Renewable Energy, Department of Energy. 

ACTION Notice of proposed rulemaking and public meeting; correction. 

SUMMARY: The U.S. Department of Energy (DOE) published a notice of proposed 

rulemaking on February 10, 2012, which proposed to amend DOE regulations regarding 

energy conservation standards for distribution transformers. It was recently discovered 

that values in certain tables of the proposed rule are inaccurate or absent. This notice 

corrects these inaccuracies as described. 

DATES: DOE will accept comments, data and information regarding this correction 

before and after the February 23, 2012, public meeting, but no later than April 10, 2012. 

FOR FURTHER INFORMATION CONTACT: 

1
 
 

 

 

 

James Raba, U.S. Department of Energy, Office of Energy Efficiency and 

Renewable Energy, Building Technologies Program, EE-2J, 1000 Independence Avenue, 

SW., Washington, DC, 20585-0121. Telephone: (202) 586-8654. E-mail: 

Jim.Raba@ee.doe.gov. 

Ami Grace-Tardy, U.S. Department of Energy, Office of the General Counsel, 

GC-71, 1000 Independence Avenue, SW., Washington, DC, 20585-0121. Telephone: 

(202) 586-5709. E-mail: Ami.Grace-Tardy@hq.doe.gov. 

SUPPLEMENTARY INFORMATION: 

Background 

Title III, Part B of the Energy Policy and Conservation Act of 1975 (EPCA or the 

Act), Pub. L. 94-163 (42 U.S.C. 6291-6309, as codified), established the Energy 

Conservation Program for “Consumer Products Other Than Automobiles.” Part C of Title

III of EPCA (42 U.S.C. 6311–6317) established a similar program for “Certain Industrial 

Equipment,” including distribution transformers. The Energy Policy Act of 1992 

(EPACT 1992), Pub. L. 102-486, amended EPCA and directed DOE to prescribe energy 

conservation standards for distribution transformers. (42 U.S.C. 6317(a)) On October 12, 

2007, DOE published a final rule that established energy conservation standards for 

liquid-immersed distribution transformers and medium-voltage, dry-type distribution 

transformers (72 FR 58190). The Energy Policy Act of 2005 (EPACT 2005), Pub. L. 

109-25, amended EPCA to establish energy conservation standards for low-voltage, drytype distribution transformers. (42 U.S.C. 6295(y)) On February 10, 2012, DOE 

2
 
 

 

 

 

published a proposed rule with amended energy conservation standards for liquidimmersed, medium-voltage dry-type, and low-voltage, dry-type distribution transformers 

(77 FR 7282). 

Need for Correction 

As published, values in certain tables of the proposed rule are inaccurate or 

absent. DOE solicits public comment on the changes contained in this document as part 

of the February 10 NOPR. 

Corrections 

In proposed rule FR Doc. 2012–2642 appearing on page 7282 in the issue of 

Friday, February 10, 2012, the following corrections should be made: 

1. On page 7285, Table I.5 is corrected to read as follows: 

3
 
 

 

Table I.5. Proposed Electrical Efficiencies for all Liquid-Immersed Distribution 

Transformer Equipment Classes (Compliance Starting January 1, 2016) 

Standards by kVA and Equipment Class 

Equipment Class 1 Equipment Class 2 

kVA % kVA % 

10 98.70 15 98.65 

15 98.82 30 98.83 

25 98.95 45 98.92 

37.5 99.05 75 99.03 

50 99.11 112.5 99.11 

75 99.19 150 99.16 

100 99.25 225 99.23 

167 99.33 300 99.27 

250 99.39 500 99.35 

333 99.43 750 99.40 

500 99.49 1000 99.43 

667 99.52 1500 99.48 

833 99.55 2000 99.51 

2500 99.53 

2. On page 7344, Table V.9 is corrected to read as follows: 

Table V.9. Summary Life-Cycle Cost and Payback Period Results for Design Line 6 

Representative Unit 

Trial Standard Level 

1 2 3 4 5 6 

Efficiency (%) 98.00 98.60 98.80 99.17 99.17 99.44 

Transformers with Net Increase in 

LCC (%) 0.0 71.5 17.6 36.2 36.2 93.4 

Transformers with Net LCC 

Savings (%) 0.0 28.5 82.4 63.8 63.8 6.6 

Transformers with No Impact on 

LCC (%) 100.0 0.0 0.0 0.0 0.0 0.0 

Mean LCC Savings ($) 0 -125 303 187 187 -881 

Median PBP (Years) 0.0 24.7 12.8 16.3 16.3 32.4 

3. On page 7346, Table V.20 is corrected to read as follows: 

4 
 

 

 

Table V.20 Rebuttable-Presumption Payback Periods (years) for Low-Voltage DryType Distribution Transformers 

Design Rated Trial Standard Level 

Line Capacity 

(kVA) 1 2 3 4 5 6 

6 25 0.0 15.9 13.5 15.0 15.0 26.5 

7 75 4.2 4.2 4.4 6.4 6.4 14.9 

8 300 6.8 6.8 10.4 9.7 20.2 20.2 

4. On page 7363, Table V.39 is corrected to read as follows: 

Table V.39 Proposed Energy Conservation Standards for Liquid-Immersed 

Distribution Transformers 

Standards by kVA and Equipment Class 

Equipment Class 1 Equipment Class 2 

kVA % kVA % 

10 98.70 15 98.65 

15 98.82 30 98.83 

25 98.95 45 98.92 

37.5 99.05 75 99.03 

50 99.11 112.5 99.11 

75 99.19 150 99.16 

100 99.25 225 99.23 

167 99.33 300 99.27 

250 99.39 500 99.35 

333 99.43 750 99.40 

500 99.49 1000 99.43 

667 99.52 1500 99.48 

833 99.55 2000 99.51 

2500 99.53 

5. On pages 7363 and 7364, Table V.41 is corrected to read as follows: 

Table V.41 Summary of Analytical Results for Low-Voltage, Dry-Type Distribution 

Transformers: Manufacturer and Consumer Impacts 

Category TSL 1 TSL 2 TSL 3 TSL 4 TSL 5 TSL 6 

Manufacturer Impacts 

Industry NPV (2011$ 

million) 

203 to 

236 

200 to 

235 

193 to 

240 

173 to 

250 

164 to 

263 

136 to 

322 

5
 
 

 

 

 

 

Industry NPV (% 

change) 

(7.7) to 

7.7 

(8.9) to 

6.8 

(12.2) 

to 9.1 

(21.0) 

to 14.1 

(25.2) 

to 20.0 

(37.9) 

to 46.4 

Consumer Mean LCC Savings (2010$) 

Design line 6 0 -125 303 187 187 -881 

Design line 7 1714 1714 1793 2270 2270 270 

Design line 8 2476 2476 2625 4145 -2812 -2812 

Consumer Median PBP (years) 

Design line 6 0.0 24.7 12.8 16.3 16.3 32.4 

Design line 7 4.5 4.5 4.7 6.9 6.9 18.1 

Design line 8 8.4 8.4 12.3 11.0 24.5 24.5 

Distribution of Consumer LCC Impacts 

Design line 6 

Net Cost (%) 0.0 71.5 17.6 36.2 36.2 93.4 

Net Benefit (%) 0.0 28.5 82.4 63.8 63.8 6.6 

No Impact (%) 100.0 0.0 0.0 0.0 0.0 0.0 

Design line 7 

Net Cost (%) 1.8 1.8 2.0 3.7 3.7 46.4 

Net Benefit (%) 98.2 98.2 98.0 96.3 96.3 53.6 

No Impact (%) 0.0 0.0 0.0 0.0 0.0 0.0 

Design line 8 

Net Cost (%) 5.2 5.2 15.3 10.5 78.5 78.5 

Net Benefit (%) 94.8 94.8 84.7 89.5 21.5 21.5 

No Impact (%) 0.0 0.0 0.0 0.0 0.0 0.0 

6. The first sentence on page 7365, column 1, paragraph 7 is corrected to read as 

follows: 

“At TSL 3, the average LCC impact ranges from $303 for design line 6 to 

$2,625 for design line 8. The median PBP ranges from 12.8 years for design line 6 to 4.7 

years for design line 7”. 

7. On pages 7379 and 7380, §431.196, the “%” headings in the second row of the 

tables in paragraphs (a)(1) and (a)(2) are corrected to read as “Efficiency (%)”.

6
 
 

 

 

8. On page 7380, §431.196, interchange the tables in paragraphs (b)(1) and (b)(2) 

to read as follows: 

(b) Liquid-Immersed Distribution Transformers. 

(1) The efficiency of a liquid-immersed distribution transformer manufactured on 

or after January 1, 2010, but before January 1, 2016, shall be no less than that required 

for their kVA rating in the table below. Liquid-immersed distribution transformers with 

kVA ratings not appearing in the table shall have their minimum efficiency level 

determined by linear interpolation of the kVA and efficiency values immediately above 

and below that kVA rating. 

Single-Phase Three-Phase 

kVA Efficiency (%) kVA Efficiency (%) 

10 98.62 15 98.36 

15 98.76 30 98.62 

25 98.91 45 98.76 

37.5 99.01 75 98.91 

50 99.08 112.5 99.01 

75 99.17 150 99.08 

100 99.23 225 99.17 

167 99.25 300 99.23 

250 99.32 500 99.25 

333 99.36 750 99.32 

500 99.42 1000 99.36 

667 99.46 1500 99.42 

833 99.49 2000 99.46 

2500 99.49 

Note: All efficiency values are at 50 percent of nameplate-rated load, determined 

according to the DOE Test- Procedure. 10 CFR Part 431, Subpart K, Appendix A. 

(2) The efficiency of a liquid-immersed distribution transformer manufactured on 

or after January 1, 2016, shall be no less than that required for their kVA rating in the 

table below. Liquid-immersed distribution transformers with kVA ratings not appearing 

7
 
 

in the table shall have their minimum efficiency level determined by linear interpolation 

of the kVA and efficiency values immediately above and below that kVA rating. 

Single-Phase Three-Phase 

kVA Efficiency (%) kVA Efficiency (%) 

10 98.70 15 98.65 

15 98.82 30 98.83 

25 98.95 45 98.92 

37.5 99.05 75 99.03 

50 99.11 112.5 99.11 

75 99.19 150 99.16 

100 99.25 225 99.23 

167 99.33 300 99.27 

250 99.39 500 99.35 

333 99.43 750 99.40 

500 99.49 1000 99.43 

667 99.52 1500 99.48 

833 99.55 2000 99.51 

2500 99.53 

Note: All efficiency values are at 50 percent of nameplate-rated load, determined 

according to the DOE Test- Procedure. 10 CFR Part 431, Subpart K, Appendix A. 

9. On pages 7380 and 7381, §431.196, interchange the tables in paragraphs (c)(1) 

and (c)(2) to read as follows: 

(c) Medium-Voltage Dry-Type Distribution Transformers. 

(1) The efficiency of a medium- voltage dry-type distribution transformer 

manufactured on or after January 1, 2010, but before January 1, 2016, shall be no less 

than that required for their kVA and BIL rating in the table below. Medium-voltage drytype distribution transformers with kVA ratings not appearing in the table shall have their 

8
 
 

minimum efficiency level determined by linear interpolation of the kVA and efficiency 

values immediately above and below that kVA rating. 

Single-Phase Three-Phase 

BIL* 20–45 kV 46–95 kV ≥96 kV BIL* 20–45 kV 46–95 kV ≥96 kV 

kVA Efficiency 

(%) 

Efficiency 

(%) 

Efficiency 

(%) kVA Efficiency (%) 

Efficiency 

(%) 

Efficiency 

(%) 

15 98.10 97.86 - 15 97.50 97.18 -

25 98.33 98.12 - 30 97.90 97.63 -

37.5 98.49 98.30 - 45 98.10 97.86 -

50 98.60 98.42 - 75 98.33 98.12 -

75 98.73 98.57 98.53 112.5 98.49 98.30 -

100 98.82 98.67 98.63 150 98.60 98.42 -

167 98.96 98.83 98.80 225 98.73 98.57 98.53 

250 99.07 98.95 98.91 300 98.82 98.67 98.63 

333 99.14 99.03 98.99 500 98.96 98.83 98.80 

500 99.22 99.12 99.09 750 99.07 98.95 98.91 

667 99.27 99.18 99.15 1000 99.14 99.03 98.99 

833 99.31 99.23 99.20 1500 99.22 99.12 99.09 

2000 99.27 99.18 99.15 

2500 99.31 99.23 99.20 

*BIL means basic impulse insulation level 

Note: All efficiency values are at 50 percent of nameplate rated load, determined according to 

the DOE Test- Procedure. 10 CFR Part 431, Subpart K, Appendix A. 

(2) The efficiency of a medium- voltage dry-type distribution transformer 

manufactured on or after January 1, 2016, shall be no less than that required for their 

kVA and BIL rating in the table below. Medium-voltage dry-type distribution 

transformers with kVA ratings not appearing in the table shall have their minimum 

efficiency level determined by linear interpolation of the kVA and efficiency values 

immediately above and below that kVA rating. 

Single-Phase Three-Phase 

BIL* 20–45 kV 46–95 kV ≥96 kV BIL* 20–45 kV 46–95 kV ≥96 kV 

kVA Efficiency 

(%) 

Efficiency 

(%) 

Efficiency 

(%) kVA Efficiency (%) 

Efficiency 

(%) 

Efficiency 

(%) 

9
 
15 98.10 97.86 - 15 97.50 97.18 - 25 98.33 98.12 - 30 97.90 97.63 - 37.5 98.49 98.30 - 45 98.10 97.86 -

50 98.60 98.42 - 75 98.33 98.13 - 75 98.73 98.57 98.53 112.5 98.52 98.36 -

100 98.82 98.67 98.63 150 98.65 98.5 1 -

167 98.96 98.83 98.80 225 98.82 98.69 98.57 

250 99.07 98.95 98.91 300 98.93 98.81 98.69 

333 99.14 99.03 98.99 500 99.09 98.99 98.89 

SOO 99.22 99.12 99.09 750 99.21 99.12 99.02 

667 99.27 99.18 99.15 1000 99.28 99.20 99. 11 

833 99.31 99.23 99.20 IS00 99.37 99.30 99.21 

2000 99.43 99.36 99.28 

2500 99.47 99.41 99.33 .. • BlL means basIc Impulse Insulation level 

Note: All efficiency values arc at 50 percent of nameplate rated load, determined according to 

the DOE Test- Procedure. 10 CFR Part 431, Subpart K, Appendix A. 

Issued in Washington, DC, on february 15,2012. 

Ka~.Hogan 

Deputy Assistant Secretary 

Energy Efficiency and Renewable Energy 

10