Scenario SO2 NOx PM

Pre-control 

days >0.5

Postcontrol 

days >0.5 ∆days

Precontrol 

days >1.0

Postcontrol 

days >1.0 ∆days

Precontrol No control Existing LNB Existing ESP 100 --- --- 49 --- ---

Run 1 FGD at 90% Presumptive Existing ESP 100 23 77 49 5 44

Run 2 FGD at 93% Presumptive Existing ESP 100 22 78 49 5 44

Run 3 FGD at 95% Presumptive Existing ESP 100 17 83 49 3 46

Run 4 FGD at 90% SOFA Existing ESP 100 22 78 49 5 44

Run 5 FGD at 93% SOFA Existing ESP 100 19 81 49 4 45

Run 6 FGD at 95% SOFA Existing ESP 100 12 88 49 3 46

Supplemental FGD at 95% SOFA+SNCR Existing ESP NA NA NA NA NA NA

3-year totals

Leland Olds Unit 1 - Days > 0.5 dv and >1.0 dv

Control Option

TRNP-South Unit

3-year totals

Page 1 of 4
Leland Olds Unit 1 - Days > 0.5 dv and >1.0 dv

Scenario SO2 NOx PM

Pre-control 

days >0.5

Postcontrol 

days >0.5 ∆days

Precontrol 

days >1.0

Postcontrol 

days >1.0 ∆days

Precontrol No control Existing LNB Existing ESP 99 --- --- 55 --- ---

Run 1 FGD at 90% Presumptive Existing ESP 99 28 71 55 7 48

Run 2 FGD at 93% Presumptive Existing ESP 99 23 76 55 7 48

Run 3 FGD at 95% Presumptive Existing ESP 99 18 81 55 4 51

Run 4 FGD at 90% SOFA Existing ESP 99 21 78 55 7 48

Run 5 FGD at 93% SOFA Existing ESP 99 18 81 55 4 51

Run 6 FGD at 95% SOFA Existing ESP 99 14 85 55 2 53

Supplemental FGD at 95% SOFA+SNCR Existing ESP NA NA NA NA NA NA

Control Option 3-year totals 3-year totals

TRNP-North Unit

Page 2 of 4
Leland Olds Unit 1 - Days > 0.5 dv and >1.0 dv

Scenario SO2 NOx PM

Pre-control 

days >0.5

Postcontrol 

days >0.5 ∆days

Precontrol 

days >1.0

Postcontrol 

days >1.0 ∆days

Precontrol No control Existing LNB Existing ESP 71 --- --- 32 --- ---

Run 1 FGD at 90% Presumptive Existing ESP 71 23 48 32 5 27

Run 2 FGD at 93% Presumptive Existing ESP 71 13 58 32 3 29

Run 3 FGD at 95% Presumptive Existing ESP 71 10 61 32 3 29

Run 4 FGD at 90% SOFA Existing ESP 71 14 57 32 3 29

Run 5 FGD at 93% SOFA Existing ESP 71 13 58 32 3 29

Run 6 FGD at 95% SOFA Existing ESP 71 8 63 32 2 30

Supplemental FGD at 95% SOFA+SNCR Existing ESP NA NA NA NA NA NA

Control Option

TRNP-Elkhorn Ranch

3-year totals 3-year totals

Page 3 of 4
Leland Olds Unit 1 - Days > 0.5 dv and >1.0 dv

Scenario SO2 NOx PM

Pre-control 

days >0.5

Postcontrol 

days >0.5 ∆days

Precontrol 

days >1.0

Postcontrol 

days >1.0 ∆days

Precontrol No control Existing LNB Existing ESP 130 --- --- 76 --- ---

Run 1 FGD at 90% Presumptive Existing ESP 130 24 106 76 8 68

Run 2 FGD at 93% Presumptive Existing ESP 130 22 108 76 6 70

Run 3 FGD at 95% Presumptive Existing ESP 130 15 115 76 3 73

Run 4 FGD at 90% SOFA Existing ESP 130 22 108 76 5 71

Run 5 FGD at 93% SOFA Existing ESP 130 15 115 76 3 73

Run 6 FGD at 95% SOFA Existing ESP 130 12 118 76 3 73

Supplemental FGD at 95% SOFA+SNCR Existing ESP NA NA NA NA NA NA

Note: Units 1 and 2 were modeled together in the supplemental scenario. Individual unit impacts for the SOFA+SNCR control option were not supplied 

by NDDH.

Control Option

Lostwood NWA

3-year totals 3-year totals

Page 4 of 4
Scenario SO2 NOx PM

Precontrol 

days >0.5

Postcontrol 

days >0.5 ∆days

Precontrol 

days >1.0

Postcontrol 

days >1.0 ∆days

Precontrol No control No control Existing baghouse 142 --- --- 94 --- ---

Run 1 FGD at 95% ASOFA Existing baghouse 142 53 89 94 21 73

Run 2 FGD at 95% ASOFA+SNCR Existing baghouse 142 37 105 94 10 84

Run 3 FGD at 95% ASOFA+SNCR+RRI Existing baghouse 142 32 110 94 9 85

ND Run 1 FGD at 95% ASOFA+SCR Existing baghouse 142 12 130 94 2 92

Leland Olds Unit 2 - Days > 0.5 dv and >1.0 dv

TRNP-South Unit

Control Option 3-year totals 3-year totals

Page 1 of 4
Leland Olds Unit 2 - Days > 0.5 dv and >1.0 dv

Scenario SO2 NOx PM

Precontrol 

days >0.5

Postcontrol 

days >0.5 ∆days

Precontrol 

days >1.0

Postcontrol 

days >1.0 ∆days

Precontrol No control No control Existing baghouse 144 --- --- 88 --- ---

Run 1 FGD at 95% ASOFA Existing baghouse 144 52 92 88 25 63

Run 2 FGD at 95% ASOFA+SNCR Existing baghouse 144 38 106 88 15 73

Run 3 FGD at 95% ASOFA+SNCR+RRI Existing baghouse 144 34 110 88 13 75

ND Run 1 FGD at 95% ASOFA+SCR Existing baghouse 144 7 137 88 1 87

TRNP-North Unit

Control Option 3-year totals 3-year totals

Page 2 of 4
Leland Olds Unit 2 - Days > 0.5 dv and >1.0 dv

Scenario SO2 NOx PM

Precontrol 

days >0.5

Postcontrol 

days >0.5 ∆days

Precontrol 

days >1.0

Postcontrol 

days >1.0 ∆days

Precontrol No control No control Existing baghouse 117 --- --- 61 --- ---

Run 1 FGD at 95% ASOFA Existing baghouse 117 28 89 61 11 50

Run 2 FGD at 95% ASOFA+SNCR Existing baghouse 117 21 96 61 8 53

Run 3 FGD at 95% ASOFA+SNCR+RRI Existing baghouse 117 20 97 61 8 53

ND Run 1 FGD at 95% ASOFA+SCR Existing baghouse 117 9 108 61 1 60

TRNP-Elkhorn Ranch

Control Option 3-year totals 3-year totals

Page 3 of 4
Leland Olds Unit 2 - Days > 0.5 dv and >1.0 dv

Scenario SO2 NOx PM

Precontrol 

days >0.5

Postcontrol 

days >0.5 ∆days

Precontrol 

days >1.0

Postcontrol 

days >1.0 ∆days

Precontrol No control No control Existing baghouse 180 --- --- 112 --- ---

Run 1 FGD at 95% ASOFA Existing baghouse 180 70 110 112 23 89

Run 2 FGD at 95% ASOFA+SNCR Existing baghouse 180 49 131 112 11 101

Run 3 FGD at 95% ASOFA+SNCR+RRI Existing baghouse 180 42 138 112 9 103

ND Run 1 FGD at 95% ASOFA+SCR Existing baghouse 180 8 172 112 2 110

Lostwood NWA

Control Option 3-year totals 3-year totals

Page 4 of 4