1 | Building Technologies Program eere.energy.gov

The Parker Ranch installation in Hawaii

BUILDING TECHNOLOGIES PROGRAM

Liquid-Immersed Distribution Transformers

Energy Conservation Program

Supplementary Analysis

James Raba

U.S. Department of Energy

Energy Efficiency & Renewable Energy

Jim.Raba@ee.doe.gov

June 20, 2012
2 | Building Technologies Program eere.energy.gov

Public Meeting Agenda

2

3

4

Background and Legal Authority

5

2 History

3 Added Equipment Classes, TSLs

4

1 Welcome, Opening Remarks

5

Scaling

Economic Results

6 Comments Sought
3 | Building Technologies Program eere.energy.gov

• Introductions

• Role of the Facilitator

• Ground Rules (norms)

– Listen as an ally

– Use short, succinct statements/keep to the point

– Hold sidebar conversations outside the room

– Focus on issues, not personalities

– One person speak at a time (raise hand to be recognized; state your 

name for the record)

– Set cell phones to silent/vibrate

• Housekeeping Items

• Agenda Review

• Opening Remarks

Welcome and Introduction
4 | Building Technologies Program eere.energy.gov

• Invite comment on new equipment classes and energy conservation 

levels for liquid-immersed distribution transformers. 

• Present methodologies and characterize results of the rulemaking 

analyses.

• Provide a forum for public discussion of rulemaking issues.

• Encourage interested parties to submit data, information, and written 

comments.

• Describe next steps in the rulemaking.

Purpose of the Public Meeting
5 | Building Technologies Program eere.energy.gov

• Participants are invited to provide summary comments or 

statements and raise additional issues for discussion.

• Comment period closes June 29, 2012.

Comments from Participants
6 | Building Technologies Program eere.energy.gov

• In all correspondence, please refer to the Distribution Transformers 

rulemaking by:

– Distribution Transformers Rulemaking,

– Docket Number EE–2010–BT–STD–0048, and

– Regulatory Identification Number (RIN) 1904–AC04 

• Email: DistributionTransformers-2010-STD-0048@ee.doe.gov 

• Comment period closes: June 29, 2012

Feedback Is Requested

Postal: Hand Delivery/Courier:

Ms. Brenda Edwards

U.S. Department of Energy

Building Technologies Program, Mailstop EE-2J

1000 Independence Avenue, SW

Washington, DC 20585-0121

Ms. Brenda Edwards

U.S. Department of Energy

Building Technologies Program, Suite 600

950 L’Enfant Plaza, SW

Washington, DC 20024

Tel: 202-586-2945
7 | Building Technologies Program eere.energy.gov

Public Meeting Agenda

2

3

4

Background and Legal Authority

5

2 History

3 Added Equipment Classes, TSLs

4

1 Welcome, Opening Remarks

5

Scaling

Economic Results

6 Comments Sought
8 | Building Technologies Program eere.energy.gov

Regulatory History

• EPACT 2005 set standards for low-voltage dry-type (LVDT) distribution transformers at the 

NEMA TP 1-2002 level.

• October 2007 – DOE issued a final rule establishing standards for liquid-immersed and 

medium-voltage dry-type (MVDT) distribution transformers. (72 FR 58190). DOE was sued 

on that rule concerning issues of environmental compliance. That suit was settled.

• As a result of the settlement agreement, compliance was required in 2010 with the standards 

established in 2007 final rule. However, DOE agreed to an expedited timeline to determine 

whether to amend standards for liquid-immersed and MVDT distribution transformers.

• DOE published a Notice of Proposed Rulemaking on February 10, 2012.

• Final Rule must be published by October 1, 2012, according to settlement agreement.
9 | Building Technologies Program eere.energy.gov

Distribution Transformers 

Rulemaking Schedule

2011 2012 2013 2014 2015 2016

Milestone Date

Issuance of NOPR February 1, 2012

Federal Register Notice of Public Meeting and Availability 

of the NOPR Technical Support Document February 10, 2012

Issue Final Rule October 1, 2012

Compliance Date January 1, 2016
10 | Building Technologies Program eere.energy.gov

Supplementary Analysis

• Many interested parties submitted written comment supporting new 

equipment classes for liquid-immersed distribution transformers

• Pole-mounted transformers

• Network- and vault-based transformers

• 200 kV BIL ratings

• In response, DOE provides supplementary analysis with several new trial 

standard levels (TSLs) and Equipment Classes (ECs) for liquid-immersed 

distribution transformers

• New TSLs, lettered “A” through “D,” provide separate standards for polemounted, network/vault-based, and 200 kV BIL ratings

• Supplementary analysis conducted with NOPR analysis data and tools

• No modifications have been made to any dry-type transformer classes
11 | Building Technologies Program eere.energy.gov

Public Meeting Agenda

2

3

4

Background and Legal Authority

5

2 History

3 Added Equipment Classes, TSLs

4

1 Welcome, Opening Remarks

5

Scaling

Economic Results

6 Comments Sought
12 | Building Technologies Program eere.energy.gov

Equipment Class Rationale

• Equipment classes carefully chosen

• Maximize energy savings

• Maintain equipment utility

• Minimize regulatory complexity

• Stakeholder support generally strong for new liquidimmersed equipment classes

• Separation of pole-mounted

• Separation of network- and vault-based

• Separation of 200 kV BIL
13 | Building Technologies Program eere.energy.gov

Equipment Class Rationale

• Network- and Vault-based Transformers

• In concrete vaults of fixed size and great enlargement cost

• ~90% of market already using H0, the highest possible grade 

for stacked core construction

• Usual option to use better grade not available

• Increasing transformer size only path to higher efficiency

• Market size ~5% by kVA

• 200 kV BIL Transformers

• High BIL ratings protect against voltage transients

• Reduce ability to reach higher efficiency

• Precedent in DOE’s treatment of MVDTs

• Market size ~1% by KVA
14 | Building Technologies Program eere.energy.gov

Equipment Class Structure

EC Phase Type

1 1 All

2 3 All

EC Phase Type

1a 1 All other

1b 1 Pole

1c 1 N/V

1d 1 200 kV

2a 3 All other

2b 3 Pole

2c 3 N/V

2d 3 200 kV

Note: “All other” refers to what had been “pad-mounted” in the supplementary analysis 

and includes any transformers not meeting other definitions
15 | Building Technologies Program eere.energy.gov

Design Line Implication

Equipment Class 

1A

Equipment Class 

1B

kVA All Other Pole Mount

10

15

25

37.5

50

75

100

167

250

333

500

667

833

Liquid-immersed, Single-phase DL 1

DL 2 DL 3

Rep Unit

Rep Unit

Rep Unit

Equipment Class 

2A Equipment Class 2B

kVA All Other Pole Mount

15

20

45

75

112.5

150

225

300

500

750

1000

1500

2000

2500

Liquid-immersed, Three-phase DL 4 DL 5

Scaled from DL2

Scaled 

from DL3

Rep Unit

Rep Unit
16 | Building Technologies Program eere.energy.gov

Trial Standard Levels

EC DL Phase Type Trial Standard Levels by Efficiency Level

1 A B C D

1A 1 1 all other EL 1 EL 1 EL 1.5 EL 2 EL 2

1B 2 1 pole EL 0 EL 0.5 EL 0.5 EL 2 EL 1

1B 3 1 pole EL 1 EL 1 EL 1 EL 2 EL 1

2A 4 3 all other EL 1 EL 1 EL 1.5 EL 2 EL 2

2A 5 3 all other EL 1 EL 1 EL 1.5 EL 2 EL 2

2B - 3 pole - scaled scaled scaled scaled

1C - 1 network/

vault - EL 0 EL 0 EL 0 EL 0

1D - 1 ≥ 200 kV 

BIL - EL 0 EL 0 EL 0 EL 0

2C - 3 network/

vault - EL 0 EL 0 EL 0 EL 0

2D - 3 ≥ 200 kV 

BIL - EL 0 EL 0 EL 0 EL 0

• DOE has added four new TSLs
17 | Building Technologies Program eere.energy.gov

Loss Table

DL EC Phase kVA Type 0 1 2 3 4 5 6 7 A B C D

1 1a 1 50 All 0 1 1 1 2 3 4 6 1 1.5 2 2

2 1b 1 25 Pole 0 0 1 1 2 3 4 6 0.5 0.5 2 1

3 1b 1 500 Pole 0 1 1 2 4 3 5 7 1 1 2 1

4 2a 3 150 All 0 1 1 1 2 3 5 7 1 1.5 2 2

5 2a 3 1500 All 0 1 1 2 4 3 4 6 1 1.5 2 2

1 1a 1 50 All 99.08% 99.16% 99.16% 99.16% 99.22% 99.25% 99.31% 99.50% 99.16% 99.19% 99.22% 99.22%

2 1b 1 25 Pole 98.91% 98.91% 99.00% 99.00% 99.07% 99.11% 99.18% 99.41% 98.95% 98.95% 99.07% 99.00%

3 1b 1 500 Pole 99.42% 99.48% 99.48% 99.51% 99.57% 99.54% 99.61% 99.73% 99.48% 99.48% 99.51% 99.50%

4 2a 3 150 All 99.08% 99.16% 99.16% 99.16% 99.22% 99.25% 99.31% 99.60% 99.16% 99.19% 99.22% 99.22%

5 2a 3 1500 All 99.42% 99.48% 99.48% 99.51% 99.57% 99.54% 99.61% 99.69% 99.48% 99.49% 99.51% 99.51%

1 1a 1 50 All 232 212 212 212 197 189 174 126 212 204 197 197

2 1b 1 25 Pole 138 138 126 126 117 112 103 74 133 133 117 126

3 1b 1 500 Pole 1458 1307 1307 1231 1080 1155 979 677 1307 1307 1231 1256

4 2a 3 150 All 696 635 635 635 590 567 521 301 635 612 590 590

5 2a 3 1500 All 4375 3920 3920 3693 3239 3466 2936 2332 3920 3807 3693 3693

1 1a 1 50 All 0% 9% 9% 9% 15% 19% 25% 46% 9% 12% 15% 15%

2 1b 1 25 Pole 0% 0% 8% 8% 15% 19% 25% 46% 4% 4% 15% 8%

3 1b 1 500 Pole 0% 10% 10% 16% 26% 21% 33% 54% 10% 10% 16% 14%

4 2a 3 150 All 0% 9% 9% 9% 15% 19% 25% 57% 9% 12% 15% 15%

5 2a 3 1500 All 0% 10% 10% 16% 26% 21% 33% 47% 10% 13% 16% 16%

TSL

Efficiency

Loss (W)

% Loss Reduction

EL
18 | Building Technologies Program eere.energy.gov

Public Meeting Agenda

2

3

4

Background and Legal Authority

5

2 History

3 Added Equipment Classes, TSLs

4

1 Welcome, Opening Remarks

5

Scaling

Economic Results

6 Comments Sought
19 | Building Technologies Program eere.energy.gov

Scaling

• TSLs contain efficiency levels for representative units

• DOE scales TSL values to kVA ratings not directly 

analyzed

• Most equipment classes (ECs) have at least two 

representative units

• In these cases standard derived by fitting a line in 

logarithmic space (log Loss vs log kVA)

• For ECs with a single point, several options exist
20 | Building Technologies Program eere.energy.gov

Scaling

• Two Scaling Points

• Class 1B (single-phase, pole-mounted)

• Generated using Design Lines 2 and 3

• Class 2A (three-phase, all other)

• Generated using Design Lines 4 and 5

• Class 2B (three-phase, pole-mounted)

• Scaled from 1B, using phase harmonization

• One Scaling Point

• Class 1A (single-phase, all other)

• Generated using Design Line 1
21 | Building Technologies Program eere.energy.gov

EC 1 – TSL B (Parallel)

pole

pole

pad
22 | Building Technologies Program eere.energy.gov

EC 1 – TSL B (Converging)

pole

pole

pad
23 | Building Technologies Program eere.energy.gov

TSL Plots – EC 1a

EC 1a - Efficiency vs Log kVA 

99.60% 

99.40% +_-------1---+_-_+-+-f-+_+++_----c 

99.20% +--------1---+----I:""q;..-; 'n 

99.00% +_---y$""--:oi"-="..'---: _7'9---+-r_+_+++------r_--+_-_+-+-r_+_+_H 

98.80% "h,L ,L-->''---+_--+-__+-_+-+_++++-----+_--+-__+-_+-+_+++_I 

98.60% +--------"----"-----"----'--'----"---'---'--+------'------"-----"----'--'----"---'---'--j 

10 100 

Log kVA 

1000 

Base li ne 

-a-TSLO 

TSL( 

-t-TSL D 

TSLl 
24 | Building Technologies Program eere.energy.gov

TSL Plots – EC 1b

EC lb - Efficiency vs Log kVA 

99.60% 

99.40% t----I---t-1-t-f-t++t--:::::~:::::~;;: 

99.20% +--------1---+---+---:~"--I7''f 

99.00% +----7''''j- -jIIc--:i''7'9---+-r--+-+++------r----+---+-+-r--+-+-H 

98.80% +- --." ,;L-+----+--+--f-+--+---1---1-+-----+----+--+--f-+--+---1---1-1 

98.60% +--------"----"-----"----'--'----"---'---'--+------'------"-----"----'--'----"---'---'--j 

10 100 

Log kVA 

1000 

Base li ne 

-a-TSLO 

TSl( 

-t-TSl D 

TSLl 
25 | Building Technologies Program eere.energy.gov

TSL Plots – EC 2a

EC 2a - Efficiency vs Log kVA 

99.50% I 

~ ~ 99.30% 

....... 

I 

99.10% 

98.90% 

98.70% 

98.50% 

;"' ~ '/ 

V :/ [,(/1 ~ 

~ //1 

f I 

98.30% I I I 

10 100 

Log kVA 

I 

.-- ~ 

1000 

Base li ne 

-a-TSLO 

TSL( 

-t-TSL D 

TSLl 
26 | Building Technologies Program eere.energy.gov

TSL Plots – EC 2b

EC 2b - Efficiency vs Log kVA 

99.50% +------j--+-+-f-+-+-H+--------j---j-+++++-I-= 

99.30% +------j--+-+-f-+-+-H+--------c7' 

99.10% +------j--+-+-f-+-+-b"''-j,,9''7 

98.90% 

98.70% +----,t'-;A----,>'-_fl'---,I'I--f-+-+-H+--------j---j-+++++-I---------1 

98.50% r---:r---jr--+-+-r--rrH+---------j----j-++++-H---------1 

98.30% +-___ ---" __ --"-_--"-_'---"---"---LJ+ ______ ---"_---"_-"----"---"--'---'-I ______ ----' 

10 100 1000 

Log kVA 

Base li ne 

_ TSLA 

-a-TSLO 

TSl( 

-t-TSl D 

TSLl 
27 | Building Technologies Program eere.energy.gov

Standards Tables – TSL A

EC 1a 1b 2a 2b

Type LI, all other LI, pole-mounted LI, all other LI, pole-mounted

Phase 1 1 3 3

BIL - - - -

10 98.78% 10 98.70% 15 98.65% 15 98.47%

15 98.89% 15 98.82% 30 98.83% 30 98.70%

25 99.01% 25 98.95% 45 98.92% 45 98.82%

37.5 99.10% 37.5 99.05% 75 99.03% 75 98.95%

50 99.16% 50 99.11% 112.5 99.11% 112.5 99.05%

75 99.24% 75 99.19% 150 99.16% 150 99.11%

100 99.29% 100 99.24% 225 99.23% 225 99.19%

167 99.37% 167 99.33% 300 99.27% 300 99.24%

250 99.42% 250 99.39% 500 99.35% 500 99.33%

333 99.46% 333 99.43% 750 99.40% 750 99.39%

500 99.51% 500 99.48% 1000 99.43% 1000 99.43%

667 99.54% 667 99.51% 1500 99.48% 1500 99.48%

833 99.57% 833 99.54% 2000 99.51% 2000 99.51%

2500 99.53% 2500 99.54%

TSL A
28 | Building Technologies Program eere.energy.gov

Standards Tables – TSL B

EC 1a 1b 2a 2b

Type LI, all other LI, pole-mounted LI, all other LI, pole-mounted

Phase 1 1 3 3

BIL - - - -

10 98.82% 10 98.70% 15 98.70% 15 98.47%

15 98.93% 15 98.82% 30 98.87% 30 98.70%

25 99.05% 25 98.95% 45 98.96% 45 98.82%

37.5 99.13% 37.5 99.05% 75 99.07% 75 98.95%

50 99.19% 50 99.11% 112.5 99.14% 112.5 99.05%

75 99.26% 75 99.19% 150 99.19% 150 99.11%

100 99.31% 100 99.24% 225 99.25% 225 99.19%

167 99.39% 167 99.33% 300 99.30% 300 99.24%

250 99.44% 250 99.39% 500 99.37% 500 99.33%

333 99.48% 333 99.43% 750 99.42% 750 99.39%

500 99.53% 500 99.48% 1000 99.45% 1000 99.43%

667 99.56% 667 99.51% 1500 99.49% 1500 99.48%

833 99.58% 833 99.54% 2000 99.52% 2000 99.51%

2500 99.55% 2500 99.54%

TSL B
29 | Building Technologies Program eere.energy.gov

Standards Tables – TSL C

EC 1a 1b 2a 2b

Type LI, all other LI, pole-mounted LI, all other LI, pole-mounted

Phase 1 1 3 3

BIL - - - -

10 98.90% 10 98.87% 15 98.76% 15 98.69%

15 98.99% 15 98.96% 30 98.92% 30 98.87%

25 99.10% 25 99.07% 45 99.01% 45 98.96%

37.5 99.17% 37.5 99.15% 75 99.10% 75 99.07%

50 99.22% 50 99.20% 112.5 99.17% 112.5 99.15%

75 99.28% 75 99.26% 150 99.22% 150 99.20%

100 99.33% 100 99.31% 225 99.28% 225 99.26%

167 99.40% 167 99.38% 300 99.32% 300 99.31%

250 99.45% 250 99.43% 500 99.39% 500 99.38%

333 99.48% 333 99.47% 750 99.44% 750 99.43%

500 99.52% 500 99.51% 1000 99.47% 1000 99.47%

667 99.55% 667 99.54% 1500 99.51% 1500 99.51%

833 99.57% 833 99.56% 2000 99.54% 2000 99.54%

2500 99.56% 2500 99.56%

TSL C
30 | Building Technologies Program eere.energy.gov

Standards Tables – TSL D

EC 1a 1b 2a 2b

Type LI, all other LI, pole-mounted LI, all other LI, pole-mounted

Phase 1 1 3 3

BIL - - - -

10 98.87% 10 98.76% 15 98.76% 15 98.55%

15 98.97% 15 98.87% 30 98.92% 30 98.76%

25 99.08% 25 99.00% 45 99.01% 45 98.87%

37.5 99.17% 37.5 99.09% 75 99.10% 75 99.00%

50 99.22% 50 99.15% 112.5 99.17% 112.5 99.09%

75 99.29% 75 99.22% 150 99.22% 150 99.15%

100 99.34% 100 99.27% 225 99.28% 225 99.22%

167 99.41% 167 99.36% 300 99.32% 300 99.27%

250 99.46% 250 99.41% 500 99.39% 500 99.36%

333 99.50% 333 99.45% 750 99.44% 750 99.41%

500 99.54% 500 99.50% 1000 99.47% 1000 99.45%

667 99.57% 667 99.53% 1500 99.51% 1500 99.50%

833 99.59% 833 99.56% 2000 99.54% 2000 99.53%

2500 99.56% 2500 99.56%

TSL D
31 | Building Technologies Program eere.energy.gov

Public Meeting Agenda

2

3

4

Background and Legal Authority

5

2 History

3 Added Equipment Classes, TSLs

4

1 Welcome, Opening Remarks

5

Scaling

Economic Results

6 Comments Sought
32 | Building Technologies Program eere.energy.gov

Economic Results: LCC & PBP Results

Equipment Class 1A – Design Line 1, 50 kVA, 1Φ

Efficiency Level

1 1.5 2 3 4 5 6

Efficiency (%) 99.16 99.19 99.22 99.25 99.31 99.42 99.5

Transformers with Net Increase in LCC (%) 57.94 36.3 4.77 4.77 8 13.63 55.36

Transformers with No Impact on LCC (%) 0.23 0.1 0.23 0.23 0 0 0

Transformers with Net LCC Savings (%) 41.83 63.6 95 95 92 86.37 44.64

Mean LCC Savings ($) 36 305 641 641 532 629 50

Median LCC Savings ($) -64 44 650 650 540 563 -104

Efficiency Level

1 1.5 2 3 4 5 6

Mean Payback (Years) 32.2 21.1 8.2 8.2 10.4 12 19.9

Median Payback (Years) 20.2 17.9 7.9 7.9 10 11.5 19.2

Transformers having Well Defined Payback (%) 85.02 89.4 99.77 99.77 99.89 99.99 99.95

Transformers having Undefined Payback (%) 14.98 10.6 0.23 0.23 0.11 0.01 0.05

Mean Retail Cost ($) 2,244 2,240 2,446 2,446 2,549 2,802 3,333

Mean Installation Costs ($) 2,230 2,229 2,271 2,271 2,344 2,415 2,606

Mean Operating Costs ($) 209 218 156 156 153 132 126

Mean Incremental First Cost ($) 327 327 569 569 746 1,070 1,792

Mean Operating Cost Savings ($) 18 21 71 71 74 95 100

Payback of Average Transformer 18.2 15.8 8 8 10.1 11.2 17.8

Life-Cycle Cost Results

Payback Period Results

Proposed Standard New Efficiency Level
33 | Building Technologies Program eere.energy.gov

Economic Results: LCC & PBP Results

Equipment Class 1B – Design Line 2, 25 kVA, 1Φ, Pole-mount

Efficiency Level

0.5 1 2 3 4 5 6 7

Efficiency (%) 98.95 99 99.07 99.11 99.18 99.31 99.41 99.46

Transformers with Net LCC Cost (%) 42.8 14.23 9.82 11.2 15.75 58.18 80.16 86.51

Transformers with No Change in LCC (%) 3.7 0 0 0 0 0 0 0

Transformers with Net LCC Benefit (%) 53.5 85.77 90.18 88.8 84.25 41.82 19.84 13.49

Mean LCC Savings ($) 54 309 338 300 250 -445 -736 -599

Median LCC Savings ($) 20 322 341 308 262 -91 -390 -535

Efficiency Level

0.5 1 2 3 4 5 6 7

Mean Payback (Years) 18.3 10 9.7 11.3 13.4 27.9 32.7 30.3

Median Payback (Years) 6.47 6.9 8 9.5 11.5 18.7 24.3 26.3

Transformers having Well Defined Payback (%) 72 98.55 99.93 99.71 99.83 99.75 99.77 99.9

Transformers having Undefined Payback (%) 28 1.45 0.07 0.29 0.17 0.25 0.23 0.1

Mean Retail Cost ($) 1,281 1,437 1,480 1,530 1,598 1,846 2,052 2,577

Mean Installation Costs ($) 1635 1722 1761 1790 1859 2500 2678 2093

Mean Operating Costs ($) 146 101 95 93 89 79 75 71

Mean Incremental First Cost ($) 140 235 317 396 533 1,422 1,807 1,746

Mean Operating Cost Savings ($) 66 34 40 41 46 55 60 64

Payback of Average Transformer 2.1 7 8 9.6 11.7 25.8 30.2 27.4

Life-Cycle Cost Results

Payback Period Results
34 | Building Technologies Program eere.energy.gov

Economic Results: LCC & PBP Results

Equipment Class 1B – Design Line 3, 500 kVA, 1Φ, Pole-mount

Efficiency Level

1 1.5 2 3 4 5 6 7

Efficiency (%) 99.48 99.5 99.51 99.54 99.57 99.61 99.69 99.73

Transformers with Net Increase in LCC (%) 16.07 13.44 11.86 5.35 3.87 3.65 7.37 24.82

Transformers with No Impact on LCC (%) 0.35 0.35 0.3 0 0 0 0 0

Transformers with Net LCC Savings (%) 83.58 86.21 87.84 94.65 96.13 96.35 92.63 75.18

Mean LCC Savings ($) 2370 2777 3809 5218 5586 6576 6924 4294

Median LCC Savings ($) 1751 2082 3652 5269 5607 6631 6587 3421

Efficiency Level

1 1.5 2 3 4 5 6 7

Mean Payback (Years) 9.2 8.2 6.7 5.6 5.4 6 9.4 15.2

Median Payback (Years) 6.1 6.4 4 4.6 4.7 5.2 8.1 13.3

Transformers having Well Defined Payback (%) 95.56 97.14 97.38 99.89 99.98 100 99.94 99.74

Transformers having Undefined Payback (%) 4.44 2.86 2.62 0.11 0.02 0 0.06 0.26

Mean Retail Cost ($) 8,546 8,718 8,944 9,534 9,679 10,280 12,500 15,917

Mean Installation Costs ($) 4,334 4,374 4,311 4,370 4,402 4,523 4,996 5,732

Mean Operating Costs ($) 1,222 1,184 1,104 984 957 872 724 656

Mean Incremental First Cost ($) 948 1,161 1,323 1,972 2,149 2,871 5,564 9,717

Mean Operating Cost Savings ($) 200 238 318 438 465 550 698 766

Payback of Average Transformer 4.7 4.9 4.2 4.5 4.6 5.2 8 12.7

Life-Cycle Cost Results

Payback Period Results

•To address the pole replacement 

costs for DL3 DOE used the same 

pole replacement methodology that 

was used for DL2.

•RSMeans 2011 was used to 

estimate the range of appropriate 

installation costs for the heavier 

representative unit to include the 

use of a heavier crane, and 

additional crew. 

•The estimated range of installation 

costs associated with pole 

replacement was increased to 

between $5,877 and $7,935

•The weight change-out threshold 

was increased by scaling the 150 

pounds use for DL2 with the 0.75 

scaling rule to 1,418 pounds for 

DL3.
35 | Building Technologies Program eere.energy.gov

Economic Results: LCC & PBP Results

Equipment Class 2A – Design Line 4, 150 kVA, 3Φ

Efficiency Level

1 1.5 2 3 4 5 6 7

Efficiency (%) 99.16 99.19 99.22 99.25 99.31 99.42 99.5 99.6

Transformers with Net LCC Cost (%) 5.95 12.62 1.91 1.91 1.86 1.82 4.87 31.1

Transformers with No Change in LCC (%) 0.58 0.62 0.58 0.58 0.58 0.17 0 0

Transformers with Net LCC Benefit (%) 93.47 86.76 97.51 97.51 97.56 98.01 95.13 63.87

Mean LCC Savings ($) 862 857 3356 3356 3362.3 3437.2 3193 1274

Median LCC Savings ($) 670 577 3418.7 3418.7 3423.6 3489.8 3054 956

Efficiency Level

1 1.5 2 3 4 5 6 7

Mean Payback (Years) 6.6 9.4 4.4 4.4 4.4 4.6 8.2 15.1

Median Payback (Years) 5 7.2 4.1 4.1 4.1 4.3 7.9 14.6

Transformers having Well Defined Payback (%) 99.37 99.38% 99.27 99.27 99.33 99.81 99.94 94.96

Transformers having Undefined Payback (%) 0.63 0.62% 0.73 0.73 0.67 0.19 0.06 0.01

Mean Retail Cost ($) 5,894 5,892 6,443 6,443 6,451 6,536 7,615 10,601

Mean Installation Costs ($) 4,090 4,095 4,184 4,184 4,183 4,223 4,584 4,709

Mean Operating Costs ($) 668 420 483 483 482 471 400 334

Mean Incremental First Cost ($) 438 440 1,081 1,081 1,088 1,214 2,653 5,763

Mean Operating Cost Savings ($) 76 74 261 261 262 274 344 414

Payback of Average Transformer 5.7 6.0 4.1 4.1 4.1 4.4 7.7 13.9

Life-Cycle Cost Results

Payback Period Results
36 | Building Technologies Program eere.energy.gov

Economic Results: LCC & PBP Results

Equipment Class 2A – Design Line 5, 1500 kVA, 3Φ

Efficiency Level

1 1.5 2 3 4 5 6

Efficiency (%) 99.48 99.5 99.51 99.54 99.57 99.61 99.69

Transformers with Net Increase in LCC (%) 19.05 16.99 13.15 10.41 7.77 7.88 39.92

Transformers with No Impact on LCC (%) 0.39 0.28 0.09 0.01 0 0 0

Transformers with Net LCC Savings (%) 80.56 82.73 86.76 89.58 92.23 92.12 60.08

Mean LCC Savings ($) 7,787 9,010 10,288 11,395 12,513 12,746 3,626

Median LCC Savings ($) 8,300 9,649 10,741 11,658 12,666 12,838 3,083

Efficiency Level

1 1.5 2 3 4 5 6

Mean Payback (Years) 7 7.3 6.5 7.8 7.8 9.7 18.7

Median Payback (Years) 4 4.1 4.2 5.7 6.3 8.3 16.9

Transformers having Well Defined Payback (%) 91.63 89.93 96.04 98.89 99.82 99.97 100

Transformers having Undefined Payback (%) 8.37 10.07 3.96 1.11 0.18 0.03 0

Mean Retail Cost ($) 28,574 28,675 29,040 30,872 31,980 35,448 56,798

Mean Installation Costs ($) 8,551 8,589 8,631 8,875 9,030 9,498 9,834

Mean Operating Costs ($) 3,407 3,721 3,259 3,105 2,994 2,802 2,185

Mean Incremental First Cost ($) 3,296 3,434 3,842 5,918 7,181 11,116 32,803

Mean Operating Cost Savings ($) 718 693 866 1,020 1,131 1,323 1,940

Payback of Average Transformer 4.6 5.0 4.4 5.8 6.3 8.4 16.9

Life-Cycle Cost Results

Payback Period Results
37 | Building Technologies Program eere.energy.gov

Economic Results: NIA Results

Liquid-immersed Equipment Classes as presented in the NOPR

TSL NOPM TSL

Base 1 2 3 4 5 6 7 A B C D

Transformer Shipments 2015-2044 (Billion KVA) 1.95 1.95 1.95 1.95 1.94 1.94 1.94 1.91 1.95 1.95 1.95 1.95

Equipment Cost ($Billions) 32.28 1.26 2.51 2.61 4.26 4.48 6.32 19.88 1.57 2 3.72 3.28

Operating Cost (Savings in TSLs) ($Billions) 23.26 2.01 4.03 4.33 7.22 7.13 8.08 11.64 2.5 3.21 6.71 6.28

Cumulative Source Savings 2044 (Quads) 0.36 0.74 0.82 1.44 1.42 1.7 2.7 0.45 0.6 1.3 1.20

Net Present Value at 3% Discount Rate ($Billions) 3.66 7.39 8.24 14.21 13.48 13.17 -1.11 4.66 6.04 13.51 12.93

Net Present Value at 7% Discount Rate ($Billions) 0.75 1.51 1.73 2.96 2.65 1.76 -8.25 0.93 1.21 2.99 3.00

TSL NOPM TSL

Base 1 2 3 4 5 6 7 A B C D

Transformer Shipments 2015-2044 (Billion KVA) 0.80 0.80 0.80 0.80 0.80 0.80 0.80 0.79 0.80 0.80 0.80 0.80

Equipment Cost ($Billions) 22.36 0.52 1.78 1.79 2.61 3.03 4.05 12.11 0.84 1.13 2.6 2.16

Operating Cost (Savings in TSLs) ($Billions) 11.37 0.34 2.36 2.38 3.76 3.89 4.23 5.84 0.78 1.23 3.69 3.26

Cumulative Source Savings 2044 (Quads) 0.09 0.47 0.47 0.75 0.8 0.9 1.37 0.18 0.27 0.75 0.65

Net Present Value at 3% Discount Rate ($Billions) 0.13 3.87 3.93 6.64 6.28 5.51 -4.64 0.94 1.78 6.44 5.86

Net Present Value at 7% Discount Rate ($Billions) -0.19 0.58 0.6 1.15 0.85 0.19 -6.27 -0.06 0.1 1.09 1.10

TSL NOPM TSL

Base 1 2 3 4 5 6 7 A B C D

Transformer Shipments 2015-2044 (Billion KVA) 1.15 1.15 1.15 1.15 1.15 1.15 1.14 1.13 1.15 1.15 1.15 1.15

Equipment Cost ($Billions) 9.92 0.73 0.73 0.82 1.65 1.45 2.27 7.78 0.73 0.87 1.12 1.12

Operating Cost (Savings in TSLs) ($Billions) 11.88 1.67 1.67 1.95 3.46 3.25 3.84 5.8 1.72 1.98 3.01 3.01

Cumulative Source Savings 2044 (Quads) 0.27 0.27 0.35 0.69 0.63 0.8 1.33 0.27 0.33 0.55 0.55

Net Present Value at 3% Discount Rate ($Billions) 3.53 3.53 4.31 7.57 7.21 7.66 3.53 3.71 4.26 7.07 7.07

Net Present Value at 7% Discount Rate ($Billions) 0.94 0.94 1.13 1.82 1.8 1.57 -1.98 0.99 1.11 1.9 1.90

Impacts for All Liquid-immersed Transformers

Impacts for Equipment Class 1

Impacts for Equipment Class 2

DOE has proposed 

TSL 1 as the standard
38 | Building Technologies Program eere.energy.gov

Economic Results: NIA Results

For Supplemental 1Φ Liquid-immersed Equipment Classes

TSL NOPM TSL

Base 1 2 3 4 5 6 7 A B C D

Transformer Shipments 2015-2044 (Billion KVA) 0.24 0.24 0.24 0.24 0.24 0.24 0.24 0.24 0.24 0.24 0.24 0.24

Equipment Cost ($Billions) 6.71 0.16 0.53 0.54 0.78 0.91 1.21 3.63 0.25 0.34 0.78 0.65

Operating Cost (Savings in TSLs) ($Billions) 3.41 0.1 0.71 0.72 1.13 1.17 1.27 1.75 0.23 0.37 1.11 0.98

Cumulative Source Savings 2044 (Quads) 0.03 0.14 0.14 0.23 0.24 0.27 0.41 0.05 0.08 0.22 0.19

Net Present Value at 3% Discount Rate ($Billions) 0.04 1.16 1.18 1.99 1.88 1.65 -1.39 0.28 0.53 1.93 1.76

Net Present Value at 7% Discount Rate ($Billions) -0.06 0.17 0.18 0.34 0.26 0.06 -1.88 -0.02 0.03 0.33 0.33

TSL NOPM TSL

Base 1 2 3 4 5 6 7 A B C D

Transformer Shipments 2015-2044 (Billion KVA) 0.56 0.56 0.56 0.56 0.56 0.56 0.56 0.55 0.56 0.56 0.56 0.56

Equipment Cost ($Billions) 15.65 0.37 1.25 1.25 1.83 2.12 2.83 8.48 0.59 0.79 1.82 1.51

Operating Cost (Savings in TSLs) ($Billions) 7.96 0.24 1.65 1.67 2.63 2.72 2.96 4.09 0.55 0.86 2.58 2.28

Cumulative Source Savings 2044 (Quads) 0.07 0.33 0.33 0.53 0.56 0.63 0.96 0.13 0.19 0.52 0.45

Net Present Value at 3% Discount Rate ($Billions) 0.09 2.71 2.75 4.65 4.4 3.85 -3.25 0.66 1.24 4.51 4.10

Net Present Value at 7% Discount Rate ($Billions) -0.13 0.41 0.42 0.8 0.6 0.13 -4.39 -0.04 0.07 0.77 0.77

Impacts for Equipment Class 1A

Impacts for Equipment Class 1B – Pole Mounted Transformers

•To disaggregate the impacts for pad- and pole-mounted transformers from the equipment 

classes presented in the NOPR DOE associated the fraction of savings with the volume of 

capacity shipment for each of the new proposed equipment classes.

•DOE assumed 70% of single-phase liquid-immersed shipments by capacity are polemounted transformers

EC 1A: 30% EC 1B: 70%

0% 20% 40% 60% 80% 100%

EC 1
39 | Building Technologies Program eere.energy.gov

Economic Results: NIA Results

For Supplemental 3Φ Liquid-immersed Equipment Classes

TSL NOPM TSL

Base 1 2 3 4 5 6 7 A B C D

Transformer Shipments 2015-2044 (Billion KVA) 1.10 1.09 1.09 1.09 1.09 1.09 1.09 1.07 1.09 1.09 1.09 1.09

Equipment Cost ($Billions) 9.42 0.7 0.7 0.78 1.57 1.38 2.16 7.39 0.7 0.83 1.06 1.06

Operating Cost (Savings in TSLs) ($Billions) 11.29 1.58 1.58 1.85 3.29 3.08 3.65 5.51 1.64 1.88 2.86 2.86

Cumulative Source Savings 2044 (Quads) 0.26 0.26 0.33 0.65 0.6 0.76 1.26 0.26 0.31 0.53 0.53

Net Present Value at 3% Discount Rate ($Billions) 3.35 3.35 4.1 7.19 6.85 7.28 3.35 3.53 4.05 6.72 6.72

Net Present Value at 7% Discount Rate ($Billions) 0.89 0.89 1.07 1.72 1.71 1.49 -1.88 0.94 1.05 1.8 1.80

TSL NOPM TSL

Base 1 2 3 4 5 6 7 A B C D

Transformer Shipments 2015-2044 (Billion KVA) 0.060 0.06 0.06 0.06 0.06 0.06 0.06 0.06 0.06 0.06 0.06 0.06

Equipment Cost ($Billions) 0.5 0.04 0.04 0.04 0.08 0.07 0.11 0.39 0.04 0.04 0.06 0.06

Operating Cost (Savings in TSLs) ($Billions) 0.59 0.08 0.08 0.1 0.17 0.16 0.19 0.29 0.09 0.1 0.15 0.15

Cumulative Source Savings 2044 (Quads) 0.01 0.01 0.02 0.03 0.03 0.04 0.07 0.01 0.02 0.03 0.03

Net Present Value at 3% Discount Rate ($Billions) 0.18 0.18 0.22 0.38 0.36 0.38 0.18 0.19 0.21 0.35 0.35

Net Present Value at 7% Discount Rate ($Billions) 0.05 0.05 0.06 0.09 0.09 0.08 -0.1 0.05 0.06 0.09 0.09

Impacts for Equipment Class 2A

Impacts for Equipment Class 2B – Pole Mounted Transformers

•To disaggregate the impacts for pad- and pole-mounted transformers from the equipment 

classes presented in the NOPR DOE associated the fraction of savings with the volume of 

capacity shipment for each of the new proposed equipment classes.

•DOE assumed 5% of three-phase liquid-immersed shipments by capacity are polemounted transformers

EC 2A: 95% EC 2B: 5%

0% 20% 40% 60% 80% 100%

EC 2
40 | Building Technologies Program eere.energy.gov

Economic Results: NIA Results

Summary of Results for Supplemental TSL A

Summary of Key Results Proposed Rule vs. Supplemental TSLs

For All Liquid-Immersed Distribution Transformers: TSL A

• 0.45 quad of energy saved from 2016–2045

• Net increase of $0.93 billion in NPV at 7% discount rate and $4.66 billion at 3% discount

• For most equipment classes, the percentage of customers experiencing net benefit is greater than 60%

• Weight increase of between 4 and 10% for 1Φ pole-mounts, 9% for other 1Φ, < 5% for all 3Φ

• Volume increase 14% for 1Φ pole-mounts greater than 500 kVA, < 5% for all other 1Φ and 3Φ transformers

• Footprint increase 11% for 1Φ pole-mounts greater than 500 kVA, < 5% for all other 1Φ and 3Φ transformers

• Results are based LCC samples of transformers with the following core steels:

• DL1: 88% M3; DL2: 90% M2; DL3: 40%/40% M3/SA1; DL4: 55%/35% ZDMH/M2; DL5 95% SA1

Equipment 

Class

Cumulative Source Savings 2044 

(Quads)

Net Present Value at 3% Discount 

Rate ($Billions) 

Net Present Value at 7% Discount 

Rate ($Billions) 

TSL TSL TSL 

1 A B C D 1 A B C D 1 A B C D

EC 1 + EC 2 0.36 0.45 0.60 1.30 1.20 3.66 4.66 6.04 13.51 12.93 0.75 0.93 1.21 2.99 3.00

EC 1 0.09 0.18 0.27 0.75 0.65 0.13 0.94 1.78 6.44 5.86 -0.19 -0.06 0.1 1.09 1.10

EC 1A 0.03 0.05 0.08 0.22 0.19 0.04 0.28 0.53 1.93 1.76 -0.06 -0.02 0.03 0.33 0.33

EC 1B 0.07 0.13 0.19 0.52 0.45 0.09 0.66 1.24 4.51 4.10 -0.13 -0.04 0.07 0.77 0.77

EC 2 0.27 0.27 0.33 0.55 0.55 3.53 3.71 4.26 7.07 7.07 0.94 0.99 1.11 1.90 1.90

EC 2A 0.26 0.26 0.31 0.53 0.53 3.35 3.53 4.05 6.72 6.72 0.89 0.94 1.05 1.80 1.80

EC 2B 0.01 0.01 0.02 0.03 0.03 0.18 0.19 0.21 0.35 0.35 0.05 0.05 0.06 0.09 0.09
41 | Building Technologies Program eere.energy.gov

Economic Results: NIA Results

Summary of Results for Supplemental TSL B

Summary of Key Results Proposed Rule vs. Supplemental TSLs

For All Liquid-Immersed Distribution Transformers: TSL B

• 0.6 quad of energy saved from 2016–2045

• Net increase of $1.21 billion in NPV at 7% discount rate and $6.04 billion at 3% discount

• For most equipment classes, the percentage of customers experiencing net benefit is greater than 80%

• Weight increase of between 4 and 10% for 1Φ pole-mounts,14% for other 1Φ, < 5% for all 3Φ

• Volume increase 14% for 1Φ pole-mounts greater than 500 kVA and <5% for smaller capacity pole-mounts, 10 % for 

all other 1Φ , and < 5% for all 3Φ transformers

• Footprint increase 11% for 1Φ pole-mounts greater than 500 kVA and <5% for smaller capacity pole-mounts, 10 % 

for all other 1Φ , and < 5% for all 3Φ transformers

• Results are based LCC samples of transformers with the following core steels:

• DL1: 49%/46% SA1/M3; DL2: 90% M2; DL3: 40%/40% M3/SA1; DL4: 88%/11% ZDMH/SA1; DL5 100% SA1

Equipment 

Class

Cumulative Source Savings 2044 

(Quads)

Net Present Value at 3% Discount 

Rate ($Billions) 

Net Present Value at 7% Discount 

Rate ($Billions) 

TSL TSL TSL 

1 A B C D 1 A B C D 1 A B C D

EC 1 + EC 2 0.36 0.45 0.60 1.30 1.20 3.66 4.66 6.04 13.51 12.93 0.75 0.93 1.21 2.99 3.00

EC 1 0.09 0.18 0.27 0.75 0.65 0.13 0.94 1.78 6.44 5.86 -0.19 -0.06 0.1 1.09 1.10

EC 1A 0.03 0.05 0.08 0.22 0.19 0.04 0.28 0.53 1.93 1.76 -0.06 -0.02 0.03 0.33 0.33

EC 1B 0.07 0.13 0.19 0.52 0.45 0.09 0.66 1.24 4.51 4.10 -0.13 -0.04 0.07 0.77 0.77

EC 2 0.27 0.27 0.33 0.55 0.55 3.53 3.71 4.26 7.07 7.07 0.94 0.99 1.11 1.90 1.90

EC 2A 0.26 0.26 0.31 0.53 0.53 3.35 3.53 4.05 6.72 6.72 0.89 0.94 1.05 1.80 1.80

EC 2B 0.01 0.01 0.02 0.03 0.03 0.18 0.19 0.21 0.35 0.35 0.05 0.05 0.06 0.09 0.09
42 | Building Technologies Program eere.energy.gov

Economic Results: NIA Results

Summary of Results for Supplemental TSL C

Summary of Key Results Proposed Rule vs. Supplemental TSLs

Equipment 

Class

Cumulative Source Savings 2044 

(Quads)

Net Present Value at 3% Discount 

Rate ($Billions) 

Net Present Value at 7% Discount 

Rate ($Billions) 

TSL TSL TSL 

1 A B C D 1 A B C D 1 A B C D

EC 1 + EC 2 0.36 0.45 0.60 1.30 1.20 3.66 4.66 6.04 13.51 12.93 0.75 0.93 1.21 2.99 3.00

EC 1 0.09 0.18 0.27 0.75 0.65 0.13 0.94 1.78 6.44 5.86 -0.19 -0.06 0.1 1.09 1.10

EC 1A 0.03 0.05 0.08 0.22 0.19 0.04 0.28 0.53 1.93 1.76 -0.06 -0.02 0.03 0.33 0.33

EC 1B 0.07 0.13 0.19 0.52 0.45 0.09 0.66 1.24 4.51 4.10 -0.13 -0.04 0.07 0.77 0.77

EC 2 0.27 0.27 0.33 0.55 0.55 3.53 3.71 4.26 7.07 7.07 0.94 0.99 1.11 1.90 1.90

EC 2A 0.26 0.26 0.31 0.53 0.53 3.35 3.53 4.05 6.72 6.72 0.89 0.94 1.05 1.80 1.80

EC 2B 0.01 0.01 0.02 0.03 0.03 0.18 0.19 0.21 0.35 0.35 0.05 0.05 0.06 0.09 0.09

For All Liquid-Immersed Distribution Transformers: TSL C

• 1.3 quads of energy saved from 2016–2045

• Net increase of $2.99 billion in NPV at 7% discount rate and $13.51 billion at 3% discount

• For most equipment classes, the percentage of customers experiencing net benefit is greater than 90%

• Weight increase between 6 and 18% for 1Φ pole-mounts,13% for other 1Φ, < 10% for all 3Φ

• Volume increase of 24% for 1Φ pole-mounts greater than 500 kVA and 20% for smaller capacity pole-mounts, 13 % 

for all other 1Φ , and < 10% for all 3Φ transformers

• Footprint increase 15% for 1Φ pole-mounts greater than 500 kVA and 7% for smaller capacity pole-mounts, 13 % 

for all other 1Φ , and < 10% for all 3Φ transformers

• Results are based LCC samples of transformers with the following core steels:

• DL1: 100% SA1; DL2: 100 SA1; DL3: 79%/20% SA1/M2; DL4: 100% SA1; DL5 100% SA1
43 | Building Technologies Program eere.energy.gov

Economic Results: NIA Results

Summary of Results for Supplemental TSL D

Summary of Key Results Proposed Rule vs. Supplemental TSLs

For All Liquid-Immersed Distribution Transformers: TSL D

• 1.2 quads of energy saved from 2016–2045

• Net increase of $12.93 billion in NPV at 7% discount rate and $3.00 billion at 3% discount

• For most equipment classes, the percentage of customers experiencing net benefit is greater than 90%

• Weight increase between 6 and 15% for 1Φ pole-mounts, 13% for other 1Φ, < 10% for all 3Φ

• Volume increase of 14% for 1Φ pole-mounts, 13 % for all other 1Φ , and < 10% for other 3Φ transformers

• Footprint increase 11% for 1Φ pole-mounts greater than 500 kVA and <5%% for smaller capacity pole-mounts, 13 % 

for all other 1Φ , and < 5% for other 3Φ transformers

• Results are based LCC samples of transformers with the following core steels:

• DL1: 100% SA1; DL2: 98% SA1; DL3: 42%/42%/12% SA1/M3/ZDMH; DL4: 100% SA1; DL5 100% SA1

Equipment 

Class

Cumulative Source Savings 2044 

(Quads)

Net Present Value at 3% Discount 

Rate ($Billions) 

Net Present Value at 7% Discount 

Rate ($Billions) 

TSL TSL TSL 

1 A B C D 1 A B C D 1 A B C D

EC 1 + EC 2 0.36 0.45 0.60 1.30 1.20 3.66 4.66 6.04 13.51 12.93 0.75 0.93 1.21 2.99 3.00

EC 1 0.09 0.18 0.27 0.75 0.65 0.13 0.94 1.78 6.44 5.86 -0.19 -0.06 0.1 1.09 1.10

EC 1A 0.03 0.05 0.08 0.22 0.19 0.04 0.28 0.53 1.93 1.76 -0.06 -0.02 0.03 0.33 0.33

EC 1B 0.07 0.13 0.19 0.52 0.45 0.09 0.66 1.24 4.51 4.10 -0.13 -0.04 0.07 0.77 0.77

EC 2 0.27 0.27 0.33 0.55 0.55 3.53 3.71 4.26 7.07 7.07 0.94 0.99 1.11 1.90 1.90

EC 2A 0.26 0.26 0.31 0.53 0.53 3.35 3.53 4.05 6.72 6.72 0.89 0.94 1.05 1.80 1.80

EC 2B 0.01 0.01 0.02 0.03 0.03 0.18 0.19 0.21 0.35 0.35 0.05 0.05 0.06 0.09 0.09
44 | Building Technologies Program eere.energy.gov

Public Meeting Agenda

2

3

4

Background and Legal Authority

5

2 History

3 Added Equipment Classes, TSLs

4

1 Welcome, Opening Remarks

5

Scaling

Economic Results

6 Comments Sought
45 | Building Technologies Program eere.energy.gov

Comments Sought

• DOE seeks comment on all aspects of the supplementary 

analysis and rulemaking at-large, but in particular on the following 

issues:

• New equipment classes

• Pole/Pad

• Network/Vault

• 200 kV BIL

• New TSLs

• Opportunity for Energy Savings

• Appropriateness of efficiency levels for each class

• Utility pole replacement costs

• Shipment data for all types
46 | Building Technologies Program eere.energy.gov

• In all correspondence, please refer to the Distribution Transformers 

rulemaking by:

– Distribution Transformers Rulemaking,

– Docket Number EE–2010–BT–STD–0048, and

– Regulatory Identification Number (RIN) 1904–AC04 

• Email: DistributionTransformers-2010-STD-0048@ee.doe.gov 

• Comment period closes: June 29, 2012

Feedback Is Requested

Postal: Hand Delivery/Courier:

Ms. Brenda Edwards

U.S. Department of Energy

Building Technologies Program, Mailstop EE-2J

1000 Independence Avenue, SW

Washington, DC 20585-0121

Ms. Brenda Edwards

U.S. Department of Energy

Building Technologies Program, Suite 600

950 L’Enfant Plaza, SW

Washington, DC 20024

Tel: 202-586-2945