**Expected Control - Original Low Dust U1**  **Low Dust U2 Tail End U1**  **Tail End U2** Original Emission Rate lb/MMBTU 0.849 0.786 0.849 0.786 Original Heat Rate MMBTU/hr 2744 4885 2774 4885 Original Emissions lb/hr (U1 2744 MMBTU/hr; U2 4885 MMBTU/hr) 2330 3840 2355 3840 Original Availability percent 97.30% 93.90% 97.30% 93.90% Original Annual tons/y r 9928 15792 10037 15792 New Em ission Rate lb/MMBTU 0.053 0.049 0.053 0.049 Hourly Em ission lbs/hr 145 239 145 239 Control Percentage 93.8% 93.8% 93.8% 93.8% Annual Em ission Scenario A tons/y r 586 931 589 936 Scenario B tons/y r 533 813 536 813 Em ission Reduction Scenario A tons/y r 9348 14862 9345 14857 Scenario B tons/y r 9401 14980 9398 14980 **Source: November 2009 Minnkota Submittals. Expected Control - ERG Revision (accounts for changes in availability)**  Annual Em ission Scenario 1 tons/y r 612 967 619 967 Scenario 2 tons/y r 616 976 623 976 Scenario 3 tons/y r 620 984 627 984 Scenario 4 tons/y r 606 963 613 963 Scenario 4 Em ission Reduction Scenario 1 tons/y r 9316 14825 9418 14825 Scenario 2 tons/y r 9312 14816 9414 14816 Scenario 3 tons/y r 9309 14807 9410 14807 Scenario 4 tons/y r 9322 14829 9424 14829 Source: Annual cost sheet revisions assumptions. Use new unit availability based on less downtime.

1000$ **Capital Costs Low Dust U1**  **Low Dust U2 Tail End U1**  **Tail End U2** Minnkota Original costs (2018 $) $183,274 $317,429 $240,817 $411,063 Original costs (2009 $) $146,753 $254,175 $192,830 $329,150 Capital_Revised OAQPS New equipm ent costs + Hy bird of Minnkota and OAQPS Assumptions $93,023 $166,346 $123,129 $216,867 **An nual Costs**  **Description Low Dust U1**  **Low Dust U2 Tail End U1**  **Tail End U2** Minnkota (Reported in 2006$) Original costs Scenario A 1 layer every 2 years $33,526 $57,351 $39,307 $66,507 Scenario B 1 layer 3-4 times per year $45,245 $86,542 $50,937 $96,268OAQPS (Reported in 2009$) New catalyst info + Hy bird of Minnkota and OAQPS Assumptions Scenario 1 1 layer every year $20,070 $34,456 $23,372 $39,788 Scenario 2 1 layer every 2 years $19,032 $32,319 $22,569 $38,047 Scenario 3 1 layer every 3 years $18,398 $30,866 $22,015 $36,730 Scenario 4 ASOFA assumption $20,767 $33,712 $24,064 $39,041

**Total A nnualized Costs (2009$)**  **Updated cost factor to CEPCI: 2006 = 0.957 *** **2009 (2009 = 521.9; 2006 = 499.6) Low Dust U1**  **Low Dust U2 Tail End U1**  **Tail End U2 Cost Factor**  **0.957 Minnkota**  **Original costs** Scenario A 1 layer every 2 years (2009$) $35,033 $59,928 $41,073 $69,495 Scenario B 1 layer 3-4 times per year (2009$) $47,277 $90,430 $53,226 $100,594 North Dakota Avg **OA QPS**  **New equipment and catalyst info with OA QPS**  **assumptions where applicable** Scenario 1 1 layer every year $20,070 $34,456 $23,372 $39,788 Scenario 2 1 layer every 2 years $19,032 $32,319 $22,569 $38,047 Scenario 3 1 layer every 3 years $18,398 $30,866 $22,015 $36,730 Scenario 4 ASOFA assumption $20,767 $33,712 $24,064 $39,041 Assumed Minnkota's annualized cost factors for capital. Total Annualized costs = Annual O&M + Total Capital * 0.08718. Assumed annual costs are in 2009 dollars. **1000$**

**Include Cost of Overfire air Minnkota U1 Document, November 2009, Revised February 2010**  ASOFA, Installed Capital 2006$ $4,277,000 Table4-4SF ASOFA, Annualized Capital 2006$ $373,000 Table4-4SF ASOFA, Annual O&M 2006$ $1,695,000 Table4-6SF **Minnkota U2 Document, November 2009** ASOFA, Installed Capital 2006$ $10,008,000 Table4-4SF ASOFA, Annualized Capital 2006$ $873,000 Table4-4SF ASOFA, Annual O&M 2006$ $2,805,000 Table4-6SF **Total A nnualized Costs, 2006$**  Unit 1, Annualized 2006$ $2,068,000 Annualized capital + annual O&M Unit 2, Annualized 2006$ $3,678,000 Annualized capital + annual O&M**Total A nnualized Costs, 2009$**  **Convert to 2009 $** Unit 1, Annualized 2009$ $2,160,920 Unit 2, Annualized 2009$ $3,843,260

**Total A nnualized Costs (2009)**  **Ad ded OFA**  **costs provided by EPA to the total**  **annualized costs (added cells B72 or B73 to the values in the 2009 annualized cost table)**  **Low Dust U1 Low Dust U2**  **Tail End U1 Tail End U2**  **Minnkota Original costs**  Scenario A 1 layer every 2 years (2009$) $37,194 $63,771 $43,234 $73,338 Scenario B 1 layer 3-4 times per year (2009$) $49,438 $94,273 $55,387 $104,437 North Dakota Avg **ERG New equipment and catalyst info with OA** **QPS assumptions where applicable**  Scenario 1 1 layer every year $22,231 $38,299 $25,533 $43,631 Scenario 2 1 layer every 2 years $21,193 $36,162 $24,730 $41,890 Scenario 3 1 layer every 3 years $20,559 $34,710 $24,176 $40,573 Scenario 4 ASOFA assumption $22,928 $37,555 $26,225 $42,885
**Costs in 2006 Dollars (Multiply 2009 costs by B53)** 1000$ **1000$**

**Capital Costs Low Dust U1**  **Low Dust U2 Tail End U1**  **Tail End U2** Minnkota Original costs $140,443 $243,245 $184,538 $314,997 Capital_Revised OAQPS New equipm ent costs + Hy bird of Minnkota and OAQPS Assumptions $89,023 $159,193 $117,834 $207,541 **An nual Costs**  **Description Low Dust U1**  **Low Dust U2 Tail End U1**  **Tail End U2 Minnkota**  Original costs Scenario A 1 layer every 2 years $33,526 $57,351 $39,307 $66,507 Scenario B 1 layer 3-4 times per year $45,245 $86,542 $50,937 $96,268

**OA QPS**  New catalyst info + Hy bird of Minnkota and OAQPS Assumptions Scenario 1 1 layer every year $19,207 $32,974 $22,367 $38,077 Scenario 2 1 layer every 2 years $18,213 $30,929 $21,598 $36,411 Scenario 3 1 layer every 3 years $17,607 $29,539 $21,069 $35,151 Scenario 4 ASOFA assumption $19,874 $32,262 $23,029 $37,362 **Total A nnualized Costs**  **Low Dust U1 Low Dust U2**  **Tail End U1 Tail End U2**  **1000$ Minnkota**  **Original costs** Scenario A 1 layer every 2 years $33,526 $57,351 $39,307 $66,507 Scenario B 1 layer 3-4 times per year $45,245 $86,542 $50,937 $96,268 North Dakota Avg **OA QPS**  **New equipment and catalyst info with OA QPS**  **assumptions where applicable** Scenario 1 1 layer every year $19,207 $32,974 $22,367 $38,077 Scenario 2 1 layer every 2 years $18,213 $30,929 $21,598 $36,411 Scenario 3 1 layer every 3 years $17,607 $29,539 $21,069 $35,151 Scenario 4 ASOFA assumption $19,874 $32,262 $23,029 $37,362

**Total A nnualized Costs (2006)**  **Ad ded OFA**  **costs provided by EPA to the total**  **annualized costs (added cells B102 or B103 to the values in the 2006 annualized cost table)**  **Low Dust U1 Low Dust U2**  **Tail End U1 Tail End U2**  **Minnkota Original costs**  Scenario A 1 layer every 2 years $35,594 $61,029 $41,375 $70,185 Scenario B 1 layer 3-4 times per year $47,313 $90,220 $53,005 $99,946 North Dakota Avg **OA QPS**  **New equipment and catalyst info with OA QPS**  **assumptions where applicable** Scenario 1 1 layer every year $21,275 $36,652 $24,435 $41,755 Scenario 2 1 layer every 2 years $20,281 $34,607 $23,666 $40,089 **1000$**

Scenario 2 1 layer every 2 years $20,281 $34,607 $23,666 $40,089 Scenario 3 1 layer every 3 years $19,675 $33,217 $23,137 $38,829 Scenario 4 ASOFA assumption $21,942 $35,940 $25,097 $41,040**Reduction from Original Low Dust U1**  **Low Dust U2 Tail End U1**  **Tail End U2**

36.61% 34.55% 36.15% 34.11%**Low Dust U1 Low Dust U2**  **Tail End U1 Tail End U2** 

$3,748 $4,032 $4,395 $4,678 $5,029 $6,037 $5,664 $6,715 $4,388 $5,035 $5,029 $5,696
$2,154 $2,324 $2,482 $2,684 $2,044 $2,181 $2,397 $2,568 $1,976 $2,085 $2,339 $2,481 $2,228 $2,273 $2,553 $2,633

**Costs in $/ton removed Low Dust U1**  **Low Dust U2 Tail End U1**  **Tail End U2**

$3,979 $4,291 $4,626 $4,936 $5,259 $6,293 $5,893 $6,972

$2,386 $2,583 $2,711 $2,943 $2,276 $2,441 $2,627 $2,827 $2,209 $2,344 $2,569 $2,740 $2,459 $2,533 $2,783 $2,892

**Costs in $/ton removed**

**Low Dust U1 Low Dust U2**  **Tail End U1 Tail End U2** 

**Costs in $/ton removed**$3,586 $3,859 $4,206 $4,476

$4,813 $5,777 $5,420 $6,426 $4,200 $4,818 $4,813 $5,451
$2,062 $2,224 $2,375 $2,568 $1,956 $2,088 $2,294 $2,458 $1,891 $1,995 $2,239 $2,374 $2,132 $2,176 $2,444 $2,520

**Low Dust U1 Low Dust U2**  **Tail End U1 Tail End U2** 

$3,808 $4,106 $4,427 $4,724 $5,033 $6,023 $5,640 $6,672

$2,284 $2,472 $2,594 $2,817 $2,178 $2,336 $2,514 $2,706

**Costs in $/ton removed**

$2,114 $2,243 $2,459 $2,622 $2,354 $2,424 $2,663 $2,768**Expected Control - Original Low Dust U1** 

Original Emission Rate Original Emissions Original Annual tons/y r 9,032 New Em ission Rate lb/MMBTU 0.053 Hourly Em ission lbs/hr Control Percentage Annual Em ission Scenario A tons/y r 586 Scenario B tons/y r 533 Em ission Reduction Scenario A tons/y r 8446 Scenario B tons/y r 8499 Source: November 2009 Minnkota Submittals. **Expected Control - ERG Revision (accounts for changes in availability)** Annual Em ission Scenario 1 tons/y r 612 Scenario 2 tons/y r 616 Scenario 3 tons/y r 620 Scenario 4 tons/y r 606 Em ission Reduction Scenario 1 tons/y r 8420 Scenario 2 tons/y r 8416 Scenario 3 tons/y r 8412 Scenario 4 tons/y r 8426 Source: Annual cost sheet revisions assumptions. Use new unit availability based on less downtime.

1000$ **Capital Costs Low Dust U1**  Minnkota Original costs (2018 $) $183,274 Original costs (2009 $) $146,753 Capital_Revised OAQPS New equipm ent costs + Hy bird of Minnkota and OAQPS Assumptions $93,023 **An nual Costs**  **Description Low Dust U1**  Minnkota (Reported in 2006$) Original costs Scenario A 1 layer every 2 years $33,526 Scenario B 1 layer 3-4 times per year $45,245 OAQPS (Reported in 2009$) New catalyst info + Hy bird of Minnkota and OAQPS Assumptions Scenario 1 1 layer every year $20,070 Scenario 2 1 layer every 2 years $19,032 Scenario 3 1 layer every 3 years $18,398 Scenario 4 ASOFA assumption $20,767

**Total A nnualized Costs (2009$)**  **Updated cost factor to CEPCI: 2006 = 0.957 *** **2009 (2009 = 521.9; 2006 = 499.6) Low Dust U1**  **Cost Factor 0.957**  **Minnkota Original costs** Scenario A 1 layer every 2 years (2009$) $35,033 Scenario B 1 layer 3-4 times per year (2009$) $47,277 North Dakota Avg **ERG New equipment and catalyst info with OA** **QPS assumptions where applicable**  Scenario 1 1 layer every year $20,070 Scenario 2 1 layer every 2 years $19,032 Scenario 3 1 layer every 3 years $18,398 Scenario 4 ASOFA assumption $20,767 Assumed Minnkota's annualized cost factors for capital. Total Annualized costs = Annual O&M + Total Capital * 0.08718. Assumed annual costs are in 2009 dollars. **Include Cost of Overfire air Minnkota U1 Document, November 2009, Revised February 2010**  ASOFA, Installed Capital 2006$ $4,277,000 Table4-4SF ASOFA, Annualized Capital 2006$ $373,000 Table4-4SF ASOFA, Annual O&M 2006$ $1,695,000 Table4-6SF **Minnkota U2 Document, November 2009** ASOFA, Installed Capital 2006$ $10,008,000 Table4-4SF ASOFA, Annualized Capital 2006$ $873,000 Table4-4SF ASOFA, Annual O&M 2006$ $2,805,000 Table4-6SF **Total A nnualized Costs, 2006$**  Unit 1, Annualized 2006$ $2,068,000 Annualized capital + annual O&M Unit 2, Annualized 2006$ $3,678,000 Annualized capital + annual O&M **Total A nnualized Costs, 2009$**  **Convert to 2009 $** Unit 1, Annualized 2009$ $2,160,920 Unit 2, Annualized 2009$ $3,843,260

**Total A nnualized Costs (2009)**  **Ad ded OFA**  **costs provided by EPA to the total**  **annualized costs (added cells B72 or B73 to the values in the 2009 annualized cost table)**  **Low Dust U1 Minnkota**  **Original costs** Scenario A 1 layer every 2 years (2009$) $37,194 Scenario B 1 layer 3-4 times per year (2009$) $49,438 North Dakota Avg **ERG New equipment and catalyst info with OA** **QPS assumptions where applicable**  Scenario 1 1 layer every year $22,231 Scenario 2 1 layer every 2 years $21,193 Scenario 3 1 layer every 3 years $20,559 Scenario 4 ASOFA assumption $22,928**Costs in 2006 Dollars (Multiply 2009 costs by B53)** 1000$

**Capital Costs Low Dust U1**  Minnkota Original costs $140,443 Capital_Revised OAQPS New equipm ent costs + Hy bird of Minnkota and OAQPS Assumptions $89,023 **An nual Costs**  **Description Low Dust U1**  Minnkota Original costs Scenario A 1 layer every 2 years $33,526 Scenario B 1 layer 3-4 times per year $45,245 OAQPS New catalyst info + Hy bird of Minnkota and OAQPS Assumptions Scenario 1 1 layer every year $19,207 Scenario 2 1 layer every 2 years $18,213 Scenario 3 1 layer every 3 years $17,607 Scenario 4 ASOFA assumption $19,874 **Total A nnualized Costs**  **Low Dust U1 Minnkota**  **Original costs** Scenario A 1 layer every 2 years $33,526 Scenario B 1 layer 3-4 times per year $45,245 North Dakota Avg **ERG New equipment and catalyst info with OA** **QPS assumptions where applicable**  Scenario 1 1 layer every year $19,207 Scenario 2 1 layer every 2 years $18,213 Scenario 3 1 layer every 3 years $17,607 Scenario 3 er every $17,607 Scenario 4 ASOFA assumption $19,874

**Total A nnualized Costs (2006)**  **Ad ded OFA**  **costs provided by EPA to the total**  **annualized costs (added cells B102 or B103 to the values in the 2006 annualized cost table)**  **Low Dust U1 Minnkota**  **Original costs** Scenario A 1 layer every 2 years $35,594 Scenario B 1 layer 3-4 times per year $47,313 North Dakota Avg **ERG New equipment and catalyst info with OA** **QPS assumptions where applicable**  Scenario 1 1 layer every year $21,275 Scenario 2 1 layer every 2 years $20,281 Scenario 3 1 layer every 3 years $19,675 Scenario 4 ASOFA assumption $21,942**Low Dust U2 Tail End U1**  **Tail End U2**

15,507 9,032 15,507 0.049 0.053 0.049

931 589 936 813 536 813 14576 8443 14571 14694 8496 14694

967 619 967 976 623 976 984 627 984 963 613 963 14540 8413 14540 14531 8409 14531 14523 8405 14523 14544 8419 14544
**Reduction from Original Low Dust U2**  **Tail End U1 Tail End U2**  **Low Dust U1 Low Dust U2**  **Tail End U1** $317,429 $240,817 $411,063 $254,175 $192,830 $329,150 $166,346 $123,129 $216,867 36.61% 34.55% 36.15% **Low Dust U2 Tail End U1**  **Tail End U2** $57,351 $39,307 $66,507 $86,542 $50,937 $96,268
$34,456 $23,372 $39,788 $32,319 $22,569 $38,047 $30,866 $22,015 $36,730 $33,712 $24,064 $39,041

**Low Dust U2 Tail End U1**  **Tail End U2 Low Dust U1**  **Low Dust U2 Tail End U1** 

**1000$ Costs in $/ton removed** $59,928 $41,073 $69,495 $4,148 $4,111 $4,865

$90,430 $53,226 $100,594 $5,563 $6,154 $6,265 $4,855 $5,133 $5,565
$34,456 $23,372 $39,788 $2,384 $2,370 $2,778 $32,319 $22,569 $38,047 $2,261 $2,224 $2,684 $30,866 $22,015 $36,730 $2,187 $2,125 $2,619 $33,712 $24,064 $39,041 $2,465 $2,318 $2,858 Assumed Minnkota's annualized cost factors for capital. Total Annualized costs = Annual O&M + Total Capital * 0.08718.

**Low Dust U2 Tail End U1**  **Tail End U2 Low Dust U1**  **Low Dust U2 Tail End U1** 
$63,771 $43,234 $73,338 $4,404 $4,375 $5,121 $94,273 $55,387 $104,437 $5,817 $6,416 $6,519

$38,299 $25,533 $43,631 $2,640 $2,634 $3,035 $36,162 $24,730 $41,890 $2,518 $2,489 $2,941 $34,710 $24,176 $40,573 $2,444 $2,390 $2,876 $37,555 $26,225 $42,885 $2,721 $2,582 $3,115 **1000$ Costs in $/ton removed** **Low Dust U2 Tail End U1**  **Tail End U2**

$243,245 $184,538 $314,997 $159,193 $117,834 $207,541 **Low Dust U2 Tail End U1**  **Tail End U2** $57,351 $39,307 $66,507 $86,542 $50,937 $96,268
$32,974 $22,367 $38,077 $30,929 $21,598 $36,411 $29,539 $21,069 $35,151 $32,262 $23,029 $37,362 **Low Dust U2 Tail End U1**  **Tail End U2 Low Dust U1**  **Low Dust U2 Tail End U1** 
$57,351 $39,307 $66,507 $3,970 $3,935 $4,656 $86,542 $50,937 $96,268 $5,324 $5,890 $5,995 $4,647 $4,912 $5,325
$32,974 $22,367 $38,077 $2,281 $2,268 $2,659 $30,929 $21,598 $36,411 $2,164 $2,128 $2,568 $29,539 $21,069 $35,151 $2,093 $2,034 $2,507 **1000$ Costs in $/ton removed** 

$29,539 $21,069 $35,151 $2,093 $2,034 $2,507 $32,262 $23,029 $37,362 $2,359 $2,218 $2,735

**Low Dust U2 Tail End U1**  **Tail End U2 Low Dust U1**  **Low Dust U2 Tail End U1** 
$61,029 $41,375 $70,185 $4,214 $4,187 $4,900 $90,220 $53,005 $99,946 $5,567 $6,140 $6,239

$36,652 $24,435 $41,755 $2,527 $2,521 $2,904 $34,607 $23,666 $40,089 $2,410 $2,382 $2,814 $33,217 $23,137 $38,829 $2,339 $2,287 $2,753 $35,940 $25,097 $41,040 $2,604 $2,471 $2,981 **1000$ Costs in $/ton removed** **Tail End U2**

34.11%

**Tail End U2**$4,769

$6,846 $5,808
$2,736 $2,618 $2,529 $2,684

**Tail End U2**
$5,033 $7,107

$3,001 $2,883 $2,794 $2,949**Tail End U2**

$4,564 $6,552 $5,558
$2,619 $2,506 $2,420 $2,569

**Tail End U2**
$4,817 $6,802

$2,872 $2,759 $2,674 $2,822**Minnkota Costs - Shared**

Item DIRECT CAPITAL COSTS Low Dust U1 Low Dust U2 Tail End U1 (1) Purchased Capital Equipment (a) SCR System Equipment - Capital Cost

of SCR System $29,738,389 $52,565,778 $38,796,814 Capital Cost of Spare Catalyst
(b) Auxillaries/Balance of Plant $23,756,987 $40,894,045 $33,414,080 (c) Instruments and controls (d) Taxes (e) Freight

**PURCHA SED CA**  **PITA L EQUIPMENT**  **COSTS - TOTA L**  **$53,495,376 $93,459,823**  **$72,210,894** (2) Construction Costs (a) Foundations and supports $15,097,939 $28,304,959 $20,041,826 (b) Urea storage building (c) Electrical $6,901,578 $13,809,256 $7,690,294 (d) Mechanical/piping $2,411,613 $4,718,286 $2,513,213 (e) Insulation $3,195,016 $4,686,967 $5,350,536 (f) Painting

DIRECT CAPITAL CONSTRUCTION COSTS - TOTAL $27,606,146 $51,519,468 $35,595,869

**DIRECT CA PITA**  **L COSTS TOTA L**  **$81,101,522 $144,979,291**  **$107,806,763**

INDIRECT CAPITAL COSTS (3) Indirect Installation Costs (a) Engineering and Field Support $12,165,228 $21,746,894 $16,171,014 (b) Construction Mgt & Indirects $3,244,061 $5,799,172 $4,312,270 (c) Startup Expenses $1,582,000 $2,938,000 $1,582,000 (d) Scope Contingency $12,486,493 $21,567,604 $16,536,353 (4) Other Indirect Costs (a) Pricing Contingency $12,486,493 $21,567,604 $16,536,353

**INDIRECT INSTA LLA** 

**TION COSTS - TOTA**  **L $41,964,275**  **$73,619,274 $55,137,990**  (5) Cost Escalation during Project $26,772,124 $40,212,687 $35,491,483(6) Interest During Construction $17,441,200 $30,047,900 $23,097,900

(7) Natural Gas Pipeline - Installed $2,362,500 $4,387,500 $2,362,500 (8) Owner's Costs - Other $13,632,335 $24,182,077 $16,920,540

**TOTA L CA**  **PITA L INVESTMENT**  **(2018$) $183,273,956**  **$317,428,729 $240,817,176**  **TOTA L CA**  **PITA L INVESTMENT**  **(2009$) $146,752,955**  **$254,174,706 $192,829,537**  **SCR COSTS (2009$) $23,812,420**  **$42,090,995 $31,065,773** 

1 8 2009 Costs - Minnkota's costs are in 2018 dollars. ERG back-calculated the 2009 costs using the Present Value Factor of 0.80073, listed in Minnkota's documentation.

Includes site excavation, structural steel, concrete, and architechtural construction costs. Includes SCR by pass ducts and isolation dam pers, and interconnecting ductwork construction costs. Follows SCR Chapter of EPA Cost Control Manual - Minnkota did not use manual for estimating electrical power consumption, reagent usage, and catalyst replacements.

Inculdes catalyst, flue gas heat recovery equipm ent, and flue gas reheat burner equipment and mechanical setting of equipm ent.Tail End U2 Notes Low Dust U1 Low Dust U2 Tail End U1

$70,418,628 1

2
$52,307,775 3 Auxillaries/Balance of Plant 79.9% 77.8% 86.1%

4 5 6 **$122,726,403** 7 Construction Costs $39,631,284 8 Foundations and supports 28.2% 30.3% 27.8%

9 Urea storage building $15,296,131 10 Electrical 12.9% 14.8% 10.6% $4,995,255 11 Mechanical/piping 4.5% 5.0% 3.5% $7,143,550 12 Insulation 6.0% 5.0% 7.4%

13 Painting
$67,066,220 14 **DIRECT CA PITA**  **L CONSTRUCTION COSTS - TOTA**  **L PERCENT 51.6%**  **55.1% 49.3%** 
**$189,792,623** 15

INDIRECT CAPITAL COSTS Indirect Installation Costs $28,468,894 16 Engineering and Field Support 15.0% 15.0% 15.0% $7,591,705 17 Construction Mgt & Indirects 4.0% 4.0% 4.0% $2,938,000 18 Startup Expenses 2.0% 2.0% 1.5% $28,151,800 19 Scope Contingency 15.4% 14.9% 15.3% Other Indirect Costs $28,151,800 20 Pricing Contingency 15.4% 14.9% 15.3% **$95,302,199 INDIRECT INSTA**  **LLA TION COSTS -**  **TOTA L PERCENT**  **51.7% 50.8%**  **51.1%** $52,726,778 22 Cost Escalation during Project 21.8% 18.4% 21.8% **TA BLE A**  **. Calculated Percentages Based on Minnkota's Estimate**$39,221,000 23 Interest During Construction 14.2% 13.7% 14.2%

$4,387,500 24 Natural Gas Pipeline - Installed 1.9% 2.0% 1.4% $29,632,862 25 Owner's Costs - Other 11.1% 11.1% 10.4%
**$411,062,962** 26 **TOTA L CA**  **PITA L INVESTMENT**  **48.9% 45.2%**  **47.8% $329,150,446**  **$56,386,308**

2009 Costs - Minnkota's costs are in 2018 dollars. ERG back-calculated the 2009 costs using the Present Value Factor of 0.80073,

Includes site excavation, structural steel, concrete, and architechtural construction costs. Includes SCR by pass ducts Follows SCR Chapter of EPA Cost Control Manual - Minnkota did not use manual for estimating electrical power

Inculdes catalyst, flue gas heat recovery equipm ent, and flue gas reheat burner equipment and mechanical setting of**TA BLE B1. EPA**  **Cost Control Manual** Tail End U2 Percent of Avg % Cost Item Percent of

74.3% SCR Equipm ent 79.5%

32.3% Capital Equipm ent 29.6% 12.5% Capital Equipm ent 12.7% 4.1% Capital Equipm ent 4.3% 5.8% Capital Equipm ent 6.1%

**54.6%**

15.0% Total Capital 15.0% Eng & Hom e Office 10% Total Capital 4.0% Total Capital 4.0% Gen. Facilities 5% Total Capital 1.5% Total Capital 1.7% 14.8% Total Capital 15.1% Process Contingency 5% Total Capital

14.8% Total Capital 15.1% **50.2% Total**  **20% Ap**  **plied to Capital** 18.5% Capital + Indirect 20.1% Contingency 15% Capital + Indirect13.8% Capital + Indirect 14.0%

1.5% Capital + Indirect 1.7% 10.4% Capital + Indirect 10.7% 46.5% **44.2% Total**  **15% Ap**  **plied to C + I**

**Preproduction 2%**  **Total Plant (applied to C + I + Contingency)** 
**Inventory capital (ammonia) vol (gal) x cost ($/gal)** Cost Item Percent of Equipm ent Costs Notes

Auxillaries/Balance of Plant 55% Perry's lists costs as percent of total equipment (SCR costs)

Construction Costs Foundations and supports 18% Urea storage building Electrical 18% Mechanical/piping 29% Insulation 11% Value from Perry's is Insulation painting Painting DIRECT CAPITAL CONSTRUCTION COSTS - TOTAL **76%** Factor to Apply

to Equipm ent Costs **131%** Equipm ent*(0.55+0.76) **Total Direct = SCR+SCR*1.31 = SCR(2.31) (Perry's)** **Total Direct = (SCR*1.80)+(SCR*1.80*0.50) = SCR(2.7) (Minnkota)**

INDIRECT CAPITAL COSTS Percent of Total Plant Costs Perry's lists costs as percent of total equipment (SCR costs). % of total direct = cost item percent*SCR/total direct = cost item %/2.31 (direct = 2.31*SCR) Indirect Installation Costs Engineering and Field Support 31% 13% Construction Mgt & Indirects 43% 19% Startup Expenses 0% Scope Contingency 39% 17% Other Indirect Costs (Contractor fees) 17% 7% Pricing Contingency **INDIRECT INSTA LLA** 

**TION COSTS - TOTA**  **L 130%**  **56%** Contingency 39% **17%** Assume apply to plant costs **TA BLE B2. Perry's Chemical Engineering Handbook 6th Edition (Table 25-53 Typical Factors with** **ERG Calculation - New Vendor Information w/Hybrid Minnkota and OA QPS A**  **ssumptions** Item DIRECT CAPITAL COSTS Low Dust U1 Low Dust U2 Tail End U1 Tail End U2 Notes (1) Purchased Capital Equipment (a) SCR System Equipment - Capital Cost of SCR System $23,812,420 $42,090,995 $31,065,773 $56,386,308 1

Capital Cost of Spare Catalyst (b) Auxillaries/Balance of Plant $19,022,932 $32,745,089 $26,755,656 $41,884,405 2 (c) Instruments and controls (d) Taxes (e) Freight

**PURCHA SED CA**  **PITA L EQUIPMENT COSTS -**  **TOTA L**  **$42,835,352 $74,836,084**  **$57,821,429 $98,270,713**  (2) Construction Costs (a) Foundations and supports $12,089,373 $22,664,630 $16,048,091 $31,733,958 (b) Urea storage building (c) Electrical $5,526,301 $11,057,486 $6,157,849 $12,248,071 (d) Mechanical/piping $1,931,051 $3,778,073 $2,012,405 $3,999,851 (e) Insulation $2,558,345 $3,752,995 $4,284,335 $5,720,055 (f) Painting

**DIRECT CA PITA**  **L CONSTRUCTION COSTS - TOTA**  **L** $22,105,069 $41,253,184 $28,502,680 $53,701,934 **DIRECT CA PITA**  **L COSTS - TOTA L**  **$64,940,422 $116,089,268**  **$86,324,109 $151,972,647**  INDIRECT CAPITAL COSTS (3) Indirect Installation Costs (a) Engineering and Hom e Office (OAQPS) $6,494,042 $11,608,927 $8,632,411 $15,197,265 (b) General Facilities (OAQPS) $3,247,021 $5,804,463 $4,316,205 $7,598,632 (c) Startup Expenses (d) Process Contingency (OAQPS) $3,247,021 $5,804,463 $4,316,205 $7,598,632 (4) Other Indirect Costs (a) Pricing Contingency

**INDIRECT INSTA LLA** 

**TION COSTS - TOTA L**  **$12,988,084 $23,217,854**  **$17,264,822 $30,394,529** 
(5) Cost Escalation during Project (6) Interest During Construction (7) Natural Gas Pipeline - Installed $1,495,997 $2,796,038 $1,501,913 $2,806,561 (8) Owner's Costs - Other

Contingency

- OAQPS $11,689,276 $20,896,068 $15,538,340 $27,355,076**TOTA L PLA**  **NT** $91,113,779 $162,999,228 $120,629,184 $212,528,814

Preproduction - OAQPS $1,822,276 $3,259,985 $2,412,584 $4,250,576 Initial Reagent Costs $87,126 $87,126 $87,126 $87,126 ERG-1 **TOTA L CA**  **PITA L INVESTMENT**  **$93,023,181 $166,346,339**  **$123,128,894 $216,866,517** 

1

2

ERG-1 Reagent costs $2006 $379 Minnkota cost, $2006 Cost factor ($2006 = CF * $2009) 0.957 See summary row 52/53 Reagent costs $2009 396 $

Reagent storage tank size, gallons 40,000 Assumed based on FuelTech presentation and need for approximately

1 mo nth storage http://www.ftek.co

m/media/enUS/ppts/2011_EU EC_CUS_ULTRA .pdf Density of urea, lb/gal 11 Initial reagent volum e, tons 220 Minnkota SCR costs in 2009 dollars calculated based on their reported costs in 2018 dollars. Includes SCR system w/gas by pass for maintenance, reactor housing, intial catalyst fill, associated fules and internal flow distribution devices, ammonia injection grid, hoists and monorails for SCR internal maintenance, sonic horns, natural gas reheater, regenerative gas to gas heat exchangers, heat recovery gas to gas heater exchangers (tail end only), associated interconnected piping, freight. Applied percentage to SCR equipment in Table A. Note this may double count some auxillaries since Minnkota SCR system only included costs for SCR with initial catalyst, flue gas heat reheater burner, and mechanical setting of equipment. (Freight is included in both EPA's vendor estimate and Minnkota's estimate).**TA BLE A**  **. Calculated Percentages Based on Minnkota's Estimate** Low Dust U1 Low Dust U2 Tail End U1 Tail End U2 Percent of Cost Item Percent of

79.9% 77.8% 86.1% 74.3% SCR Equipm ent

28.2% 30.3% 27.8% 32.3% Capital Equipm ent 12.9% 14.8% 10.6% 12.5% Capital Equipm ent 4.5% 5.0% 3.5% 4.1% Capital Equipm ent 6.0% 5.0% 7.4% 5.8% Capital Equipm ent

Eng & Hom e Office 10% Total Capital Gen. Facilities 5% Total Capital Process Contingency 5% Total Capital

Contingency 15% Capital + Indirect 1.9% 2.0% 1.4% 1.5% Capital + Indirect **TA BLE B1. EPA**  **Cost Control Manual**Total 15% Applied to C + I

Preproduction 2% Total Plant (applied to C + I + Contingency )**Minnkota Costs - Shared**

Item DIRECT ANNUAL COSTS Low Dust U1 Low Dust U2 Tail End U1 Tail End U2 (1) Annual Maintenance Costs $4,189,181 $7,514,611 $5,444,530 $9,608,381 (2) **An nual Reagent Costs** 

Scenario A $2,710,313 $4,171,528 $2,709,417 $4,170,150 Scenario B $2,725,539 $4,204,613 $2,724,643 $4,204,613

(3) **An nual Electricity Costs** 

Scenario A $5,929,642 $9,730,376 $6,011,088 $9,740,159 Scenario B $11,939,901 $24,539,279 $11,982,549 $25,083,883 (4) Annual W ater Costs**Catalyst Replacement Costs**

(5) Scenario A $709,951 $958,131 $709,951 $963,350

Scenario B $4,387,500 $10,260,000 $4,387,500 $10,260,000

(6) Natural Gas for F.G.

Reheating & Urea-to-Ammonia Conversion sys Scenario A $3,559,912 $6,064,108 $3,931,511 $6,416,128 Scenario B $3,240,879 $5,296,499 $3,580,852 $5,574,558

(7) Operating labor for SCR

equipm ent and urea-toam mo nia equipm ent **DIRECT A NNUA**  **L COSTS - TOTA**  **L Scenario A**  **$17,098,999 $28,438,754**  **$18,806,497 $30,898,168**  **Scenario B $26,483,000**  **$51,815,002 $28,120,074**  **$54,731,435** INDIRECT ANNUAL COSTS
(8) Annual costs from capital

recovery $12,174,396 $21,838,601 $15,822,632 $27,923,414
(9) Adm inistrative overhead,

insurance and property taxes for SCRs and aux. **INDIRECT A NNUA**  **L COSTS - TOTA**  **L $12,174,396**  **$21,838,601 $15,822,632**  **$27,923,414 TOTA**  **L A NNUA**  **L COSTS Scenario A**  **$29,273,395 $50,277,355**  **$34,629,129 $58,821,582**  **Scenario B $38,657,396**  **$73,653,603 $43,942,706**  **$82,654,849 LEVELIZED TOTA**  **L AN**  **NUA LIZED COSTS**  **Scenario A $33,526,429**  **$57,350,926 $39,306,869**  **$66,506,883 Scenario B**  **$45,244,513 $86,541,548**  **$50,937,012 $96,268,199** Notes for this table are Minnkota's unless otherwise noted. See December 2009 submittal for full set of notes.

1 2 3 $35/MW -hr in 2006 $. 5 $7,500/m3 n 2006 $. 6 Replace 1 layer every 2 years. Uses 2.51 and 2.52 in OAQPS Cost Manual 7 Replace 3 layers/y r for U1 and 4 layers/y r for U2. Did not use annualize adjustments in OAQPS manual. ERG-1 8 $7.98/MMBTU 12 Capital recovery

factor is 0.087185 Minnkota's 2/11/10 response noted an error in the NG costs for U1 LDSCR. ERG input correct cost values for U1SCR based on 2/11/10 submittal. Assumed 3% of installed capital cost of SCR equipment and auxillary equipm ent. Not including catalyst replacement cost. Urea $379.29/ton in 2006 dollars.**TA BLE C. Supporting Information for Minnkota A** **nnual Costs**

Notes Item Low Dust U1 Low Dust U2 Tail End U1

1 **An nual Maintenance**  2.85% 3.26% 3.11% 2 **Volume of urea (tons)**

Scenario A 7146 10998 7143 Scenario B 7191 11094 7189 **Electrical Cost Checks**

3 Additional Power Dem and of System

(MW ) 8.0 12.4 9.7
Reduction in Operating Hours (hr/y r) 4 Scenario A 256 247 213

Scenario B 981 1235 938
Unit baseline availabiltiy 97.3% 93.9% 93.7% Updated availabilty Scenario A 92.3% 89.0% 92.8% Scenario B 84.0% 77.8% 84.5% Calculated new availabilty Scenario A 94.4% 91.1% 91.3% Scenario B 86.1% 79.8% 83.0%
Baseline capacity 96.6% 95.2% 96.6% Updated capacity Scenario A 94.2% 92.9% 93.7% Scenario B 94.2% 92.9% 93.7%

Reduction in Operating Hours (hr/y r) Scenario A 444 428 401 Scenario B 1,169 1,416 1,126 Calculate electricity

costs MW /y r required for power demand Scenario A 60932 89811 73886 Scenario B 55453 78509 67278 MW for downtime Scenario A 108514 188320 98004 Scenario B 285704 623040 275194 Costs Scenario A $5,930,602 $9,734,599 $6,016,171 Scenario B $11,940,478 $24,554,225 $11,986,5295 **Volume of catalyst replaced**

6 Scenario A 1,893 2,555 1,893 7 Scenario B 11,700 27,360 11,700

Volum e of catalyst layers First three layers 146 256 146 Fourth layer 195 342 195 Total 633 1110 633 Calculated number of times full cat vol replaced Scenario A 3.0 2.3 3.0 Scenario B 18 25 18 Reported number layers replaced Scenario A 12 12 10 Scenario B 60 80 60

ERG-1,8 Volum e of Natural Gas Purchased (MMBTU) Scenario A 446104 759913 492671 9 Scenario B 406125 663722 448728

10

11

12 Percent of Total Capital 0.0830 0.0859 0.0821

13

14

15 Levelized costsNotes for this table are Minnkota's unless otherwise noted. See December 2009 submittal for full set of notes.

Replace 3 layers/y r for U1 and 4 layers/y r for U2. Did not use annualize adjustments in OAQPS manual. Minnkota's 2/11/10 response noted an error in the NG costs for U1 LDSCR. ERG input correct cost Assumed 3% of installed capital cost of SCR equipment and auxillary equipm ent. Not including catalystTail End U2

3.21% % of Total Capital

10995 tons urea @ $379/ton 11094

14.9

206 1235

93.9% 89.5% 77.8%

91.5% 79.8%

95.2% U1 = 244.4/253 U2 = 440/462

92.4% 92.4%

387 1,416

107941 93830 170280 623040
$9,737,726 $25,090,452 =new operating hours/8760

[(baseline availability

x 8760 - reduction)/8760]

U1 = 244.4; U2=4402,569 m3 catalyst @ $7,500/m3

27,360 m3 catalyst @ $7,500/m3

256 342 1110

2.3 25

10 80

804026 698566

0.0848 Calculated as annual costs/capital cost

Total Direct * 1.24873 + Indirect**Table D. Comparison with OA QPS Cost Manual Procedures** 

Notes Item Minnkota's documentation stated they used 3%. **An nual Maintenance** 

Calculated based on Minnkota's cost.

Reported in Minnkota's November 2009 submittals for Units 1 and 2 (p4-22 in both submittals). **An nual Electricity Costs**  **Catalyst Replacement Costs** 

Reported in Minnkota's November 2009 submittals (Tables C.4-1 and C.4-2).

Reported in Minnkota's November 2009 submittals (Tables C.4-1 and C.4-2).
Reported in Minnkota's November 2009 submittals (Tables C.4-1 and C.4-2).

This calculation checks Minnkota's input with the final electrical costs. Reported in Minnkota's November 2009 submittals (text portion). Minnkota assumes 2 shifts/day

.

Reported in Minnkota's November 2009 submittals (Tables C.4-1 and C.4-2). **NOTE: ERG's calculated new availability based on the reduction in operating hours does not match Minnkota's**  **values due to Minnkota including A SOFA** 
**.**

Reported in Minnkota's November 2009 submittals (Tables C.4-1 and C.4-2). Minnkota is including outage for ASOFA alternative.Reported in Minnkota November 2009 submittal.

Minnkota reported 0.087185. **Indirect A nnual Costs** 

**Levelized Costs** Number of layers replaced by scenario and ty pe reported in Minnkota's November and December 2009 response. Calculated based on reported volume per layer. Note that these num bers x 4 layers should equal the number of layer replaced below. Num bers are slightly off indicating Minnkota may have Calculated based on Minnkota's catalyst costs and assumed 20 ye ar life. (annual cost * 20/$7500/m3)**Table D. Comparison with OA QPS Cost Manual Procedures** 

OAQPS Guidance Notes 1.5% of total capital costs Compares to 3% used by Minnkota

Estimated for SCR equipment, ammonia vaporization, and additional ID fan power. Based on pressure differentials. Minnkota provided the additional power dem and required by

SCR in MW

. Assumes a catalyst replacement interval of 3 years. Catay lst cost is multiplied by a future worth factor (FW F) to factor in purchases every few years.Capital recovery factor (CRF) x total capital investment. CRF is based on interest rate. At 6% interest and a 20 year life, the CRF is 0.087185.

Not included in OAQPS manual.**Revised Costs - New Catalyst Volumes, Costs, and Replacement Time (OA QPS assumptions and new capital costs)**  Item DIRECT ANNUAL COSTS Low Dust U1 Low Dust U2 Tail End U1 Tail End U2 Notes (1) **An nual Maintenance Costs**  $1,395,348 $2,495,195 $1,846,933 $3,252,998 Use OAQPS rate of 1.5%

(2) **An nual Reagent Costs**  $2,838,965 $4,186,476 $2,715,994 $4,185,787 Used avg tons urea of Scenario A and B since volumes are similar and $379/ton cost. Reagent costs 2006$ $379 $379 $379 $379 Cost factor (2006 = CF *2009) 0.957 0.957 0.957 0.957 See summary sheet rows 52/53 Reagent costs 20096$ $396 $396 $396 $396 (3) **An nual Electricity Costs**  See computations in Table C1.

Scenario 1 $3,110,338 $5,535,991 $3,567,949 $6,171,540 Scenario 2 $2,679,246 $4,426,227 $3,139,683 $5,067,598 Scenario 3 $2,248,153 $3,316,463 $2,711,417 $3,963,656 Scenario 4 $3,806,718 $4,791,760 $4,259,764 $5,424,712(4) Annual W ater Costs

**Catalyst Replacement Costs** (5) Scenario 1 $1,215,000 $2,055,000 $750,000 $1,275,000 $6000/m3

Scenario 2 $607,500 $1,027,500 $375,000 $637,500 Scenario 3 $405,000 $685,000 $250,000 $425,000 Scenario 4 $1,215,000 $2,055,000 $750,000 $1,275,000

(6) **Natural Gas for F.G.**

**Reheating & Urea-to Am**  **monia Conversion sys** $3,400,396 $5,680,304 $3,756,182 $5,995,343 Used avg tons urea of Scenario A and B since volumes are similar and $7.98/MMBTU cost.

(7) Operating labor for SCR

equipm ent and urea-toam mo nia equipm ent **DIRECT A NNUA**  **L COSTS - TOTA**  **L** Scenario 1 **$11,960,047 $19,952,966**  **$12,637,059 $20,880,668**  Scenario 2 **$10,921,454 $17,815,701**  **$11,833,792 $19,139,226**  Scenario 3 **$10,287,862 $16,363,437**  **$11,280,526 $17,822,784** Scenario 4 **$12,656,427 $19,208,735**  **$13,328,873 $20,133,841** 

INDIRECT ANNUAL COSTS
(8) Annual costs from capital

recovery $8,110,185 $14,502,832 $10,734,938 $18,907,411 Use OAQPS value of CFR x OAQPS capital investment and 6% interest rate.
(9) Adm inistrative overhead,

insurance and property taxes for SCRs and aux. **INDIRECT A NNUA**  **L COSTS - TOTA**  **L $8,110,185**  **$14,502,832 $10,734,938**  **$18,907,411 TOTA**  **L A NNUA**  **L COSTS** Scenario 1 **$20,070,231 $34,455,798**  **$23,371,997 $39,788,079**  Scenario 2 **$19,031,639 $32,318,533**  **$22,568,730 $38,046,637**  Scenario 3 **$18,398,047 $30,866,269**  **$22,015,464 $36,730,195**  Scenario 4 **$20,766,612 $33,711,566**  **$24,063,811 $39,041,252**  **LEVELIZED TOTA L**  **AN NUA**  **LIZED COSTS** OAQPS does not included levelized cost factor. Scenario 1 Scenario 2 Scenario 3 Scenario 4**TA BLE E. Supporing Information for Revised A** **nnual Cost Calculations** Item Low Dust U1 Low Dust U2 Tail End U1 Tail End U2

**Volume of urea (tons)** Scenario A 7146 10998 7143 10995 tons urea @ $379/ton Scenario B 7191 11094 7189 11094 **Electrical Cost Checks** Additional Power Dem and of System (MW ) 8.0 12.4 9.7 14.9 Reduction in Operating Hours Due to Cat Change (hr/y r) Scenario 1 104 148 104 148 Replace 1 layer/year Scenario 2 52 74 52 74 Replace 1 layer/2 years Scenario 3 0 0 0 0 Replace 1 layer/3 years Scenario 4 188 181 188 181 ASOFA assumptions Time required to replace layer (hrs) Reactor cooldown 48 48 48 48 Remove spent catalyst 64 64 64 64 Install fresh catalyst 52 96 52 96 Post changeout time 36 36 36 36 Subtract normal 4 day

outage period 96 96 96 96 **Total Time 104**  **148 104**  **148**
Unit baseline availabiltiy 97.3% 93.9% 97.3% 93.9% Updated availabilty Calculated new availabilty Scenario 1 96.1% 92.2% 96.1% 92.2% Scenario 2 96.7% 93.1% 96.7% 93.1% Scenario 3 97.3% 93.9% 97.3% 93.9% Scenario 4 95.2% 91.8% 95.2% 91.8% Baseline capacity 96.6% 95.2% 96.6% 95.2% U1 = 244.4/253 U2 = 440/462 Updated capacity 94.2% 92.9% 93.7% 92.4% Used same as Minnkota submittal =new operating hours/8760 [(baseline availability x 8760 -reduction)/8760]Calculate electricity costs MW hr/y r required for power demand Scenario 1 63449 93051 76524 111210 Scenario 2 63841 93904 76996 112229 Scenario 3 64233 94756 77469 113247 Scenario 4 62816 92671 75760 110755 MW hr/y r for downtime Scenario 1 25418 65120 25418 65120 Scenario 2 12709 32560 12709 32560 Scenario 3 0 0 0 0 Scenario 4 45947 44236 45947 44236 Electrical costs - reduced generation Scenario 1 $2,220,722 $3,256,791 $2,678,333 $3,892,340 Scenario 2 $2,234,438 $3,286,627 $2,694,875 $3,927,998 Scenario 3 $2,248,153 $3,316,463 $2,711,417 $3,963,656 Scenario 4 $2,198,566 $3,243,486 $2,651,612 $3,876,438 Electrical costs - dowtime Scenario 1 $889,616 $2,279,200 $889,616 $2,279,200 Scenario 2 $444,808 $1,139,600 $444,808 $1,139,600 Scenario 3 $0 $0 $0 $0 Scenario 4 $1,608,152 $1,548,274 $1,608,152 $1,548,274 **Volume of catalyst replaced** Scenario 1 203 343 125 213 Scenario 2 101 171 63 106

Scenario 3 68 114 42 71 Scenario 4 203 343 125 213 Volum e of catalyst layers Each layer 202.5 342.5 125 212.5

Volum e of Natural Gas Purchased (MMBTU) Scenario A 446104 759913 492671 804026 Scenario B 406125 663722 448728 698566 Add power dem and x availability x capacity

x 8760
U1 = 244.4; U2=440 hours downtime x MWNotes Minnkota's documentation stated they used 3%.

Calculated based on Minnkota's cost.

Use same assumptions as Minnkota for extra power demand of systems. (Reported in Minnkota's November 2009 submittals for Units 1 and 2 (p4-22 in both submittals).)

Reported in Minnkota's November 2009 submittals (Tables C.4-1 and C.4-2).

Reported in Minnkota's November 2009 submittals (Tables C.4-1 and C.4-2). Annualize hours per year based on change out frequency . Did not include ASOFA. Assume catalyst replacement performed during major outage for every 3 year scenario. Therefore, no additional downtime is due to the catalyst outage. Revised assumptions for catalyst changeout per EPA's analysis.EPA vendor info. W ill have total of three layers. For catalyst replacement every two or three years, ERG divided the catalysts costs equally

over the time period. This calculation checks Minnkota's input with the final electrical costs.

Annualized hours per year based on replacement frequency . Scenario 1: 1 layer/y r; Scenario 2: 1 layer/2 y rs; Scenario 3: 1 layer/3 y rs;