This spreadsheet is from the proposed rulemaking, with the transcription error corrected in column C

Actual CAMD data

 Installation years

Avg of 01-08 34,152

final rule effective 

date of 1/1/2013

as reported in 

proposed rule, with 

transcription error

Step 1: with 

correction of 

transcription error

Step 2: PLUS with 

adjustment of final 

rule effective date 

to 12/31/13

Year

From proposal: 5-

yr BART as if LNB 

not yet installed

From Proposal 5 yr 

BART actual LNB 

install

5 yr BART actual 

LNB install

5 yr BART actual 

LNB install

install years by 2018 by 2018 by 2018 by 2018

2001 34,019 34,019 34,019 34,019

2002 35,569 35,569 35,569 35,569

2003 31,620 31,620 31,620 31,620

2004 33,986 33,986 33,986 33,986

2005 33,221 33,221 33,221 33,221

2006 34,744 34,744 34,744 34,744

2007 35,253 35,253 35,253 35,253

2008 34,803 34,803 34,803 34,803

2009 34,152 30,500 30,500 30,500

2010 34,152 24,427 24,427 24,427

2011 34,152 19,837 19,837 19,837

2012 34,152 23,325 23,325 23,325

2013 34,152 23,325 23,325 23,325

2014 34,152 23,325 23,325 23,325

2015 34,152 23,325 23,325 23,325

2016 34,152 23,325 23,325 23,325

2017 34,152 23,325 23,325 23,325

2018 5,345 5,343 5,345 23,325

2019 5,345 5,343 5,345 5,345

2020 5,345 5,343 5,345 5,345

2021 5,345 5,343 5,345 5,345

2022 5,345 5,343 5,345 5,345

2023 5,345 5,343 5,345 5,345

2024 5,345 5,343 5,345 5,345

2025 5,345 5,343 5,345 5,345

2026 5,345 5,343 5,345 5,345

2027 5,345 5,343 5,345 5,345

2028 5,345 5,343 5,345 5,345

2029 5,345 5,343 5,345 5,345

2030 5,345 5,343 5,345 5,345

2031 5,345 5,343 5,345 5,345

2032 5,345 5,343 5,345 5,345
2033 5,345 5,343 5,345 5,345

2034 5,345 5,343 5,345 5,345

2035 5,345 5,343 5,345 5,345

2036 5,345 5,343 5,345 5,345

2037 5,345 5,343 5,345 5,345

2038 5,345 5,343 5,345 5,345

2039 5,345 5,343 5,345 5,345

2040 5,345 5,343 5,345 5,345

2041 5,345 5,343 5,345 5,345

2042 5,345 5,343 5,345 5,345

2043 5,345 5,343 5,345 5,345

2044 5,345 5,343 5,345 5,345

sum (09-44) 451,689 358,974 359,028 377,008
Step 3: PLUS with 

LNB/SOFA credit

5-yr BART as if 

LNB not yet 

installed

by 2018

34,019

35,569

31,620

33,986

33,221

34,744

35,253

34,803

34,152

34,152

34,152

34,152

34,152

34,152

34,152

34,152

34,152

34,152

5,345

5,345

5,345

5,345

5,345

5,345

5,345

5,345

5,345

5,345

5,345

5,345

5,345

5,345
5,345

5,345

5,345

5,345

5,345

5,345

5,345

5,345

5,345

5,345

5,345

5,345

480,489
Year Total NOx (tons) Heat Input (MMBtu) Emission Rate

2001 34,019 191,638,695 0.355

2002 35,569 199,398,687 0.357

2003 31,620 183,478,417 0.345

2004 33,986 197,247,286 0.345

2005 33,221 191,786,039 0.346

2006 34,744 195,629,519 0.355

2007 35,253 196,676,299 0.358

2008 34,803 199,136,340 0.3495

2009 30,501 184,315,616 0.331

2010 24,427 173,473,615 0.282

2011 19,837 180,463,627 0.220

2012 16,468 164,966,570 0.200

2013 17,456 173,672,459 0.201

AVG (01-08) 34,152 194,373,910 0.351

AVG (01-03) 191,505,266

AVG (09-12) 175,804,857

AVG (09-13) 175,378,377

AVG (01-08) 0.351

AVG (01-12) 188,184,226

AVG (01-13) 187,067,936

0.108311715

18,995,533

0

50,000,000

100,000,000

150,000,000

200,000,000

250,000,000

2001
2001 2002 2003 2004 2005 2006 2007 2008 2009 2010 2011 2012 2013

Heat Input (MMBtu)
TWG used a different, but equivalent, method for applying the LNB/SOFA early installation credit compared to the metho

Example from Calculation in 2/5/13 Proposal, except that it does not propagate a transcription error in the original spreadshe

** Original spreadsheet inadvertantly, resulting from transcription error, used "5,343" instead of "5,345" in many cells

Avg of 01-08 34,152

Year

5-yr BART 

as if LNB 

not yet 

installed

5 yr BART 

actual 

LNB 

install

Alt 1

install years by 2018 by 2018 21/22/23

2001 34,019 34,019 34,019

2002 35,569 35,569 35,569

2003 31,620 31,620 31,620

2004 33,986 33,986 33,986

2005 33,221 33,221 33,221

2006 34,744 34,744 34,744

2007 35,253 35,253 35,253

2008 34,803 34,803 34,803

2009 34,152 30,500 30,501

2010 34,152 24,427 24,427

2011 34,152 19,837 19,837

2012 34,152 23,325 23,325

2013 34,152 23,325 23,325

2014 34,152 23,325 23,325

2015 34,152 23,325 23,325

2016 34,152 23,325 23,325

2017 34,152 23,325 23,325

2018 34,152 23,325 23,325

2019 5,345 5,345 23,325

2020 5,345 5,345 23,325

2021 5,345 5,345 17,332

2022 5,345 5,345 11,338

2023 5,345 5,345 5,345

2024 5,345 5,345 5,345

2025 5,345 5,345 5,345

2026 5,345 5,345 5,345

2027 5,345 5,345 5,345

2028 5,345 5,345 5,345

2029 5,345 5,345 5,345

2030 5,345 5,345 5,345

2031 5,345 5,345 5,345

2032 5,345 5,345 5,345

2033 5,345 5,345 5,345

2034 5,345 5,345 5,345

2035 5,345 5,345 5,345
2036 5,345 5,345 5,345

2037 5,345 5,345 5,345

2038 5,345 5,345 5,345

2039 5,345 5,345 5,345

2040 5,345 5,345 5,345

2041 5,345 5,345 5,345

2042 5,345 5,345 5,345

2043 5,345 5,345 5,345

2044 5,345 5,345 5,345

sum (09-44) 480,489 377,008 430,948

LNB credit 103,481

Adjusted Emissions with LNB Credit 327,467

EPA Method for Comparing Alternative to BART applied the LNB/SOFA Credit to the Alternative (via subtraction), such tha

Total 2009-2044 BART Emissions = 377,008

Adjsuted 2009-2044 Emissions from Alternative = 327,467

Emissions from Alternative are less than BART by: 49,541

TWG Method for Comparing Alternative to BART applied the LNB/SOFA Credit to the BART Threshold (cap) (via addition)* 

*(In other words, the BART Cap is calculated "as if" LNB/SOFA were not installed early at NGS and are installed concurrent

Total 2009-2044 BART Emissions = 480,489

Adjsuted 2009-2044 Emissions from Alternative = 430,948

Emissions from Alternative are less than BART by: 49,541

The resulting difference between BART and the Alternative to BART are equivalent using both methods.

Therefore, EPA's analysis of the TWG Alternatives in the following spreadsheets use the TWG Method and apply the LNB/S
redit compared to the method EPA used in the February 5, 2013 proposal

error in the original spreadsheet from 2/5/13 Proposal

of "5,345" in many cells
ve (via subtraction), such that

reshold (cap) (via addition)* instead of the Alternative, such that

 and are installed concurrently with new controls by BART compliance date)

Method and apply the LNB/SOFA credit to the BART Cap/Threshold
Actual CAMD data Avg NOx 01-08

Installation years Avg Heat Input 01-12

Avg Heat Input 01-08

Avg Heat Input 01-13

Avg Heat Input 09-13

Year

Actual NOx 

Emissions 

(from AMPD)

Actual Heat 

Input (from 

AMPD)

5-yr BART as if 

LNB not yet 

installed

5-yr BART as if LNB not 

yet installed

NOx Cap 

calculated from 

Supplemental 

proposal

NOx Cap using avg heat 

rate (01-13)

install years by 7/1/19

2001 34,019 191,638,695 34,019 34,019

2002 35,569 199,398,687 35,569 35,569

2003 31,620 183,478,417 31,620 31,620

2004 33,986 197,247,286 33,986 33,986

2005 33,221 191,786,039 33,221 33,221

2006 34,744 195,629,519 34,744 34,744

2007 35,253 196,676,299 35,253 35,253

2008 34,803 199,136,340 34,803 34,803

2009 30,501 184,315,616 34,152 32,862

2010 24,427 173,473,615 34,152 32,862

2011 19,837 180,463,627 34,152 32,862

2012 16,468 164,966,570 34,152 32,862

2013 17,456 173,672,459 34,152 32,862

2014 34,152 32,862

2015 34,152 32,862

2016 34,152 32,862

2017 34,152 32,862

2018 34,152 32,862

2019 19,749 19,003

2020 5,345 5,144

2021 5,345 5,144

2022 5,345 5,144

2023 5,345 5,144

2024 5,345 5,144

2025 5,345 5,144

2026 5,345 5,144

2027 5,345 5,144

2028 5,345 5,144

2029 5,345 5,144

2030 5,345 5,144

2031 5,345 5,144

2032 5,345 5,144
2033 5,345 5,144

2034 5,345 5,144

2035 5,345 5,144

2036 5,345 5,144

2037 5,345 5,144

2038 5,345 5,144

2039 5,345 5,144

2040 5,345 5,144

2041 5,345 5,144

2042 5,345 5,144

2043 5,345 5,144

2044 5,345 5,144

sum (09-44) 494,899 476,237

Difference 18,662

4%
34,152 NOx limit 0.24

188,184,226 Avg NOx rate 11-12 0.21

194,373,910 Avg NOx rate (01-08) 0.351

187,067,936

175,378,377

5-yr BART as if LNB not 

yet installed

5-yr BART as if LNB not yet 

installed

NOx Cap using Actual 

Past Annual Heat Input 

and for future use max 

heat input (01-13)

NOx Cap using BART limit 

of 0.048 (as suggested by 

Miller Sahu) and Max heat 

input

34,019 34,019

35,569 35,569

31,620 31,620

33,986 33,986

33,221 33,221

34,744 34,744

35,253 35,253

34,803 34,803

32,379 35,029

30,474 35,029

31,702 35,029

28,980 35,029

30,509 35,029

35,029 35,029

35,029 35,029

34,983 35,029

34,983 35,029

34,983 35,029

20,233 19,907

5,483 4,786

5,483 4,786

5,483 4,786

5,483 4,786

5,483 4,786

5,483 4,786

5,483 4,786

5,483 4,786

5,483 4,786

5,483 4,786

5,483 4,786

5,483 4,786

5,483 4,786
5,483 4,786

5,483 4,786

5,483 4,786

5,483 4,786

5,483 4,786

5,483 4,786

5,483 4,786

5,483 4,786

5,483 4,786

5,483 4,786

5,483 4,786

5,483 4,786

486,369 489,832

8,531 5,067

2% 1%
Actual CAMD data Avg NOx 01-08 34,152 NOx limit

 Closure or Installation years Avg Heat Input 01-12 188,184,226 Avg NOx rate 11-12

Avg Heat Input 01-08 194,373,910

TWG A1 = close one unit by 2020, install SCR on remaining two units by 2031

Year

Actual 

Emissions

5-yr BART as 

if LNB not yet 

installed

BART

Glide Path to 

Cap

EST. TWG A1 EST. TWG A1

install years by 7/1/19 cumulative cumulative cumulative

2001 34,019 34,019 34,019

2002 35,569 35,569 35,569

2003 31,620 31,620 31,620

2004 33,986 33,986 33,986

2005 33,221 33,221 33,221

2006 34,744 34,744 34,744

2007 35,253 35,253 35,253

2008 34,803 34,803 34,803

2009 30,501 34,152 34,152 34,152 30,501 30,501

2010 24,427 34,152 68,304 47,316 24,427 54,928

2011 19,837 34,152 102,456 60,480 19,837 74,765

2012 16,468 34,152 136,608 73,645 16,468 91,233

2013 17,456 34,152 170,759 86,809 17,456 108,689

2014 34,152 204,911 99,973 19,752 128,441

2015 34,152 239,063 113,137 19,752 148,193

2016 34,152 273,215 126,301 19,752 167,945

2017 34,152 307,367 139,466 19,752 187,697

2018 34,152 341,519 152,630 19,752 207,449

2019 19,749 361,267 165,794 19,752 227,201

2020 5,345 366,613 178,958 13,168 240,369

2021 5,345 371,958 192,122 13,168 253,537

2022 5,345 377,303 205,287 13,168 266,705

2023 5,345 382,648 218,451 13,168 279,873

2024 5,345 387,994 231,615 13,168 293,041

2025 5,345 393,339 244,779 13,168 306,209

2026 5,345 398,684 257,944 13,168 319,378

2027 5,345 404,030 271,108 13,168 332,546

2028 5,345 409,375 284,272 13,168 345,714

2029 5,345 414,720 297,436 13,168 358,882

2030 5,345 420,065 310,600 13,168 372,050

2031 5,345 425,411 323,765 4,391 376,441

2032 5,345 430,756 336,929 4,391 380,832

2033 5,345 436,101 350,093 4,391 385,223

2034 5,345 441,447 363,257 4,391 389,613

2035 5,345 446,792 376,421 4,391 394,004

2036 5,345 452,137 389,586 4,391 398,395
2037 5,345 457,482 402,750 4,391 402,786

2038 5,345 462,828 415,914 4,391 407,177

2039 5,345 468,173 429,078 4,391 411,568

2040 5,345 473,518 442,243 4,391 415,959

2041 5,345 478,864 455,407 4,391 420,350

2042 5,345 484,209 468,571 4,391 424,741

2043 5,345 489,554 481,735 4,391 429,132

2044 5,345 494,899 494,899 4,391 433,523

sum (09-44) 494,899 433,523

AVG

slope 13,164

** TWG A2 and A3 result in equivalent MW reductions

i.e., assuming Navajo Nation elects to purchase 170 MW, and capacity icnrease also include 19 MW to make up for LADWP 

Under A2, close one unit, increase capacity by 170 + 19 MW = capacity reduction of 750 - 170 MW - 19 MW = 561 MW

Under A3, curtail one unit by LADWP + NVEnergy - Navajo Nation share = 477 + 254 - 170 = 561 MW
0.24

0.21

33,736

87%
W to make up for LADWP and NV Energy shortfall from 1 750 MW unit

W - 19 MW = 561 MW
0

100,000

200,000

300,000

400,000

500,000

600,000

20092010201120122013201420152016201720182019202020212022202320242025202620272028202920302031203220332034203520362037203820392040204120422043204

4

Cumulative N

Ox Emissions

Year

Comparison of NOx Cap with TWG Alternative A1 (1 unit closes in 2020, 

no capacity increase, 2 units meet 0.07 lb/MMBtu in 2031) 

Glide Path to Cap

BART

TWG A1

NOx Cap over 2009 - 2044
Actual CAMD data Avg NOx 01-08 34,152 NOx limit

 Closure or Installation years Avg Heat Input 01-12 188,184,226 Avg NOx rate 11-12

Avg Heat Input 01-08 194,373,910

TWG A2 = close one unit with capacity increase up to 189 MW (19 MW + max 170 MW - depends on how much of NGS Nav

Year

Actual 

Emissions

5-yr BART as 

if LNB not yet 

installed

BART

Glide Path to 

Cap

EST. TWG A2 EST. TWG A2

install years by 7/1/19 cumulative cumulative cumulative

2001 34,019 34,019 34,019

2002 35,569 35,569 35,569

2003 31,620 31,620 31,620

2004 33,986 33,986 33,986

2005 33,221 33,221 33,221

2006 34,744 34,744 34,744

2007 35,253 35,253 35,253

2008 34,803 34,803 34,803

2009 30,501 34,152 34,152 34,152 30,501 30,501

2010 24,427 34,152 68,304 47,316 24,427 54,928

2011 19,837 34,152 102,456 60,480 19,837 74,765

2012 16,468 34,152 136,608 73,645 16,468 91,233

2013 17,456 34,152 170,759 86,809 17,456 108,689

2014 34,152 204,911 99,973 19,752 128,441

2015 34,152 239,063 113,137 19,752 148,193

2016 34,152 273,215 126,301 19,752 167,945

2017 34,152 307,367 139,466 19,752 187,697

2018 34,152 341,519 152,630 19,752 207,449

2019 19,749 361,267 165,794 19,752 227,201

2020 5,345 366,613 178,958 14,827 242,029

2021 5,345 371,958 192,122 14,827 256,856

2022 5,345 377,303 205,287 14,827 271,683

2023 5,345 382,648 218,451 14,827 286,510

2024 5,345 387,994 231,615 14,827 301,337

2025 5,345 393,339 244,779 14,827 316,165

2026 5,345 398,684 257,944 14,827 330,992

2027 5,345 404,030 271,108 14,827 345,819

2028 5,345 409,375 284,272 14,827 360,646

2029 5,345 414,720 297,436 14,827 375,473

2030 5,345 420,065 310,600 14,827 390,301

2031 5,345 425,411 323,765 4,944 395,245

2032 5,345 430,756 336,929 4,944 400,189

2033 5,345 436,101 350,093 4,944 405,133

2034 5,345 441,447 363,257 4,944 410,077

2035 5,345 446,792 376,421 4,944 415,022

2036 5,345 452,137 389,586 4,944 419,966
2037 5,345 457,482 402,750 4,944 424,910

2038 5,345 462,828 415,914 4,944 429,854

2039 5,345 468,173 429,078 4,944 434,799

2040 5,345 473,518 442,243 4,944 439,743

2041 5,345 478,864 455,407 4,944 444,687

2042 5,345 484,209 468,571 4,944 449,631

2043 5,345 489,554 481,735 4,944 454,575

2044 5,345 494,899 494,899 4,944 459,520

sum (09-44) 494,899 459,520

AVG

slope 13,164

** TWG A2 and A3 result in equivalent MW reductions

i.e., assuming Navajo Nation elects to purchase 170 MW, and capacity icnrease also include 19 MW to make up for LADWP 

Under A2, close one unit, increase capacity by 170 + 19 MW = capacity reduction of 750 - 170 MW - 19 MW = 561 MW

Under A3, curtail one unit by LADWP + NVEnergy - Navajo Nation share = 477 + 254 - 170 = 561 MW
0.24

0.21

on how much of NGS Navajo Nation buys)

33,736

85%
W to make up for LADWP and NV Energy shortfall from 1 750 MW unit

W - 19 MW = 561 MW
0

100,000

200,000

300,000

400,000

500,000

600,000

20092010201120122013201420152016201720182019202020212022202320242025202620272028202920302031203220332034203520362037203820392040204120422043204

4

Cumulative N

Ox Emissions

Year

Comparison of NOx Cap with TWG Alternative A2 (1 unit closes plus 

maximum capacity increase (189 MW) in 2020; and Remaining 2 units 

meet 0.07 lb/MMBtu in 2031)

Glide Path to Cap

BART

Est TWG A2

NOx Cap over 2009 - 2044
Actual CAMD data Avg NOx 01-08 34,152 NOx limit

 Closure or Installation years Avg Heat Input 01-12 188,184,226 Avg NOx rate 11-12

Avg Heat Input 01-08 194,373,910

TWG A3a = curtail one unit by no less than 561 MW (Based on shares of (LADWP+NVE - Navajo Nation)=> 477 + 254 - (max 

TWG A3b = curtail all 3 units equally by total of 561 MW, install SCR on Units 1 and 3

TWG A3c = curtail Units 1 and 3 by 561 MW total; install SCR on Units 1 and 3

Year

Actual 

Emissions

5-yr BART as 

if LNB not yet 

installed

BART

Glide Path to 

Cap

EST. TWG 

A3a

EST. TWG 

A3a

install years by 7/1/19 cumulative cumulative cumulative

2001 34,019 34,019 34,019

2002 35,569 35,569 35,569

2003 31,620 31,620 31,620

2004 33,986 33,986 33,986

2005 33,221 33,221 33,221

2006 34,744 34,744 34,744

2007 35,253 35,253 35,253

2008 34,803 34,803 34,803

2009 30,501 34,152 34,152 34,152 30,501 30,501

2010 24,427 34,152 68,304 47,316 24,427 54,928

2011 19,837 34,152 102,456 60,480 19,837 74,765

2012 16,468 34,152 136,608 73,645 16,468 91,233

2013 17,456 34,152 170,759 86,809 17,456 108,689

2014 34,152 204,911 99,973 19,752 128,441

2015 34,152 239,063 113,137 19,752 148,193

2016 34,152 273,215 126,301 19,752 167,945

2017 34,152 307,367 139,466 19,752 187,697

2018 34,152 341,519 152,630 19,752 207,449

2019 19,749 361,267 165,794 19,752 227,201

2020 5,345 366,613 178,958 14,827 242,029

2021 5,345 371,958 192,122 14,827 256,856

2022 5,345 377,303 205,287 14,827 271,683

2023 5,345 382,648 218,451 14,827 286,510

2024 5,345 387,994 231,615 14,827 301,337

2025 5,345 393,339 244,779 14,827 316,165

2026 5,345 398,684 257,944 14,827 330,992

2027 5,345 404,030 271,108 14,827 345,819

2028 5,345 409,375 284,272 14,827 360,646

2029 5,345 414,720 297,436 14,827 375,473

2030 5,345 420,065 310,600 14,827 390,301

2031 5,345 425,411 323,765 6,288 396,588

2032 5,345 430,756 336,929 6,288 402,876

2033 5,345 436,101 350,093 6,288 409,164

2034 5,345 441,447 363,257 6,288 415,452
2035 5,345 446,792 376,421 6,288 421,740

2036 5,345 452,137 389,586 6,288 428,028

2037 5,345 457,482 402,750 6,288 434,316

2038 5,345 462,828 415,914 6,288 440,603

2039 5,345 468,173 429,078 6,288 446,891

2040 5,345 473,518 442,243 6,288 453,179

2041 5,345 478,864 455,407 6,288 459,467

2042 5,345 484,209 468,571 6,288 465,755

2043 5,345 489,554 481,735 6,288 472,043

2044 5,345 494,899 494,899 6,288 478,331

sum (09-44) 494,899 478,331

slope 13,164

** TWG A2 and A3 result in equivalent MW reductions

i.e., assuming Navajo Nation elects to purchase 170 MW, and capacity icnrease also include 19 MW to make up for LADWP 

Under A2, close one unit, increase capacity by 170 + 19 MW = capacity reduction of 750 - 170 MW - 19 MW = 561 MW

Under A3, curtail one unit by LADWP + NVEnergy - Navajo Nation share = 477 + 254 - 170 = 561 MW
0.24

0.21

ation)=> 477 + 254 - (max of 170) MW = 561 MW; SCR installed on the 2 units that are not curtailed

EST. TWG 

A3b

EST. TWG 

A3b

EST. TWG 

A3c

EST. TWG 

A3c

cumulative cumulative

34,019 34,019 33,736

35,569 35,569

31,620 31,620

33,986 33,986

33,221 33,221

34,744 34,744

35,253 35,253

34,803 34,803

30,501 30,501 30,501 30,501

24,427 54,928 24,427 54,928

19,837 74,765 19,837 74,765

16,468 91,233 16,468 91,233

17,456 108,689 17,456 108,689

19,752 128,441 19,752 128,441

19,752 148,193 19,752 148,193

19,752 167,945 19,752 167,945

19,752 187,697 19,752 187,697

19,752 207,449 19,752 207,449

19,752 227,201 19,752 227,201

14,827 242,029 14,827 242,029

14,827 256,856 14,827 256,856

14,827 271,683 14,827 271,683

14,827 286,510 14,827 286,510

14,827 301,337 14,827 301,337

14,827 316,165 14,827 316,165

14,827 330,992 14,827 330,992

14,827 345,819 14,827 345,819

14,827 360,646 14,827 360,646

14,827 375,473 14,827 375,473

14,827 390,301 14,827 390,301

8,947 399,247 10,276 400,577

8,947 408,194 10,276 410,853 0.813616

8,947 417,141 10,276 421,129

8,947 426,087 10,276 431,405
8,947 435,034 10,276 441,681

8,947 443,981 10,276 451,957

8,947 452,927 10,276 462,233

8,947 461,874 10,276 472,509

8,947 470,821 10,276 482,786

8,947 479,767 10,276 493,062

8,947 488,714 10,276 503,338

8,947 497,661 10,276 513,614

8,947 506,608 10,276 523,890

8,947 515,554 10,276 534,166

515,554 534,166

W to make up for LADWP and NV Energy shortfall from 1 750 MW unit

W - 19 MW = 561 MW
0

100,000

200,000

300,000

400,000

500,000

600,000

20092010201120122013201420152016201720182019202020212022202320242025202620272028202920302031203220332034203520362037203820392040204120422043204

4

Cumulative N

Ox Emissions

Year

Comparison of NOx Cap with TWG Alternative A2 (1 unit closes plus 

maximum capacity increase (189 MW) in 2020; and Remaining 2 units 

meet 0.07 lb/MMBtu in 2031)

Glide Path to Cap

BART

Est TWG A3

NOx Cap over 2009 - 2044
Actual CAMD data Avg NOx 01-08 34,152

 Installation years Avg Heat Input 01-12 188,184,226 Avg NOx rate 11-12

Avg Heat Input 01-08 194,373,910

Year

Actual 

Emissions

5-yr BART as 

if LNB not yet 

installed

BART

Glide Path to 

Cap

Alt B Alt B

install years by 7/1/19 cumulative cumulative Est cumulative

2001 34,019 34,019

2002 35,569 35,569

2003 31,620 31,620

2004 33,986 33,986

2005 33,221 33,221

2006 34,744 34,744

2007 35,253 35,253

2008 34,803 34,803

2009 30,501 34,152 34,152 34,152 30,501

2010 24,427 34,152 68,304 53,288 24,427

2011 19,837 34,152 102,456 72,423 19,837

2012 16,468 34,152 136,608 91,559 23,325

2013 34,152 170,759 110,695 23,325

2014 34,152 204,911 129,830 23,325

2015 34,152 239,063 148,966 23,325

2016 34,152 273,215 168,101 23,325

2017 34,152 307,367 187,237 23,325

2018 34,152 341,519 206,373 23,325

2019 19,749 361,268 225,508 23,325

2020 5,345 366,613 244,644 15,550

2021 5,345 371,958 263,780 15,550

2022 5,345 377,304 282,915 15,550

2023 5,345 382,649 302,051 15,550

2024 5,345 387,994 321,187 15,550

2025 5,345 393,339 340,322 15,550

2026 5,345 398,685 359,458 15,550

2027 5,345 404,030 378,594 15,550

2028 5,345 409,375 397,729 15,550

2029 5,345 414,720 416,865 15,550

2030 5,345 420,066 422,067

2031 5,345 425,411 427,270

2032 5,345 430,756 432,472

2033 5,345 436,101 437,674

2034 5,345 441,447 442,876

2035 5,345 446,792 448,079

2036 5,345 452,137 453,281

2037 5,345 457,482 458,483

416,865
2038 5,345 462,828 463,686

2039 5,345 468,173 468,888

2040 5,345 473,518 474,090

2041 5,345 478,864 479,292

2042 5,345 484,209 484,495

2043 5,345 489,554 489,697

2044 5,345 494,899 494,899

sum (09-44) 494,899

slope (2029 cap) 19,136

slope (2044 cap) 5,202

494,899
NOx limit 0.24

Avg NOx rate 11-12 0.21

Est. 3 SCR 

meeting 

0.055

Est. 3 SCR 

meeting 

0.055

Est. 3 SCR 

meeting 

0.07

Est. 3 SCR 

meeting 

0.07

cumulative cumulative

30,501 30,501 30,501 30,501

24,427 54,928 24,427 54,928

19,837 74,765 19,837 74,765

16,468 91,233 16,468 91,233

19,752 110,985 19,752 110,985

19,752 130,737 19,752 130,737

19,752 150,489 19,752 150,489

19,752 170,241 19,752 170,241

19,752 189,993 19,752 189,993

19,752 209,745 19,752 209,745

19,752 229,497 19,752 229,497

19,752 249,249 19,752 249,249

19,752 269,001 19,752 269,001

19,752 288,753 19,752 288,753

19,752 308,505 19,752 308,505

19,752 328,258 19,752 328,258

19,752 348,010 19,752 348,010

19,752 367,762 15,874 363,883

19,752 387,514 11,338 375,222

15,388 402,902 6,803 382,025

10,367 413,268 6,803 388,828

5,345 418,613 6,803 395,631

5,345 423,959 6,803 402,434

5,345 429,304 6,803 409,237

5,345 434,649 6,803 416,040

5,345 439,995 6,803 422,844

5,345 445,340 6,803 429,647

5,345 450,685 6,803 436,450

5,345 456,030 6,803 443,253
5,345 461,376 6,803 450,056

5,345 466,721 6,803 456,859

5,345 472,066 6,803 463,662

5,345 477,412 6,803 470,465

5,345 482,757 6,803 477,268

5,345 488,102 6,803 484,071

5,345 493,447 6,803 490,874
0

100,000

200,000

300,000

400,000

500,000

600,000

20092010201120122013201420152016201720182019202020212022202320242025202620272028202920302031203220332034203520362037203820392040204120422043204

4

Cumulative N

Ox Emissions

Year

Comparison of Nested NOx Caps with TWG Alternative B (assuming 

installation of 3 SCR to meet Nested Caps) 

Glide Path to Cap

BART

Est. 3 SCR meeting 0.055

Est. 3 SCR meeting 0.07

NOx Cap over 2009 - 2044

NOx Cap over 2009 - 2029
Unit # Year

2009 3 2009

2010 2 2010

2011 1 2011

2012 3 2012

2013 2 2013

2014 1 2014

2015 3 2015

2016 2 2016

2017 1 2017

2018 3 2018

2019 2 2019

2020 1 2020

2021 3 2021

2022 2 2022

2023 1 2023

2024 3 2024

2025 2 2025

2026 1 2026

2027 3 2027

2028 2 2028

2029 1 2029

Major

Major

Minor

Major

Minor

Major

Minor
Summary of Visibility Modeling Results - visibility method 8b and ammonia scenario 1

Scaled 2009 and 2010

From document titled: "NGS_NFR_visibility_results_140311.xlsx"

Visibility Impact of NGS on:

Year BART TWG A1 TWG A2 TWG A3 BART TWG A1 TWG A2 TWG A3

2001 4.48 4.48 4.48 4.48 4.94 4.94 4.94 4.94

2002 4.48 4.48 4.48 4.48 4.94 4.94 4.94 4.94

2003 4.48 4.48 4.48 4.48 4.94 4.94 4.94 4.94

2004 4.48 4.48 4.48 4.48 4.94 4.94 4.94 4.94

2005 4.48 4.48 4.48 4.48 4.94 4.94 4.94 4.94

2006 4.48 4.48 4.48 4.48 4.94 4.94 4.94 4.94

2007 4.48 4.48 4.48 4.48 4.94 4.94 4.94 4.94

2008 4.48 4.48 4.48 4.48 4.94 4.94 4.94 4.94

2009 4.48 4.48 4.48 4.48 4.94 4.94 4.94 4.94

2010 4.48 3.93 3.93 3.93 4.94 4.40 4.40 4.40

2011 4.48 3.38 3.38 3.38 4.94 3.86 3.86 3.86

2012 4.48 2.83 2.83 2.83 4.94 3.32 3.32 3.32

2013 4.48 2.83 2.83 2.83 4.94 3.32 3.32 3.32

2014 4.48 2.83 2.83 2.83 4.94 3.32 3.32 3.32

2015 4.48 2.83 2.83 2.83 4.94 3.32 3.32 3.32

2016 4.48 2.83 2.83 2.83 4.94 3.32 3.32 3.32

2017 4.48 2.83 2.83 2.83 4.94 3.32 3.32 3.32

2018 4.48 2.83 2.83 2.83 4.94 3.32 3.32 3.32

2019 4.48 2.83 2.83 2.83 4.94 3.32 3.32 3.32

2020 1.07 1.98 2.2 2.2 1.35 2.41 2.62 2.62

2021 1.07 1.98 2.2 2.2 1.35 2.41 2.62 2.62

2022 1.07 1.98 2.2 2.2 1.35 2.41 2.62 2.62

2023 1.07 1.98 2.2 2.2 1.35 2.41 2.62 2.62

2024 1.07 1.98 2.2 2.2 1.35 2.41 2.62 2.62

2025 1.07 1.98 2.2 2.2 1.35 2.41 2.62 2.62

2026 1.07 1.98 2.2 2.2 1.35 2.41 2.62 2.62

2027 1.07 1.98 2.2 2.2 1.35 2.41 2.62 2.62

2028 1.07 1.98 2.2 2.2 1.35 2.41 2.62 2.62

2029 1.07 1.98 2.2 2.2 1.35 2.41 2.62 2.62

2030 1.07 1.98 2.2 2.2 1.35 2.41 2.62 2.62

2031 1.07 0.83 0.93 1.09 1.35 1.05 1.18 1.39

2032 1.07 0.83 0.93 1.09 1.35 1.05 1.18 1.39

2033 1.07 0.83 0.93 1.09 1.35 1.05 1.18 1.39

2034 1.07 0.83 0.93 1.09 1.35 1.05 1.18 1.39

2035 1.07 0.83 0.93 1.09 1.35 1.05 1.18 1.39

2036 1.07 0.83 0.93 1.09 1.35 1.05 1.18 1.39

2037 1.07 0.83 0.93 1.09 1.35 1.05 1.18 1.39

2038 1.07 0.83 0.93 1.09 1.35 1.05 1.18 1.39

2039 1.07 0.83 0.93 1.09 1.35 1.05 1.18 1.39

2040 1.07 0.83 0.93 1.09 1.35 1.05 1.18 1.39

Arches Bryce
2041 1.07 0.83 0.93 1.09 1.35 1.05 1.18 1.39

2042 1.07 0.83 0.93 1.09 1.35 1.05 1.18 1.39

2043 1.07 0.83 0.93 1.09 1.35 1.05 1.18 1.39

2044 1.07 0.83 0.93 1.09 1.35 1.05 1.18 1.39
BART TWG A1 TWG A2 TWG A3 BART TWG A1 TWG A2 TWG A3 BART

6.05 6.05 6.05 6.05 7.71 7.71 7.71 7.71 8.42

6.05 6.05 6.05 6.05 7.71 7.71 7.71 7.71 8.42

6.05 6.05 6.05 6.05 7.71 7.71 7.71 7.71 8.42

6.05 6.05 6.05 6.05 7.71 7.71 7.71 7.71 8.42

6.05 6.05 6.05 6.05 7.71 7.71 7.71 7.71 8.42

6.05 6.05 6.05 6.05 7.71 7.71 7.71 7.71 8.42

6.05 6.05 6.05 6.05 7.71 7.71 7.71 7.71 8.42

6.05 6.05 6.05 6.05 7.71 7.71 7.71 7.71 8.42

6.05 6.05 6.05 6.05 7.71 7.71 7.71 7.71 8.42

6.05 5.35 5.35 5.35 7.71 7.00 7.00 7.00 8.42

6.05 4.65 4.65 4.65 7.71 6.29 6.29 6.29 8.42

6.05 3.95 3.95 3.95 7.71 5.58 5.58 5.58 8.42

6.05 3.95 3.95 3.95 7.71 5.58 5.58 5.58 8.42

6.05 3.95 3.95 3.95 7.71 5.58 5.58 5.58 8.42

6.05 3.95 3.95 3.95 7.71 5.58 5.58 5.58 8.42

6.05 3.95 3.95 3.95 7.71 5.58 5.58 5.58 8.42

6.05 3.95 3.95 3.95 7.71 5.58 5.58 5.58 8.42

6.05 3.95 3.95 3.95 7.71 5.58 5.58 5.58 8.42

6.05 3.95 3.95 3.95 7.71 5.58 5.58 5.58 8.42

1.52 2.81 3.09 3.1 2.36 4.27 4.6 4.59 3.16

1.52 2.81 3.09 3.1 2.36 4.27 4.6 4.59 3.16

1.52 2.81 3.09 3.1 2.36 4.27 4.6 4.59 3.16

1.52 2.81 3.09 3.1 2.36 4.27 4.6 4.59 3.16

1.52 2.81 3.09 3.1 2.36 4.27 4.6 4.59 3.16

1.52 2.81 3.09 3.1 2.36 4.27 4.6 4.59 3.16

1.52 2.81 3.09 3.1 2.36 4.27 4.6 4.59 3.16

1.52 2.81 3.09 3.1 2.36 4.27 4.6 4.59 3.16

1.52 2.81 3.09 3.1 2.36 4.27 4.6 4.59 3.16

1.52 2.81 3.09 3.1 2.36 4.27 4.6 4.59 3.16

1.52 2.81 3.09 3.1 2.36 4.27 4.6 4.59 3.16

1.52 1.2 1.34 1.56 2.36 1.88 2.09 2.42 3.16

1.52 1.2 1.34 1.56 2.36 1.88 2.09 2.42 3.16

1.52 1.2 1.34 1.56 2.36 1.88 2.09 2.42 3.16

1.52 1.2 1.34 1.56 2.36 1.88 2.09 2.42 3.16

1.52 1.2 1.34 1.56 2.36 1.88 2.09 2.42 3.16

1.52 1.2 1.34 1.56 2.36 1.88 2.09 2.42 3.16

1.52 1.2 1.34 1.56 2.36 1.88 2.09 2.42 3.16

1.52 1.2 1.34 1.56 2.36 1.88 2.09 2.42 3.16

1.52 1.2 1.34 1.56 2.36 1.88 2.09 2.42 3.16

1.52 1.2 1.34 1.56 2.36 1.88 2.09 2.42 3.16

Canyonlands Capitol Reef
1.52 1.2 1.34 1.56 2.36 1.88 2.09 2.42 3.16

1.52 1.2 1.34 1.56 2.36 1.88 2.09 2.42 3.16

1.52 1.2 1.34 1.56 2.36 1.88 2.09 2.42 3.16

1.52 1.2 1.34 1.56 2.36 1.88 2.09 2.42 3.16
TWG A1 TWG A2 TWG A3 BART TWG A1 TWG A2 TWG A3 BART TWG A1

8.42 8.42 8.42 1.46 1.46 1.46 1.46 3.23 3.23

8.42 8.42 8.42 1.46 1.46 1.46 1.46 3.23 3.23

8.42 8.42 8.42 1.46 1.46 1.46 1.46 3.23 3.23

8.42 8.42 8.42 1.46 1.46 1.46 1.46 3.23 3.23

8.42 8.42 8.42 1.46 1.46 1.46 1.46 3.23 3.23

8.42 8.42 8.42 1.46 1.46 1.46 1.46 3.23 3.23

8.42 8.42 8.42 1.46 1.46 1.46 1.46 3.23 3.23

8.42 8.42 8.42 1.46 1.46 1.46 1.46 3.23 3.23

8.42 8.42 8.42 1.46 1.46 1.46 1.46 3.23 3.23

7.78 7.78 7.78 1.46 1.26 1.26 1.26 3.23 2.78

7.15 7.15 7.15 1.46 1.06 1.06 1.06 3.23 2.33

6.51 6.51 6.51 1.46 0.86 0.86 0.86 3.23 1.88

6.51 6.51 6.51 1.46 0.86 0.86 0.86 3.23 1.88

6.51 6.51 6.51 1.46 0.86 0.86 0.86 3.23 1.88

6.51 6.51 6.51 1.46 0.86 0.86 0.86 3.23 1.88

6.51 6.51 6.51 1.46 0.86 0.86 0.86 3.23 1.88

6.51 6.51 6.51 1.46 0.86 0.86 0.86 3.23 1.88

6.51 6.51 6.51 1.46 0.86 0.86 0.86 3.23 1.88

6.51 6.51 6.51 1.46 0.86 0.86 0.86 3.23 1.88

5.11 5.47 5.46 0.39 0.57 0.64 0.64 0.66 1.28

5.11 5.47 5.46 0.39 0.57 0.64 0.64 0.66 1.28

5.11 5.47 5.46 0.39 0.57 0.64 0.64 0.66 1.28

5.11 5.47 5.46 0.39 0.57 0.64 0.64 0.66 1.28

5.11 5.47 5.46 0.39 0.57 0.64 0.64 0.66 1.28

5.11 5.47 5.46 0.39 0.57 0.64 0.64 0.66 1.28

5.11 5.47 5.46 0.39 0.57 0.64 0.64 0.66 1.28

5.11 5.47 5.46 0.39 0.57 0.64 0.64 0.66 1.28

5.11 5.47 5.46 0.39 0.57 0.64 0.64 0.66 1.28

5.11 5.47 5.46 0.39 0.57 0.64 0.64 0.66 1.28

5.11 5.47 5.46 0.39 0.57 0.64 0.64 0.66 1.28

2.53 2.81 3.16 0.39 0.3 0.33 0.36 0.66 0.51

2.53 2.81 3.16 0.39 0.3 0.33 0.36 0.66 0.51

2.53 2.81 3.16 0.39 0.3 0.33 0.36 0.66 0.51

2.53 2.81 3.16 0.39 0.3 0.33 0.36 0.66 0.51

2.53 2.81 3.16 0.39 0.3 0.33 0.36 0.66 0.51

2.53 2.81 3.16 0.39 0.3 0.33 0.36 0.66 0.51

2.53 2.81 3.16 0.39 0.3 0.33 0.36 0.66 0.51

2.53 2.81 3.16 0.39 0.3 0.33 0.36 0.66 0.51

2.53 2.81 3.16 0.39 0.3 0.33 0.36 0.66 0.51

2.53 2.81 3.16 0.39 0.3 0.33 0.36 0.66 0.51

Grand Canyon Mazatzal Mesa Verde
2.53 2.81 3.16 0.39 0.3 0.33 0.36 0.66 0.51

2.53 2.81 3.16 0.39 0.3 0.33 0.36 0.66 0.51

2.53 2.81 3.16 0.39 0.3 0.33 0.36 0.66 0.51

2.53 2.81 3.16 0.39 0.3 0.33 0.36 0.66 0.51
TWG A2 TWG A3 BART TWG A1 TWG A2 TWG A3 BART TWG A1 TWG A2

3.23 3.23 3.38 3.38 3.38 3.38 1.32 1.32 1.32

3.23 3.23 3.38 3.38 3.38 3.38 1.32 1.32 1.32

3.23 3.23 3.38 3.38 3.38 3.38 1.32 1.32 1.32

3.23 3.23 3.38 3.38 3.38 3.38 1.32 1.32 1.32

3.23 3.23 3.38 3.38 3.38 3.38 1.32 1.32 1.32

3.23 3.23 3.38 3.38 3.38 3.38 1.32 1.32 1.32

3.23 3.23 3.38 3.38 3.38 3.38 1.32 1.32 1.32

3.23 3.23 3.38 3.38 3.38 3.38 1.32 1.32 1.32

3.23 3.23 3.38 3.38 3.38 3.38 1.32 1.32 1.32

2.78 2.78 3.38 2.91 2.91 2.91 1.32 1.14 1.14

2.33 2.33 3.38 2.45 2.45 2.45 1.32 0.96 0.96

1.88 1.88 3.38 1.98 1.98 1.98 1.32 0.78 0.78

1.88 1.88 3.38 1.98 1.98 1.98 1.32 0.78 0.78

1.88 1.88 3.38 1.98 1.98 1.98 1.32 0.78 0.78

1.88 1.88 3.38 1.98 1.98 1.98 1.32 0.78 0.78

1.88 1.88 3.38 1.98 1.98 1.98 1.32 0.78 0.78

1.88 1.88 3.38 1.98 1.98 1.98 1.32 0.78 0.78

1.88 1.88 3.38 1.98 1.98 1.98 1.32 0.78 0.78

1.88 1.88 3.38 1.98 1.98 1.98 1.32 0.78 0.78

1.43 1.43 0.74 1.35 1.51 1.5 0.33 0.53 0.59

1.43 1.43 0.74 1.35 1.51 1.5 0.33 0.53 0.59

1.43 1.43 0.74 1.35 1.51 1.5 0.33 0.53 0.59

1.43 1.43 0.74 1.35 1.51 1.5 0.33 0.53 0.59

1.43 1.43 0.74 1.35 1.51 1.5 0.33 0.53 0.59

1.43 1.43 0.74 1.35 1.51 1.5 0.33 0.53 0.59

1.43 1.43 0.74 1.35 1.51 1.5 0.33 0.53 0.59

1.43 1.43 0.74 1.35 1.51 1.5 0.33 0.53 0.59

1.43 1.43 0.74 1.35 1.51 1.5 0.33 0.53 0.59

1.43 1.43 0.74 1.35 1.51 1.5 0.33 0.53 0.59

1.43 1.43 0.74 1.35 1.51 1.5 0.33 0.53 0.59

0.57 0.67 0.74 0.57 0.64 0.72 0.33 0.25 0.28

0.57 0.67 0.74 0.57 0.64 0.72 0.33 0.25 0.28

0.57 0.67 0.74 0.57 0.64 0.72 0.33 0.25 0.28

0.57 0.67 0.74 0.57 0.64 0.72 0.33 0.25 0.28

0.57 0.67 0.74 0.57 0.64 0.72 0.33 0.25 0.28

0.57 0.67 0.74 0.57 0.64 0.72 0.33 0.25 0.28

0.57 0.67 0.74 0.57 0.64 0.72 0.33 0.25 0.28

0.57 0.67 0.74 0.57 0.64 0.72 0.33 0.25 0.28

0.57 0.67 0.74 0.57 0.64 0.72 0.33 0.25 0.28

0.57 0.67 0.74 0.57 0.64 0.72 0.33 0.25 0.28

Mesa Verde Petrified Forest Pine Mountain
0.57 0.67 0.74 0.57 0.64 0.72 0.33 0.25 0.28

0.57 0.67 0.74 0.57 0.64 0.72 0.33 0.25 0.28

0.57 0.67 0.74 0.57 0.64 0.72 0.33 0.25 0.28

0.57 0.67 0.74 0.57 0.64 0.72 0.33 0.25 0.28
TWG A3 BART TWG A1 TWG A2 TWG A3 BART TWG A1 TWG A2 TWG A3

1.32 2.41 2.41 2.41 2.41 4.42 4.42 4.42 4.42

1.32 2.41 2.41 2.41 2.41 4.42 4.42 4.42 4.42

1.32 2.41 2.41 2.41 2.41 4.42 4.42 4.42 4.42

1.32 2.41 2.41 2.41 2.41 4.42 4.42 4.42 4.42

1.32 2.41 2.41 2.41 2.41 4.42 4.42 4.42 4.42

1.32 2.41 2.41 2.41 2.41 4.42 4.42 4.42 4.42

1.32 2.41 2.41 2.41 2.41 4.42 4.42 4.42 4.42

1.32 2.41 2.41 2.41 2.41 4.42 4.42 4.42 4.42

1.32 2.41 2.41 2.41 2.41 4.42 4.42 4.42 4.42

1.14 2.41 2.11 2.11 2.11 4.42 3.96 3.96 3.96

0.96 2.41 1.82 1.82 1.82 4.42 3.51 3.51 3.51

0.78 2.41 1.52 1.52 1.52 4.42 3.05 3.05 3.05

0.78 2.41 1.52 1.52 1.52 4.42 3.05 3.05 3.05

0.78 2.41 1.52 1.52 1.52 4.42 3.05 3.05 3.05

0.78 2.41 1.52 1.52 1.52 4.42 3.05 3.05 3.05

0.78 2.41 1.52 1.52 1.52 4.42 3.05 3.05 3.05

0.78 2.41 1.52 1.52 1.52 4.42 3.05 3.05 3.05

0.78 2.41 1.52 1.52 1.52 4.42 3.05 3.05 3.05

0.78 2.41 1.52 1.52 1.52 4.42 3.05 3.05 3.05

0.59 0.62 1.02 1.15 1.14 1.14 2.16 2.4 2.39

0.59 0.62 1.02 1.15 1.14 1.14 2.16 2.4 2.39

0.59 0.62 1.02 1.15 1.14 1.14 2.16 2.4 2.39

0.59 0.62 1.02 1.15 1.14 1.14 2.16 2.4 2.39

0.59 0.62 1.02 1.15 1.14 1.14 2.16 2.4 2.39

0.59 0.62 1.02 1.15 1.14 1.14 2.16 2.4 2.39

0.59 0.62 1.02 1.15 1.14 1.14 2.16 2.4 2.39

0.59 0.62 1.02 1.15 1.14 1.14 2.16 2.4 2.39

0.59 0.62 1.02 1.15 1.14 1.14 2.16 2.4 2.39

0.59 0.62 1.02 1.15 1.14 1.14 2.16 2.4 2.39

0.59 0.62 1.02 1.15 1.14 1.14 2.16 2.4 2.39

0.3 0.62 0.46 0.51 0.59 1.14 0.9 1.01 1.18

0.3 0.62 0.46 0.51 0.59 1.14 0.9 1.01 1.18

0.3 0.62 0.46 0.51 0.59 1.14 0.9 1.01 1.18

0.3 0.62 0.46 0.51 0.59 1.14 0.9 1.01 1.18

0.3 0.62 0.46 0.51 0.59 1.14 0.9 1.01 1.18

0.3 0.62 0.46 0.51 0.59 1.14 0.9 1.01 1.18

0.3 0.62 0.46 0.51 0.59 1.14 0.9 1.01 1.18

0.3 0.62 0.46 0.51 0.59 1.14 0.9 1.01 1.18

0.3 0.62 0.46 0.51 0.59 1.14 0.9 1.01 1.18

0.3 0.62 0.46 0.51 0.59 1.14 0.9 1.01 1.18

Sycamore Zion
0.3 0.62 0.46 0.51 0.59 1.14 0.9 1.01 1.18

0.3 0.62 0.46 0.51 0.59 1.14 0.9 1.01 1.18

0.3 0.62 0.46 0.51 0.59 1.14 0.9 1.01 1.18

0.3 0.62 0.46 0.51 0.59 1.14 0.9 1.01 1.18
BART TWG A1 TWG A2 TWG A3

47.82 47.82 47.82 47.82

47.82 47.82 47.82 47.82

47.82 47.82 47.82 47.82

47.82 47.82 47.82 47.82

47.82 47.82 47.82 47.82

47.82 47.82 47.82 47.82

47.82 47.82 47.82 47.82

47.82 47.82 47.82 47.82

47.82 47.82 47.82 47.82

47.82 42.63 42.63 42.63

47.82 37.45 37.45 37.45

47.82 32.26 32.26 32.26

47.82 32.26 32.26 32.26

47.82 32.26 32.26 32.26

47.82 32.26 32.26 32.26

47.82 32.26 32.26 32.26

47.82 32.26 32.26 32.26

47.82 32.26 32.26 32.26

47.82 32.26 32.26 32.26

13.34 23.49 25.70 25.66

13.34 23.49 25.70 25.66

13.34 23.49 25.70 25.66

13.34 23.49 25.70 25.66

13.34 23.49 25.70 25.66

13.34 23.49 25.70 25.66

13.34 23.49 25.70 25.66

13.34 23.49 25.70 25.66

13.34 23.49 25.70 25.66

13.34 23.49 25.70 25.66

13.34 23.49 25.70 25.66

13.34 10.48 11.69 13.44

13.34 10.48 11.69 13.44

13.34 10.48 11.69 13.44

13.34 10.48 11.69 13.44

13.34 10.48 11.69 13.44

13.34 10.48 11.69 13.44

13.34 10.48 11.69 13.44

13.34 10.48 11.69 13.44

13.34 10.48 11.69 13.44

13.34 10.48 11.69 13.44

Cumulative (11 Class I areas)
13.34 10.48 11.69 13.44

13.34 10.48 11.69 13.44

13.34 10.48 11.69 13.44

13.34 10.48 11.69 13.44
0

10

20

30

40

50

60

20012002200320042005200620072008200920102011201220132014201520162017201820192020202120222023202420252026202720282029203020312032203320342035203620372038203920402041204220432044

C

u

m

ulativ

e

d

eciv

e

w im

p

act of N

G

S

o

n

1

1

Class I Are

as

Year

Anticipated Visibility Impact of NGS on 11 Class I Areas: BART and TWG 

BART

TWG A1

TWG A2

TWG A3

TWG is better than BART

BART is better than TWG

TWG is better than BART

LNB/SOFA 

Credit

TWG Step 3: Two 

units meet 0.07 

lb./MMBtu limit

TWG Step 2: Closure or 

Curtailment

TWG Step 1: Early

install of LNB/SOFA

BART: Three 

units meet 0.055 

lb/MMBtu limit