### STATE FACILITY_NAME ORISPL_CODE UNITID OP_YEAR ASSOC_STACKS PRG_CODE_INFO

SUM_OP_TIME NUM_MONTHS_REPORTED AZ Navajo Generating Station 4941 1 2001 ARP 7904.48 12 AZ Navajo Generating Station 4941 1 2002 ARP 8516.85 12 AZ Navajo Generating Station 4941 1 2003 ARP 7598.23 12 AZ Navajo Generating Station 4941 2 2001 ARP 8642.05 12 AZ Navajo Generating Station 4941 2 2002 ARP 8189.05 12 AZ Navajo Generating Station 4941 2 2003 ARP 8430.2 12 AZ Navajo Generating Station 4941 3 2001 ARP 7840.86 12 AZ Navajo Generating Station 4941 3 2002 ARP 8542.56 12 AZ Navajo Generating Station 4941 3 2003 ARP 7151.81 12

2001 to 2003 Unit 1 0.36 7616

Unit 2 0.36 8120 Unit 3 0.34 7913 tons/day **Unit 1 32.8** 

**Unit 2 34.9**  **Unit 3 32.2** 

Unit 1 0.24 7616 Unit 2 0.24 8210 Unit 3 0.24 7913 tons/day if LNB were baseline

**Unit 1 21.9**  90% capacity factor **Unit 2 23.6**  **Unit 3 22.8** 

### SO2_MASS NOX_RATE NOX_MASS CO2_MASS HEAT_INPUT NOx lb/mmbtu avg heat input

1062.752 0.3699 10841.19 5878709 57297411.5 0.378418072 7248.726 1272.894 0.3543 11630.77 6684087 65147474.9 0.35705958 7649.245 1098.857 0.3358 10272.41 6197593 60405414.4 0.340115637 7949.932 1183.303 0.3568 12356.19 7043405 68649157.5 0.359980849 7943.62 1151.675 0.347 11677.84 6828040 66550066.1 0.350948892 8126.714 1232.274 0.3579 12686.04 7170757 69890458.7 0.363026262 8290.486 1733.476 0.3258 10822.04 6740012 65692125.8 0.329477662 8378.179 1582.628 0.3577 12260.06 6946138 67701146.3 0.362181873 7925.159 1049.112 0.3205 8661.887 5456420 53182543.7 0.325741734 7436.236

## Navajo Generating Station Unit 1 Unit 2 Unit 3 Facility Wide

Avg operating hours (01-03) 7616 8120 7913 7883 Avg Heat Input (2001-2003) 8007 8420 7845 8091 Baseline (2001-03) 0.36 0.36 0.34 0.35 Limit with LNB+SOFA 0.24 0.24 0.24 0.24 Avg emissions 01-03 10,976 12,308 10,554 33,837 Avg emissions LNB+SOFA 7,317 8,205 7,450 Emissions at 0.08 lb/MMBtu 2,439 2,735 2,483 7,657 Emissions at 0.05 lb/MMBtu 1,524 1,709 1,552 4,786

80% reduction on baseline 0.072 0.072 0.068 80% reduction on LNB 0.048 0.048 0.048
% reduction if limit is 0.08 from baseline 78% 78% 76% % reduction if limit is 0.05 from baseline 86% 86% 85%
% reduction if limit is 0.08 from LNB+SOFA 67% 67% 67% % reduction if limit is 0.05 from LNB+SOFA 79% 79% 79%

Hg 270 lb/yr facility wide 1.410413583

### ton/day Notes Unit 1 Unit 2 Unit 3 hr/yr MMBtu/hr lb/MMBtu 32.90 35.08 32.29 30-day rolling avg - PSD limit 23.06 24.25 22.59 0.299146 0.30869 0.300194

lb/MMBtu lb/MMBtu

### Table 5 from TSD for proposed BART determination for NGS **Option (#)** 

### Cost or Cost Effectiveness[1] **Unit 1 Unit 2**  **Unit 3** Baseline Rate 0.49 0.45 0.46 

### Avg Heat Input (2001-2003) 7616 8120 7913 Avg operating hours (01-03) 8007 8420 7845
LNB + SOFA + SCR (Units 1 – 3) Total Capital Investment ($) $212,000,000 $281,000,000 $212,000,000 (Option 4) Total Annual Cost ($/yr) $28,951,500 $36,945,000 $28,951,500 Expected Emission (lb/MMBtu) 0.08 0.08 0.08 % NOxReduction from Baseline 84% 82% 83% TPY NOxReduced 12,500 12,650 11,795 Cost Effectiveness $2,316 $2,921 $2,455 LNB + SOFA on Unit 2, LNB + SOFA + SCR on Units 1 and 3 Total Capital Investment ($) $212,000,000 $14,000,000 $212,000,000 (Option 3) Total Annual Cost ($/yr) $28,951,500 $1,622,000 $28,951,500 Expected Emission (lb/MMBtu) 0.08 0.24 0.08 % NOxReduction from Baseline 84% 47% 83% TPY NOxReduced 12,500 7,180 11,795 Cost Effectiveness ($/ton) $2,316 $226 $2,455 LNB + SOFA + SNCR on Units 1 – 3 Total Capital Investment ($) $26,000,000 $26,000,000 $26,000,000 (Option 2) Total Annual Cost ($/yr) $8,809,333 $8,809,333 $8,809,333 Expected Emission (lb/MMBtu) 0.2 0.2 0.2 % NOxReduction from Baseline 59% 56% 57% TPY NOxReduced 8,842 8,547 8,070 Cost Effectiveness ($/ton) $996 $1,031 $1,092 LNB + SOFA on Units 1 – 3 Total Capital Investment ($) $14,000,000 $14,000,000 $14,000,000 (Option 1a) Total Annual Cost ($/yr) $1,622,000 $1,622,000 $1,622,000 Expected Emission (lb/MMBtu) 0.2 0.2 0.2 % NOxReduction from Baseline 59% 56% 57% TPY NOxReduced 8,842 8,547 8,070 Cost Effectiveness ($/ton) $183 $190 $201 LNB + SOFA on Units 1 – 3 Total Capital Investment ($) $14,000,000 $14,000,000 $14,000,000 (Option 1) Total Annual Cost ($/yr) $1,622,000 $1,622,000 $1,622,000 Expected Emission (lb/MMBtu) 0.24 0.24 0.24 % NOxReduction from Baseline 51% 47% 48% TPY NOxReduced 7,622 7,180 6,829 Cost Effectiveness ($/ton) $213 $226 $238[1] TPY NOx reduced (SRP) and Cost Effectiveness in $/ton (SRP) were calculated using baseline emission rates of 0.49, 0.45, and 0.46 lb/MMBtu for Units 1 – 3, respectively. TPY NOx reduced (EPA) and Cost Effectiveness in $/ton (EPA) were calculated using baseline emission rates of 0.35, 0.37, and 0.31 lb/MMBtu for Units 1 – 3, respectively with post-SCR control NOx emissions of 0.06 lb/MMBtu.[1] TPY NOx reduced (SRP) and Cost Effectiveness in $/ton (SRP) were calculated using baseline emission rates of 0.49, 0.45, and 0.46 lb/MMBtu for Units 1 – 3, respectively. TPY NOx reduced (EPA) and Cost Effectiveness in $/ton (EPA) were calculated using baseline emission rates of 0.35, 0.37, and 0.31 lb/MMBtu for Units 1 – 3, respectively with post-SCR control NOx emissions of 0.06 lb/MMBtu.[1] TPY NOx reduced (SRP) and Cost Effectiveness in $/ton (SRP) were calculated using baseline emission rates of 0.49, 0.45, and 0.46 lb/MMBtu for Units 1 – 3, respectively. TPY NOx reduced (EPA) and Cost Effectiveness in $/ton (EPA) were calculated using baseline emission rates of 0.35, 0.37, and 0.31 lb/MMBtu for Units 1 – 3, respectively with post-SCR control NOx emissions of 0.06 lb/MMBtu.[1] TPY NOx reduced (SRP) and Cost Effectiveness in $/ton (SRP) were calculated using baseline emission rates of 0.49, 0.45, and 0.46 lb/MMBtu for Units 1 – 3, respectively. TPY NOx reduced (EPA) and Cost Effectiveness in $/ton (EPA) were calculated using baseline emission rates of 0.35, 0.37, and 0.31 lb/MMBtu for Units 1 – 3, respectively with post-SCR control NOx emissions of 0.06 lb/MMBtu.

### Adapted Table 5 from TSD for proposed BART determination for NGS using average baseline emission rates, heat inputs, and operating hours from 2004-06 **Option (#)** 

### Cost or Cost Effectiveness[1] **Unit 1 Unit 2**  **Unit 3** Baseline Rate (2004 - 2006) 0.35 0.37 0.31 

### Avg Heat Input (2004-2006) 8184 8050 7814 Avg operating hours (04-06) 8126 7841 8352 Baseline emissions 11,638 11,677 10,116 LNB + SOFA + SCR (Units 1 – 3) Total Capital Investment ($) $212,000,000 $281,000,000 $212,000,000 (Option 4) Total Annual Cost ($/yr) $28,951,500 $36,945,000 $28,951,500 Expected Emission (lb/MMBtu) 0.08 0.08 0.08 % NOxReduction from Baseline 77% 78% 74% TPY NOxReduced 8,978 9,152 7,505 Cost Effectiveness $3,225 $4,037 $3,858 LNB + SOFA on Unit 2, LNB + SOFA + SCR on Units 1 and 3 Total Capital Investment ($) $212,000,000 $14,000,000 $212,000,000 (Option 3) Total Annual Cost ($/yr) $28,951,500 $1,622,000 $28,951,500 Expected Emission (lb/MMBtu) 0.08 0.24 0.08 % NOxReduction from Baseline 77% 35% 74% TPY NOxReduced 8,978 4,103 7,505 Cost Effectiveness ($/ton) $3,225 $395 $3,858 LNB + SOFA + SNCR on Units 1 – 3 Total Capital Investment ($) $26,000,000 $26,000,000 $26,000,000 (Option 2) Total Annual Cost ($/yr) $8,809,333 $8,809,333 $8,809,333 Expected Emission (lb/MMBtu) 0.2 0.2 0.2 % NOxReduction from Baseline 43% 46% 35% TPY NOxReduced 4,988 5,365 3,589 Cost Effectiveness ($/ton) $1,766 $1,642 $2,454 LNB + SOFA on Units 1 – 3 Total Capital Investment ($) $14,000,000 $14,000,000 $14,000,000 (Option 1a) Total Annual Cost ($/yr) $1,622,000 $1,622,000 $1,622,000 Expected Emission (lb/MMBtu) 0.2 0.2 0.2 % NOxReduction from Baseline 43% 46% 35% TPY NOxReduced 4,988 5,365 3,589 Cost Effectiveness ($/ton) $325 $302 $452 LNB + SOFA on Units 1 – 3 Total Capital Investment ($) $14,000,000 $14,000,000 $14,000,000 (Option 1) Total Annual Cost ($/yr) $1,622,000 $1,622,000 $1,622,000 Expected Emission (lb/MMBtu) 0.24 0.24 0.24 % NOxReduction from Baseline 31% 35% 23% TPY NOxReduced 3,658 4,103 2,284 Cost Effectiveness ($/ton) $443 $395 $710[1] TPY NOx reduced (SRP) and Cost Effectiveness in $/ton (SRP) were calculated using baseline emission rates of 0.49, 0.45, and 0.46 lb/MMBtu for Units 1 – 3, respectively. TPY NOx reduced (EPA) and Cost Effectiveness in $/ton (EPA) were calculated using baseline emission rates of 0.35, 0.37, and 0.31 lb/MMBtu for Units 1 – 3, respectively with post-SCR control NOx emissions of 0.06 lb/MMBtu.

### Adapted Table 5 from TSD for proposed BART determination for NGS using average baseline emission rates, heat inputs, and operating hours from 2004-06

Incremental Costs Unit 1 Unit 2 Unit 3 LNB - SNCR (2009 SRP costs) $5,404 $5,693 $5,506 SNCR-SCR (2009 SRP costs) $5,048 $7,429 $5,144 LNB - SCR (2009 SRP costs) $5,137 $6,995 $5,235 baseline - LNB (2009 SRP costs) $443 $395 $710[1] TPY NOx reduced (SRP) and Cost Effectiveness in $/ton (SRP) were calculated using baseline emission rates of 0.49, 0.45, and 0.46 lb/MMBtu for Units 1 – 3, respectively. TPY NOx reduced (EPA) and Cost Effectiveness in $/ton (EPA) were calculated using baseline emission rates of 0.35, 0.37, and 0.31 lb/MMBtu for Units 1 – 3, respectively with post-SCR control NOx emissions of 0.06 lb/MMBtu.[1] TPY NOx reduced (SRP) and Cost Effectiveness in $/ton (SRP) were calculated using baseline emission rates of 0.49, 0.45, and 0.46 lb/MMBtu for Units 1 – 3, respectively. TPY NOx reduced (EPA) and Cost Effectiveness in $/ton (EPA) were calculated using baseline emission rates of 0.35, 0.37, and 0.31 lb/MMBtu for Units 1 – 3, respectively with post-SCR control NOx emissions of 0.06 lb/MMBtu.[1] TPY NOx reduced (SRP) and Cost Effectiveness in $/ton (SRP) were calculated using baseline emission rates of 0.49, 0.45, and 0.46 lb/MMBtu for Units 1 – 3, respectively. TPY NOx reduced (EPA) and Cost Effectiveness in $/ton (EPA) were calculated using baseline emission rates of 0.35, 0.37, and 0.31 lb/MMBtu for Units 1 – 3, respectively with post-SCR control NOx emissions of 0.06 lb/MMBtu.

### Adapted from TSD for proposed BART determination for NGS

**Table below uses updated cost information from 2010 and 2012 from SRP**

**Option (#)** 

### Cost or Cost **Effectiveness[1] Unit 1**  **Unit 2 Unit 3**  Baseline Rate (2001 - 2003) 0.36 0.36 0.34


### Avg Heat Input (2001-2003) 7616 8120 7913 Avg operating hours (01-03) 8007 8420 7845 Baseline emissions 10,976 12,308 10,554 SCR (Units 1 – 3) Total Capital Investment $151,825,000 $205,808,000 $186,528,000 (Option 4) Total Annual Cost ($/yr) $21,579,000 $27,835,000 $25,601,000 Cost represents SCR only, does not include LNB/SOFA Expected Emission (lb/MMBtu) 0.08 0.08 0.08 % NOxReduction from 2001 - 2003 Baseline 78% 78% 76%

TPY NO xReduced 8,537 9,573 8,070 Cost Effectiveness of SCR

only $2,528 $2,908 $3,172 **Cost represents SCR+LNB/SOFA** Total Capital Investment of SCR+LNB/SOFA $166,825,000 $220,808,000 $201,528,000 Total Annual Cost of SCR+LNB/SOFA $23,317,000 $29,573,000 $27,339,000 Cost Effectiveness of SCR+LNB/SOFA $2,731 $3,089 $3,388

SNCR on Units 1 – 3 Total Capital Investment $13,066,667 $13,066,667 $13,066,667 (Option 2) Total Annual Cost ($/yr) $7,847,333 $7,847,333 $7,847,333 Cost represents SNCR only, does not include LNB/SOFA Expected Emission (lb/MMBtu) 0.15 0.15 0.15 % NOxReduction from 2001 - 2003 Baseline 58% 58% 56% TPY NO xReduced 6,403 7,180 5,898 Cost Effectiveness ($/ton) $1,226 $1,093 $1,331 **Cost represents SNCR+LNB/SOFA** Total Capital Investment of SNCR+LNB/SOFA $28,066,667 $28,066,667 $28,066,667 Total Annual Cost of SNCR+LNB/SOFA $9,585,333 $9,585,333 $9,585,333 Cost Effectiveness of SNCR+LNB/SOFA $1,497 $1,335 $1,625

SNCR on Units 1 – 3 Total Capital Investment $13,066,667 $13,066,667 $13,066,667 (Option 2a) Total Annual Cost ($/yr) $7,847,333 $7,847,333 $7,847,333Cost represents SNCR only, does

not include LNB/SOFA Expected Emission (lb/MMBtu) 0.18 0.18 0.18 % NOxReduction from 2001 - 2003 Baseline 50% 50% 47% TPY NO xReduced 5,488 6,154 4,966 Cost Effectiveness ($/ton) $1,430 $1,275 $1,580 **Cost represents SNCR+LNB/SOFA** Total Capital Investment of SNCR+LNB/SOFA $28,066,667 $28,066,667 $28,066,667 Total Annual Cost of SNCR+LNB/SOFA $9,585,333 $9,585,333 $9,585,333 Cost Effectiveness of SNCR+LNB/SOFA $1,747 $1,558 $1,930

LNB + SOFA on Units 1 – 3 Total Capital Investment $15,000,000 $15,000,000 $15,000,000 (Option 1) Total Annual Cost ($/yr) $1,738,000 $1,738,000 $1,738,000 LNB/SOFA were installed in 2009- 2011 Expected Emission (lb/MMBtu) 0.24 0.24 0.24 % NOxReduction from 2001 - 2003 Baseline 33% 33% 29% TPY NO xReduced 3,659 4,103 3,104 Cost Effectiveness ($/ton) $475 $424 $560



### Notes [1] TPY NOx reduced (SRP) and Cost Effectiveness in $/ton (SRP) were calculated using baseline emission rates of 0.49, 0.45, and 0.46 lb/MMBtu for Units 1 – 3, respectively. TPY NOx reduced (EPA) and Cost Effectiveness in $/ton (EPA) were calculated using baseline emission rates of 0.35, 0.37, and 0.31 lb/MMBtu for Units 1 – 3, respectively with post-SCR control NOx emissions of 0.06 lb/MMBtu. 

### In January 20, 2012 letter from Kelly Barr (SRP) to Deborah Jordan (EPA), SRP provided updated cost estimates for LNB/SOFA, SNCR, and SCR For EPA cost estimates, see Excel workbook in docket titled "EPA cost analysis for NGS.xlsx"

### SRP Incremental Costs Unit 1 Unit 2 LNB/SOFA to SNCR+LNB/SOFA(@0.18) $4,290 $3,826 SNCR+LNB/SOFA (@0.18)) to SCR+LNB/SOFA $4,504 $5,846 LNB/SOFA to SCR+LNB/SOFA $4,424 $5,089

Unit 1 Unit 2 2010 SRP total annual costs of SCR+LNB/SOFA(@0.08) $23,317,000 $29,573,000 2010 EPA total annual cost of SCR+LNB/SOFA (@0.055) $18,701,576 $23,521,090
26,180 2010 EPA total annual cost of

SCR+LNB/SOFA (@0.08) $17,757,647 $22,577,161 tpy reduced (@0.055 lb/MMBtu) from 01-02 baseline 9,299 10,427 EPA Average Cost effectiveness of SCR+LNB/SOFA (@0.055) $2,011 $2,256 EPA Average Cost effectiveness of SCR+LNB/SOFA (@0.08) $2,080 $2,359 $3,069 EPA Incremental Costs Unit 1 Unit 2

LNB/SOFA to SNCR+LNB/SOFA (@0.18) $4,290 $3,826 LNB/SOFA to SCR+LNB/SOFA (@0.055) $3,008 $3,444 SNCR+LNB/SOFA (@0.18) to SCR+LNB/SOFA (@0.055) $2,392 $3,261 19,480 $1,216

$1,486

### 16,608

$1,745

10,865 $486 $480

[1] TPY NOx reduced (SRP) and Cost Effectiveness in $/ton (SRP) were calculated using baseline emission rates of 0.49, 0.45, and 0.46 lb/MMBtu for Units 1 – 3, respectively. TPY NOx reduced (EPA) and Cost Effectiveness in $/ton (EPA) were calculated using baseline emission rates of 0.35, 0.37, and 0.31 lb/MMBtu for Units 1 – 3, respectively with post-SCR control NOx emissions of 0.06 lb/MMBtu. 

### In January 20, 2012 letter from Kelly Barr (SRP) to Deborah Jordan (EPA), SRP provided updated cost estimates for LNB/SOFA, SNCR, and SCR

### Unit 3 Average

$4,214 $4,110 $5,720 $5,357 $5,155 $4,889

Unit 3 Average $27,339,000 $21,794,549 *Note that EPA's cost estimates in other spreadsheet are for SCR only (without LNB/SOFA) $20,850,620 *Note that EPA's cost estimates in other spreadsheet are for SCR only (without LNB/SOFA)
8,846 28,573 $2,464 $2,244 $2,240.50 $2,584 $2,341

Unit 3 Average $4,214 $4,110 $3,493 $3,315 $3,147 $2,933[1] TPY NOx reduced (SRP) and Cost Effectiveness in $/ton (SRP) were calculated using baseline emission rates of 0.49, 0.45, and 0.46 lb/MMBtu for Units 1 – 3, respectively. TPY NOx reduced (EPA) and Cost Effectiveness in $/ton (EPA) were calculated using baseline emission rates of 0.35, 0.37, and 0.31 lb/MMBtu for Units 1 – 3, respectively with post-SCR control NOx emissions of 0.06 lb/MMBtu.

### *Note that EPA's cost estimates in other spreadsheet are for SCR only (without LNB/SOFA) *Note that EPA's cost estimates in other spreadsheet are for SCR only (without LNB/SOFA)[1] TPY NOx reduced (SRP) and Cost Effectiveness in $/ton (SRP) were calculated using baseline emission rates of 0.49, 0.45, and 0.46 lb/MMBtu for Units 1 – 3, respectively. TPY NOx reduced (EPA) and Cost Effectiveness in $/ton (EPA) were calculated using baseline emission rates of 0.35, 0.37, and 0.31 lb/MMBtu for Units 1 – 3, respectively with post-SCR control NOx emissions of 0.06 lb/MMBtu.

### SCR Costs Based on 2010 EPA revisions to SRP estimates Total Annual Cost NOx removed $/year tons per year LNB/SOFA $5,214,000 10,865 SNCR (@0.18) $23,541,999 16,608 SNCR (@0.15) $23,541,999 19,480 SCR (@0.08) $61,185,427 26,180 SCR (@0.055) $64,017,215 28,573

$0 $10,000,000 $20,000,000 $30,000,000 $40,000,000 $50,000,000 $60,000,000 $70,000,000

0 5,000 10,000 15,000 20,000 25,000 30,000 35,000**T o** **t a** **l A** **n n** **u a** **l C** **o s** **t (** **a l** **l 3** **u n** **i t** **s )** 

**Total tons per year NOx removed (all 3 units)** 

# Least Cost Envelope **(EP**

**A estimates)**

LNB/SOFA SNCR (@0.15) SCR (@0.05)

### LNB/SOFA* SNCR+LNB/SOFA SCR+LNB/SOFA (EPA estimate) Total Capital Cost ($ millions) $45 $84 $541

Total Annual Costs ($ millions) $5 $29 $64

### SCR (SRP

estimate)
$589
$80