**Danskammer Unit 4** March 2012

**EPA analysis of cost-effectiveness and visibility improvements based on Dynegy BART analysis**

**=============================================================================================== SO2**  **Lime Based Spray Dryer FGD with Baghouse emission rate**  lb/hr tons/yrmmBTU/hr **lb/mmBTU** from Dynegy spreadsheet-------- 234.9 1028.9 2512 **0.094**

from Dynegy spreadsheet--------annualized costs $20,371,635

maximum 8th dv dv Class I Areas improvement $/dv improvement Lye Brook Wilderness Area, VT 0.338$60,271,109 0.677 Acadia National Park, ME 0.701 $29,060,820 0.337 Brigantine Wilderness Area, NJ 1.423 $14,315,977 0.416 Presidential Range Wilderness Area, NH 0.843 $24,165,641 0.278 Great Gulf Wilderness Area, NH 0.756$26,946,607 0.242 Dolly Sods Wilderness Area, WV 0.358$56,904,008 0.116 Otter Creek Wilderness Area, WV 0.33 $61,732,227 0.108 Total 4.749 $4,289,668 **2.174**

**=============================================================================================== SO2**  **0.50 lb SO2/mmBTU proposed BART limit emission rate**  lb/hr tons/yrmmBTU/hr **lb/mmBTU** from Dynegy spreadsheet-------- 1256 5501.3 2512 **0.500**

from Dynegy spreadsheet--------annualized costs $11,108,177

maximum 8th dv dv Class I Areas improvement $/dv improvement Lye Brook Wilderness Area, VT 0.511 $21,738,115 0.245 Acadia National Park, ME 0.301 $36,904,243 0.169 Brigantine Wilderness Area, NJ 0.667$16,653,939 0.22 Presidential Range Wilderness Area, NH 0.462 $24,043,673 0.119 Great Gulf Wilderness Area, NH 0.416$26,702,349 0.135 Dolly Sods Wilderness Area, WV 0.209 $53,149,172 0.067 Otter Creek Wilderness Area, WV 0.193 $57,555,321 0.06 Total 2.759 $4,026,161 **1.015**

**=============================================================================================== SO2**  **Gas Cofiring at 60% emission rate**  lb/hr tons/yrmmBTU/hr **lb/mmBTU** from Dynegy spreadsheet-------- 1075.8 4712.0 2512 **0.428**

from Dynegy spreadsheet--------annualized costs $15,315,564maximum 8th dv dv Class I Areas improvement $/dv improvement Lye Brook Wilderness Area, VT 1.102 $13,897,971 0.42 Acadia National Park, ME 0.506$30,267,913 0.239 Brigantine Wilderness Area, NJ 0.985 $15,548,796 0.307 Presidential Range Wilderness Area, NH 0.646$23,708,303 0.206 Great Gulf Wilderness Area, NH 0.577$26,543,438 0.192 Dolly Sods Wilderness Area, WV 0.287$53,364,334 0.083 Otter Creek Wilderness Area, WV 0.261 $58,680,322 0.075 Total 4.364 $3,509,524 **1.522**

**=============================================================================================== Nox**  **0.12 lb NOx/mmBTU proposed BART limit** (same as gas cofiring 100% @ 0.12 lb/mmBTU) **emission rate** lb/hr tons/yrmmBTU/hr **lb/mmBTU** from Dynegy spreadsheet-------- 301.4 1320.1 2512 **0.120**

from Dynegy spreadsheet--------annualized costs $20,094,818

maximum 8th dv dv Class I Areas improvement $/dv improvement Lye Brook Wilderness Area, VT 0.829 $24,239,829 0.23 Acadia National Park, ME 0.300$66,982,727 0.116 Brigantine Wilderness Area, NJ 0.221 $90,926,778 0.122 Presidential Range Wilderness Area, NH 0.227$88,523,427 0.029 Great Gulf Wilderness Area, NH 0.200$100,474,090 0.063 Dolly Sods Wilderness Area, WV 0.090$223,275,756 0.004 Otter Creek Wilderness Area, WV 0.076$264,405,500 0.005 Total 1.943 $10,342,161 **0.569**

**=============================================================================================== Nox**  **FGR emission rate**  lb/hr tons/yrmmBTU/hr **lb/mmBTU** from Dynegy spreadsheet-------- 970.6 4251.2 2512 **0.386**

from Dynegy spreadsheet--------annualized costs $348,655

maximum 8th dv dv Class I Areas improvement $/dv improvement Lye Brook Wilderness Area, VT 0.091 $3,831,374 0.034 Acadia National Park, ME 0.033 $10,565,303 0.014 Brigantine Wilderness Area, NJ 0.025 $13,946,200 0.019 Presidential Range Wilderness Area, NH 0.026$13,409,808 0.015Great Gulf Wilderness Area, NH 0.022 $15,847,955 0.002

Dolly Sods Wilderness Area, WV 0.010$34,865,500 0 Otter Creek Wilderness Area, WV 0.008$43,581,875 0 Total 0.215 $1,621,651 **0.084**

**=============================================================================================== Nox**  **FGR + SCR emission rate**  lb/hr tons/yrmmBTU/hr **lb/mmBTU** from Dynegy spreadsheet-------- 962.7 4216.6 2512 **0.383**

from Dynegy spreadsheet--------annualized costs $8,458,077

maximum 8th dv dv Class I Areas improvement $/dv improvement Lye Brook Wilderness Area, VT 1.062 $7,964,291 0.243 Acadia National Park, ME 0.383 $22,083,752 0.146 Brigantine Wilderness Area, NJ 0.281 $30,099,918 0.136 Presidential Range Wilderness Area, NH 0.288$29,368,323 0.033 Great Gulf Wilderness Area, NH 0.254$33,299,516 0.08 Dolly Sods Wilderness Area, WV 0.113 $74,850,239 0.005 Otter Creek Wilderness Area, WV 0.096$88,104,969 0.008 Total 2.477 $3,414,646 **0.651**

**=============================================================================================== Nox**  **Hybrid SNCR/SCR emission rate**  lb/hr tons/yrmmBTU/hr **lb/mmBTU** from Dynegy spreadsheet-------- 422 1848.4 2512 **0.168**

from Dynegy spreadsheet--------annualized costs $9,296,984

maximum 8th dv dv Class I Areas improvement $/dv improvement Lye Brook Wilderness Area, VT 0.942 $9,869,410 0.273 Acadia National Park, ME 0.323 $28,783,232 0.126 Brigantine Wilderness Area, NJ 0.344$27,026,116 0.138 Presidential Range Wilderness Area, NH 0.242 $38,417,289 0.053 Great Gulf Wilderness Area, NH 0.213 $43,647,812 0.078 Dolly Sods Wilderness Area, WV 0.097$95,845,196 0.012 Otter Creek Wilderness Area, WV 0.083$112,011,855 0.009 Total 2.244 $4,143,041 **0.689**

**=============================================================================================== Nox**  **Gas Cofiring at 100% @ 0.08 lb/mmBTU emission rate**  lb/hr tons/yrmmBTU/hr **lb/mmBTU** from Dynegy spreadsheet-------- 201 880.4 2512 **0.080**

from Dynegy spreadsheet--------annualized costs $25,525,939

maximum 8th dv dv Class I Areas improvement $/dv improvement Lye Brook Wilderness Area, VT 2.430$10,504,502 0.888 Acadia National Park, ME 1.026$24,879,083 0.448 Brigantine Wilderness Area, NJ 1.815 $14,063,878 0.551 Presidential Range Wilderness Area, NH 1.219 $20,940,065 0.391 Great Gulf Wilderness Area, NH 1.085 $23,526,211 0.349 Dolly Sods Wilderness Area, WV 0.527$48,436,317 0.139 Otter Creek Wilderness Area, WV 0.475 $53,738,819 0.13 Total 8.577 $2,976,092 **2.896 ===============================================================================================** 

$/dv $30,091,041 $60,449,955 $48,970,276 $73,279,263 $84,180,310 $175,617,543 $188,626,250 **$9,370,577**

**===============================================================================================**

$/dv $45,339,498 $65,728,858 $50,491,714 $93,346,025 $82,282,793 $165,793,687 $185,136,283 **$10,944,017**

**===============================================================================================**$/dv

$36,465,629 $64,081,858 $49,887,831 $74,347,398 $79,768,563 $184,524,867 $204,207,520 **$10,062,788**

**===============================================================================================** (same as gas cofiring 100% @ 0.12 lb/mmBTU)

$/dv $87,368,774 $173,231,190 $164,711,623 $692,924,759 $318,965,365 $5,023,704,500 $4,018,963,600 **$35,316,025**

**===============================================================================================**

$/dv $10,254,559 $24,903,929 $18,350,263 $23,243,667$174,327,500

**$4,150,655**

**===============================================================================================**

$/dv $34,806,901 $57,932,034 $62,191,743 $256,305,364 $105,725,963 $1,691,615,400 $1,057,259,625 **$12,992,438**

**===============================================================================================**

$/dv $34,054,886 $73,785,587 $67,369,449 $175,414,792 $119,192,103 $774,748,667 $1,032,998,222 **$13,493,446**

**===============================================================================================**$/dv

$28,745,427 $56,977,542 $46,326,568 $65,283,731 $73,140,226 $183,639,849 $196,353,377 **$8,814,205**