Unit

NOx SO2 PM10

tons/year tons/year tons/year

B003 205 263.7 2.33

Year Coal usage (tons/year) Coal heating value (Btu/lb) Coal usage (MMBtu/yr)

2000 38,438 12,959 996,236

2001 36,993 12,344 913,283

2002 35,187 12,449 876,086

2003 35,449 12,378 877,575

2004 33,375 12,404 827,967

2005 32,840 12,189 800,574

2006 35,245 12,407 874,569

2007 28,485 12,483 711,157

2008 31,601 12,742 805,320

AVG 34,179 12,484 853,641

MAX 38,438 12,959 996,236

Uncontrolled PM10 Emissions

Emission factor 13.2 lb PM10/ton coal

Emission factor 0.529 lb PM10/MMBtu coal

Uncontrolled Emissions 263.346 tons PM10/year

Uncontrolled NOx Emissions

Emission factor 11.000 lb NOx/ton coal

Emission factor 0.441 lb NOx/MMBtu coal

Control Efficiency (Average of 2006 - 2008)

Boiler 3 100.0%

Stack Test Control Efficiency

Boiler 3 93.0% Date: August 23, 2007 Emissions

SO2 Calcs Using Stoker Coal Analysis

Max %S Min btu/lb

2000-2006 0.55 11,068

2006-2008 0.55 11,221

2009-Nov 2010 0.57 11,444

SO2 lb/mmbtu = (%S/100) * (64.032/32.064 MWSO2/MWS) / (btu/lb) * (10^6 btu/MMBtu)

B003

Historical Baseline

2006
NOx SO2 PM10 NOx SO2 PM10

tons/year tons/year tons/year tons/year tons/year tons/year tons/year

150.44 205.00 1.88 170.36 266.80 2.086

NOx (tpy) w/ 20% contingency SO2 (tpy) PM10 (tpy) SO2 w/ 20% contingency

 205 246 276 2.46 331

 193 232 253.7 2.32

 185 222 247.6 2.22

 186 223 263.5 2.23

 175 210 269.7 2.10

 174 208 263.1 2.08

 185 222 264 2.33

 150 181 205 1.88

 170 204 267 2.09

 180 216 257 2.19

 205 246 276 2

Boiler 3

Boiler 3

Table 1.1-3 B-rated in AP-42

unit conversion method

0.037 lb PM10/MMBtu coal

SO2 lb/MMBtu plus 20% rounded

0.99 1.19 1.2

0.98 1.17 1.2

0.99 1.19 1.2

2008

NOx

2007
lb/MMBtu tons/year lb/MMBtu tons/year lb/MMBtu

0.1830 0.26 0.002222222

PM10

AVERAGES

NOx SO2
Unit Fuel Heating Value % Sulfur % Ash Tons Fuel Heating Value % Sulfur

B003 12407 0.41 8.78 35245 12483 0.39

2006 2007
% Ash Tons Fuel Heating Value % Sulfur % Ash Tons Fuel Heating Value

9.12 28485 12742 0.45 7.27 31601 12541

2008 Weighted Average
% Sulfur % Ash

0.42 8.38

Weighted Average
Annual 

Emissions 

(tons/year)

Baseline --- 257

DSI - Trona 60 103

Fuel Switching - Natural Gas 100 0

Alternative Emissions Reduction (tpy) Annualized Cost 

($)

Baseline 0 $0 

DSI - Trona 153.9 $1,340,661

Fuel Switching - Natural Gas 256.6 $1,428,911

CENC COST ANALYSIS

Alternative Control Efficiency (%)

Boiler 3
LImit 1.8 lb/MMBtu

MCR 225 MMBtu/hour

Annual 

Average 

(lb/MMBtu)

30-day Rolling 

Average 

(lb/MMBtu)

Annual 

Emission 

Limit 

(lb/hour) 

(Reg 1)

30-day rolling 

average 

(lb/hour) (Reg 

1)

0.260 0.273 405 405

0.104 0.109 23.4 24.6

0.000 0.000 0.0 0.0

Cost 

Effectiveness 

($/ton)

Incremental 

Cost ($/ton)

$0 ---

$8,709 $57

$5,569 -$31

Resultant Emissions

MCR 225 MMBtu/hour

Annual 

Emissions 

(tons/year)

Annual 

Average 

(lb/MMBtu)

30-day Rolling 

Average 

(lb/MMBtu)

Annual 

Average 

(lb/hour)

30-day Rolling 

Average 

(lb/hour)

Max Year + 20% Contingency --- 246 0.25 0.29 56 65

Baseline (2000 - 2008) --- 180 0.18 0.21 41 47

Flue Gas Recirculation 20 144 0.15 0.168 33 38

SNCR 30 126 0.13 0.147 29 33

Fuel Switching - NG 34.8 118 0.12 0.137 27 31

ROFA w/ Rotamix 57.1 77 0.08 0.090 18 20

Regenerative SCR 74.5 46 0.047 0.054 11 12

High Temperature SCR 85.7 26 0.026 0.030 6 7

Low Temperature SCR 85.7 26 0.026 0.030 6 7

Alternative Emissions Reduction (tpy) Annualized Cost 

($)

Cost 

Effectiveness 

($/ton)

Incremental Cost 

($/ton)

Baseline 0 $0 $0 ---

Flue Gas Recirculation 36.1 $278,358 $7,716 $214

SNCR 54.1 $513,197 $9,484 $98

Fuel Switching - NG 62.8 $1,428,911 $22,763 $1,534

ROFA w/ Rotamix 103.0 $978,065 $9,496 -$330

Regenerative SCR 134.4 $1,965,929 $14,629 $164

High Temperature SCR 154.6 $2,772,286 $17,933 $164

Low Temperature SCR 154.6 $3,222,223 $20,844 ---

CENC COST ANALYSIS

Boiler 3

Alternative Control Efficiency (%) Resultant Emissions
CEN COSTS

Trona - DSI 

Direct Equipment Cost (Trona) $ 834,000 Systems

Direct Equipment Cost (Trona) $ 165,000 Building enclosures/foundations

Direct Installation Cost $ 1,498,500 2.5x Basic Equipment less basic equipment

Direct Equipment Cost (Ash System) $ 1,150,000

Lost Revenue (Ash Upgrade) $ -

Direct Equipment (Power Supply Design) $ -

Direct Equipment (Control System Design) $ 65,000

Ash/Electrical Installation Cost $ 97,500 2.5x Basic Equipment less basic equipment

Indirect Costs

Engineering $ 202,600

Construction Management $ 405,200

Startup and Testing $ 202,600

Owner Management $ 50,000

Contingency $ 567,280 20%

TOTAL CAPITAL COSTS $ 5,237,680

Trona - DSI 

Annual Trona Costs $ 60,060 Calculated based on SO2 controlled and inject

Annual Disposal Costs $ 11,842

Annual Electrical Costs $ 34,113

Operating Labor $ 65,700 2 hr/shift @ $30/hr

Supervisor $ 9,855 15% of operating labor

Maintenance Labor $ 81,754 2% of total installed cost

Maintenance Materials $ 81,754 2% of total installed cost

Overhead $ 143,437 60% of oper, maint & supv labor + maint. mtl 

Property Tax $ 40,877 1% of total installed cost

Insurance $ 81,754 2% of total installed cost

Administration $ 81,754 2% of total installed cost

Capital Recovery $ 385,877 7%, 20 years

Original O&M Costs $ 1,078,777

Original Annualized Costs $ 1,340,661

COMPARISON (Annualized to total) 26%

Capital Costs

O&M Costs
res/foundations

ment less basic equipment

ment less basic equipment

 on SO2 controlled and injection ratios from PCC Industries and cost of Trona ($125/ton)

nt & supv labor + maint. mtl costs
FGR SNCR ROFA w/ Rotamix

Total Installed Capital Costs $ 900,000 $462,857 $3,045,312

Other Owner Costs $ 1,575,000 $810,000 $5,329,296

TOTAL CAPITAL COST $ 2,475,000 $ 1,272,857 $ 8,374,608

Totoal Fixed O& M Costs $ 15,750 $ 8,100 $ 53,293

Reagent Cost $ - $ 190,626 $ 49,018

SCR Catalyst $ - $ - $ -

Electric Power Cost $ 14,493 $ 1,848 $ 18,116

Total Variable Cost $ 14,493 $ 192,474 $ 67,134

Total O&M and VARIABLE COST $ 44,736 $ 393,048 $ 187,561

Capital Recovery $ 233,622 $ 120,149 $ 790,504

TOTAL ANNUALIZED COST $ 278,358 $ 513,197 $ 978,065

Annual/Total Capital Cost 11.2%

O&M/Annualized 76.6%

O&M Costs

CENC COSTS - Unit 3
Regenerative SCR Fuel Switching - NG HT SCR LT SCR NOTES

$3,275,760 $5,157,025 $1,607,143 $3,992,658

$5,732,580 $9,024,793 $2,812,500 $3,992,658

$ 9,008,340 $ 14,181,818 $ 4,419,643 $ 7,985,316

$ 97,797 $ 90,248 $ 28,125 $ 39,927

$ 14,111 $ - $ 33,941 $ 8,686

$ 439,209 $ - $ 1,073,964 $ 1,150,000

$ 55,584 $ - $ 55,584 $ 55,584

$ 508,904 $ - $ 1,163,489 $ 1,214,269

$ 1,115,605 $ 90,248 $ 2,355,103 $ 2,468,466

$ 850,324 $ 1,338,663 $ 417,183 $ 753,757 7%, 20 years

$ 1,965,929 $ 1,428,911 $ 2,772,286 $ 3,222,223

21.8% 62.7% 40.4%
Direct Capital Cost $ - (CEN asserts that Boiler 4 has the capacity to run natural gas with NOx limit of 0.2 lb/MMBtu)

Indirect Installation Costs

General Facilities $ - 5% of direct capital cost

Engineering (and Home Office) Fees $ - 10% of direct capital cost

Process Contingency $ - 5% of direct capital cost

Total Indirect Installation Costs $ -

Project Contingency ($) $ - 15% od direct installation costs and direct capital cost

Total Plant Cost $ -

Allowed for Funds During Construction $ -

Royalty Allowance $ -

Preproduction Cost $ - 2% of direct installation costs and direct capital cost

Inventory Capital $ -

Total Capital Investment $ -

Annual Maintenance Costs $ - 1.5% of total capital investment

Annual Electricity Costs $ 8,249,862.24 (difference between coal and natural gas - see coal vs. ng page)

Direct Annual Costs $ 8,249,862.24

Cost Recovery $ - No capital costs included in this cost analysis

Annual O&M Cost $ 8,249,862.24

NOx natural gas emissions Natural gas fuel heating value 0.12 lb/MMBtu

62.8 tons/year

Average NOx emissions 216.5 tons/year (2006-2008 APEN data)

Annual NOx control from natural gas switching 153.7 tons/year

71.00% control

Annualized Cost to Control $ 8,249,862

Cost Effectiveness ($/ton) $ 53,680

SO2 natural gas emissions Natural gas fuel heating value 0.000584226 lb/MMBtu (AP-42 Table 1.4-2)

0.0 tons/year

Average SO2 emissions (average of CAMD 2006-2008) 266.8 tons/year (2006-2008 CEMs data)

 0.260 lb/MMBtu

Annual SO2control from natural gas switching 266.8 tons/year

100% control

Annualized Cost to Control $ 8,249,862

Cost Effectiveness ($/ton) $ 30,922

APCD Technical Analysis - CENC Boiler 3 - Natural Gas Switching
Unit 3

Coal Heating Value 12,541 Btu/lb (from CEN average of 2006 - 2008 APENs)

Natural Gas Heating Value 24,276 Btu/lb (from AP-42 Table 1.4-2 and standard scf/lb for natural gas)

 1,020 MMBtu/MMscf (AP-42)

Cost of coal (2008) $ 20.00 $/ton (standard CO facility cost - 2008)

Cost of natural gas (2008) $ 9.26 $/Mscf Assumed electric power price Source: http://tonto.eia.doe.gov/dnav/ng/ng_pri_sum_dcu_nus_a.htm

CEN Boiler 3 Annual Fuel Use 996,236 MMBtu/yr (based on average of 2006, 2007, and 2008 APEN data)

Anticipated CENC Boiler 3 N.G. fired fuel use 996,236 MMBtu/yr

Calculated Coal Consumption (tons) 39,720 tons

Calculated Coal Consumption (MMscf) 977 MMscf

Calcualted Coal Consumption (Mscf) 976,702 Mscf

Annual Cost of Coal $ 794,399

Annual Cost of Natural Gas $ 9,044,261

Cost Differential $ 8,249,862

2008 Coal vs. Natural Cost Differential Calculations