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 2006NOx 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

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

0.1830 0.26 0.002222222 PM10 AVERAGES NOx SO2Unit 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 3LImit 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 Fu el Switching - NG 34.8 118 0.12 0.137 27 31 ROF A 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 Fu el Switching - NG 62.8 $1,428,911 $22,763 $1,534 ROF A 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 injection ratios from PCC Industries and cost of Trona ($125/ton) 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 costs 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 CostsBuilding enclosures/foundations 2.5x Basic Equipment less basic equipment

2.5x Basic Equipment less basic equipment

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

60% of oper, maint & supv labor + maint. mtl costsFGR 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 3Regenerative 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**