Basin Elecric 

## Attachment A: Capital, O&M Cost for Tail-End SCR

Scenarlo E Scenarlo F Scenario G Scenarlo H Scenarlo I Input Data Low Dust Low Dust Low Dust Low Dust Low Dust DeSign Coal lignite Lignite lignite Llcnlte lignite Heallnpul MBluihr 5,130 5,130 5,130 5,130 5,130 NOx Emission IblMMSlu 0.48 0.48 0.48 0.48 0.48 NOx Removal Efficiency 

### % 90

.00 9000 9000 90.00 90.00 NOx Removed (Calc

.) Ibihr 2 ,216 2 ,216 2 ,216 2,216 2,216 NOx Remove d lonstyr 9,334 8,962 8,962 8,962 8,962 Ammonia Required' (Calc ,) Ibihr 873 873 873 873 873 Ammonia Cost Slion 450 450 450 450 700 Pressure Drop across caialy sl inw.c 400 400 4 .00 4 ,00 4

.00 Pressure Drop jnw

.c . 18 .0 18 .0 1 8 ,0 18

.0 18.0 Power Co nsumpllon kW 6,956 6,956 6,956 6,956 6 ,956 Power Cost SIM'M 50()() 5000 50.00 50,00 50.00 TemperalUre Rise Across Sleam 10 Flue Gas Rehealer F 50 50 50 50 50 Nalural Gas Requiremenl MBluihr 115 115 11 5 115 115 (50 F risel (50 F rise) (50 F rise ) (50 F rise) (50 F rise) Nalural Gas Cost SIMBtu 8.00 8.00 12

.00 12 ,00 1200 Coal Cost SIMStu 1.00 100 1 ,00 1.00 1

.00 Catal yst Cost $ 3,960 ,000 3,960,000 3,960,000 3,960,000 3 ,960,000 Total Capital Cost for 5CR S 154000 000 154 000 000 164 000 000 154 000 000 154000 000 Total Capital Cost for 503 mlliQallon 

### S 

## a a a 5 000 000 6 000 000 Total Capital Cost S 164 000 000 164000 000 164 000 000 159 000 000 159 000 000 Annual Capacity Factor 

### % 96.164 923 92

.3 923 923 Outage to replace catal' st weeks 20 40 4.0 4,0 40 Cost of outage Slweek 3,696,000 3,6960 00 3 ,696 000 3 ,696 ,()()0 3,696 ,000 Catalyst Replacement frequency 12 months 6 months 6 months 6 months Smonths 

### Fixed O&M Costs Scenarlo E Scenarlo F Scenario G Scenario H Scenario I 

### SCR 1

. Ope ra ling Lab or Cost (Slyr) SO SO SO SO SO 

### 2, Maintenance Materials Cos t (Slyr) $462,000 .462 ,000 S462 ,000 .477 ,000 5477,000 3, Maintenance Labor Cost (Slyr) S308,000 S308,000 S308 ,000 S318,000 S318 ,000 4

. Adm inistrative and Support Lab or SO SO SO SO SO Total (Styr) S770,000 .770,000 $770,000 $795 ,000 $795 ,000 

### S03 MItigation Total (Sly r) SO SO SO S150,000 $150,000

Total Annual Fixed O&M Cost $770,000 $770 ,000 $770,000 $945,000 $945 , 000


### Variable 0l1eratJng Costs Scenario E Scenarlo F Scenarlo G Scenarlo H Scenarlo I 

### SCR 1

. Ammonia Cost (Styr) Annual 1,655 ,000 1,589,000 1,589,000 1 ,589,000 2,471 ,000 2 Catalyst Cost' (Slyr) Annual 3 ,960 ,000 7,920 ,000 7,920,000 7,920,000 7,920,000 3 , Power Cost, Slyr Annual 2 ,930 ,000 2,813 ,000 2,813,000 2,813,000 2,813,000 4. Gas Penalty , Slyr Annual 7,750,000 7,4 41 ,000 11,161 ,000 11 ,161,000 11,161,000 5. Outage Penalty , Slyr Annual 7,392,000 14 ,784,000 14 ,784 ,000 14,784 ,000 14,784 ,000 Total (.Iy r) 23,687,000 34,547,000 38 ,267,000 38,267 ,000 39 , 149 ,000


### S03 Mitigation Total (Slyr) Annual 

## a 0 

## a 207,000 207,000 Total Variable O&M Cost Annual 23 , 687 ,000 34,647,000 38,267 , 000 38,474,000 39,356,000 TOTAL O&M COSTS Annual 24,457,000 35,317 ,000 39,037,000 39,419,000 40,301,000

Sargenl & Lundy

# SCR Power Consumption (High/Low Dust) High Dust Low Dust 

# Gross Power, MW 440 440 ID fans

Increase in Fan HP 3,625 8,157 Increase in Motor kW 2,705 6,085
Ammonia System Power

Ammonia Consumption, Iblhr 1091 873 Power Consumption , kW 109 87 2 x 20 kW Heaters 2 x 20 kW Heaters Dilution Air Blower

Power Consumption, HP 128.0 102.0 Power Consumption , kW 95.5 76.1 Connected Air Blowers, kW 2 x 20 2 x 20
Dilution Air Heaters

Power Consumption, kW 387.1 309
.7 Connected Heaters, k W 2 x 75 2 x 75
Ammonia Pump

Power Consumption, HP 2.4 1.9 Power Consumption, kW 1.8 1.4
Seal Air Fans

Power Consumption, HP 88 88 Power Consumption, kW 66 66 Connected Seal air fan, k W 2 x 125 2 x 125

Sub-Total Power Consumption, kW 3363 6625
Electrical and Control Power Consumption, kW 

# 168 331
Total Power Consumption, kW 

# 3531 6956 % 

# of Gross 0.80 1.58