Row Midwest Generation SO2 Emissions ‐  2012 2013 2014 2015 2016 2017 2

1 CPS emission rates (lb/mmBtu) 0.44 0.41 0.28 0.195

2 SO2 emissions with CPS business as usual (tons) 2 65,341 60,886 37,699 26,255 

3 Variance CPS emission rates (lb/mmBtu) 0.44 0.41 0.38 0.38

4

SO2 emissions with variance CPS emission rates (tons)3 65,341 60,886 51,163 51,163

5

SO2 mass emission level limits under the variance (tons) 57,000 54,000 39,000 37,000 

6

Reductions beyond what is required by CPS attributable

to Fisk shutdown in 2012 (tons) 734 3,781 3,781 3,781

7

Reductions beyond what is required by CPS attributable

to Crawford shutdown in 2012 (tons)4 1,249 5,961 5,961 5,961 5,961 5,961 2,

8

Emissions increase at Waukegan unit 7 due variance

(tons) 2,957

9

SO2 emissions with variance CPS emission rates (row 4 )

minus reductions not required by CPS (rows 6 & 7) plus

emissions increase due to variance (row 8) (tons) 55,599 54,101 41,421 45,202

10

Emissions expected under variances (lower of row 5 or

row 9) (tons) 55,599 54,000 39,000 37,000 

11

Excess emissions reductions under variance due to early

shutdown of Fisk & Crawford in 2012 (tons) 1,983 5,961 2,

12

Difference between emissions expected under variance

and CPS "business as usual" emissions for the 2013‐2016

time period (tons) (row 2 total ‐ row 10 total) 

13

Difference between emissions expected under variance

and CPS business as usual emissions (tons) (‐row 11 for

years 2012, 2017 & 2018 and row 10 ‐ row 2 for years

2013‐2016) ‐1,983 ‐9,742 ‐6,886 1,301 10,745 ‐5,961 ‐2

14 Total cumulative difference (tons) ‐1,983 ‐11,725 ‐18,611 ‐17,310 ‐6,565 ‐12,527 ‐15

Midwest Generation SO2 Emissions1

1Generated by EPA using data found in Attachment 1, Exhibit 5 of IEPA's August 18, 2014 submittal and Attachment 1, Exhibit 9 of IEPA's May 

submittal

3Based on average 2008‐2011 heat input for the units legally permitted to operate in 2013‐2016, respectively, and the variance CPS emission 3Note that Exhibit 9 of Attachment 1 to IEPA's May 16, 2013 submittal shows 2015‐2018 emissions from Crawford of 23,845 tons (5961 tons 

units 7 and 8). However, while the CPS doesn't require unit 7 to install an FGD or shutdown until 12/31/2018, the CPS requires that unit 8 ins

shutdown by 12/31/2017. Therefore, in this table the reductions were divided by year and no emission reduction was assumed for unit 8 in 2

2Based on average 2008‐2011 heat input for the units legally permitted to operate in 2013‐2016, respectively, and the emission rates allowed 

original CPS (row 1)
2012 2103 2014 2015 2016 2017 2018 

Projected PM emissions at Waukegan

7 in 2014 without

variance (tons) 140

Projected PM emissions at Waukegan

7 in 2014 with

variance (tons) 157

Increase in expected emissions at Waukegan

7 in 2014

due to variance (tons) 17

Estimated reductions at Fisk and Crawford with variance

(shutdown) (tons)2 299 1579 1579 1579 884 884 345

Reductions in PM emissions with variance (tons) 299 1,579 1,562 1,579 884 884 345 

Midwest Generation PM Emissions1

1Generated by EPA using data found in Attachment 1, Exhibit

9 of IEPA's May 16, 2013 submittal 2Note that Exhibit

9 of Attachment 1 to IEPA's May 16, 2013 submittal shows 2015‐2018 emissions from Crawford of 3,536 to

tons per year from units

7 and 8). However, while the CPS doesn't require unit

7 to install an FGD or shutdown until 12/31/2

CPS requires that unit

8 install an FGD or shutdown by 12/31/2017. Therefore, in this table the reductions were divided by ye