Source: EPA Clean Air Markets Division, Acid Rain Database

Annual Emissions NOx (tons/yr)

1996 1997 1998 1999 2000 2001 2002 2003 2004 

Hunter 1 7346 7206.481 7542.472 6493.034 7071.054 4522.592 7447.343 7169.261 5881.818 606Hunter 2 7225 6597.299 8644.229 6837.416 6944.751 6749.62 5750.132 5776.514 6238.046 609Huntington 1 8331 5742.441 7378.054 7544.973 7294.893 5828.448 6236.763 5767.551 5025.072 466Huntington 2 8091 7617.384 6744.319 7466.527 7157.059 6347.032 4946.3 6156.025 5645.011 550Annual Heat Input

1996 1997 1998 1999 2000 2001 2002 2003 2004 

Hunter 1 35827710 34862790 37190484 32246110 31903607 21839107 35692775 36586802 33393488 3355Hunter 2 35499399 32981408 42378322 37664030 32968550 32976628 29470714 32166351 35285789 3507Huntington 1 34743974 30642149 36732334 36666383 33616500 28260975 32151776 33685018 29786738 2958Huntington 2 33643467 37533807 34283668 37695528 34259898 30434753 24999208 34266030 30866400 3251Annual Avg NOx Emission Rate

1996 1997 1998 1999 2000 2001 2002 2003 2004 

Hunter 1 0.41 0.40 0.40 0.44 0.40 0.41 0.39 0.35 Hunter 2 0.40 0.41 0.36 0.42 0.40 0.38 0.36 0.35 Huntington 1 0.37 0.40 0.41 0.43 0.40 0.38 0.34 0.34 Huntington 2 0.40 0.39 0.39 0.42 0.41 0.39 0.36 0.36 
Source: EPA Clean Air Markets Division, Acid Rain Database

Annual Emissions NOx (tons/yr)Hunter 1Hunter 2Huntington 1Huntington 2Annual Heat InputHunter 1Hunter 2Huntington 1Huntington 2Annual Avg NOx Emission RateHunter 1Hunter 2Huntington 1Huntington 2

2007 2008 2009 2010 2011 2012 2013 Avg 12-13

6710.21 7043.862 6006.917 4970.719 5350.593 5998.663 6066 6032 

6797.003 7018.867 5935.608 5435.826 3405.758 3176.394 3647.5 3412 5973.867 6058.884 5809.103 4574.022 3608.458 3576.134 3609 3593 4400.578 4099.594 3960.176 3709.326 2643.405 3815.057 3872.6 3844 

2007 2008 2009 2010 2011 2012 2013 Avg 12-13

35930750 37334574 33981506 27784026 30139347 31244715 30759676 3100219536288285 37217115 34040361 30505592 28157677 33130200 34300836 3371551832596024 33408666 32387241 26931907 32227622 32108461 32582232 3234534737803134 37304052 35380001 34005138 25990623 34186489 34254621 34220555

2007 2008 2009 2010 2011 2012 2013 Avg 12-13

0.37 0.37 0.35 0.35 0.35 0.38 0.38 0.380.37 0.38 0.34 0.35 0.24 0.19 0.21 0.200.36 0.36 0.36 0.34 0.22 0.22 0.22 0.220.23 0.22 0.22 0.22 0.20 0.22 0.22 0.22
Source: EPA Clean Air Markets Division, Acid Rain Database

Annual Emissions NOx (tons/yr)

Avg 12-13

Hunter 1 3137.363 actual value = 6032.3315, however, value is set rHunter 2 3411.947Huntington 1 3592.567Huntington 2 3843.829Annual Heat Input

Avg 12-13

Hunter 1 31002195Hunter 2 33715518Huntington 1 32345347Huntington 2 34220555Annual Avg NOx Emission Rate

Avg 12-13

Hunter 1 0.26 actual value = .3802; however, value is set equal Hunter 2 0.2004Huntington 1 0.2214Huntington 2 0.22115Note 1 - average Annual Emissions of NOx for Hunter 1 are set equal to those for Hunter 2. Hunter 1 had not yet completed control upgrades and therefore reported actuapre-control for both 2012 and 2013. As Hunter Units 1 and 2 are identical in size, designed firing rate, fuel type, control systems, etc. the annual emissions have been adjustthose from Hunter 2 based on the annual heat input.Note 2 - as listed above in Note 1, Hunter Unit 1 had not yet completed control upgrades during the 2012-13 period. Thus, the annual average NOx emission rate is higher tpermitted value following completion of all required control system upgrades. Therefore, the annual average NOx emission rate has been set equal to the permitted value o(last update DAQE-AN102370022-14 issued April 6, 2014)Note 3 - NOx annual average is shown in revised Table 1 on next sheet as per methodology used by PacifiCorp in August 5, 2014 update. Values shown above are for visibilimodeling purposes and not for calculation of cost per ton. Cost per ton values are based on an assumed "permitted" limit that would be established on an annual average. PacifiCorp used 0.75 * Case 1 if Case 1 was <= 0.2 lb/MMBtu and 0.8 * Case 1 if > 0.2 lb/MMBtu. For purposes of this exercise, Hunter 2's annual average emission rate was 0.2 lb/MMBtu and therefore the SNCR rate was set at 0.150 lb/MMBtu. As per Note 2 above, Hunter 1's SNCR rate was set equal to Hunter 2.
Making the assumption (for now) that the various cost data used by PacifiCorp is valid, the following rework of cost per ton is provided:

As Hunter Unit 1 and 2 and Huntington Unit 1 and 2 have already completed (as of August 1, 2014) all required control system upgrades, this represents a new baseline caseThis new baseline case (Case 1) is also the case previously referred to as the LNB/OFA case, as the original baseline was "uncontrolled." Therefore, rather than causing confwith references to either an "old" or "new" baseline case, I will simply use the following:Case 1 = LNB/OFACase 2 = SNCR + LNB/OFACase 3 = SCR + LNB/OFAReworking Table 1 from Section 2, Page 5 (of 10) of PacifiCorp's BART Analysis Update from August 5, 2014 is required. Case 1 now represents the current state of the emission units and any attempt to compare emissions to a state prior to this would be problematic. The emission controls of LNB plus OFA have already been installed and This new version of Table 1 is found on the next sheet.In order to then come up with a revised control cost in dollars per ton, that cost differential would be determined as follows:[ Cost of control option ] - [ Cost of Case 1 ] ---------------------------------------------------- [Emissions under Case 1 ] - [ Emissions under control option ]Where the control option would, for purposes of this discussion, be either Case 2 or Case 3. The calculations for this can be found on the next sheet, again assuming that thprovided by PacifiCorp are valid. The cost of the control options for both Case 2 and Case 3 as provided by PacifiCorp already include the installation of both LNB and OFA (at different annualized costs for each unit), these values (found in Table 1) must besubtracted from the cost of the control option.This gives us the new control costs shown in Table 2. Taking these values from the next sheet, the "final" control costs would then be as follows:

Table 2 - Summary

Hunter 1 Hunter 2 Huntington 1 Huntington 2

Case 2SNCR+LNB+OFA

Cost per Ton ($/Ton) $ 5,105.71 $ 4,684.30 $ 3,786.55 $ 3,407.29

Case 3SCR+LNB+OFA

Cost per Ton ($/Ton) $ 9,924.78 $ 9,072.05 $ 8,375.20 $ 7,804.09
Revised Table 1

Hunter 1 Hunter 2 Huntington 1 Huntington 2

Average Annual lb/MMBtu Rate 0.260 0.200 0.221 0.221Annual Heat Input 31002195.196 33715518.033 32345346.613 34220554.707Annual NOx Emissions (tons/year) 3137.363 3411.947 3592.567 3843.829Average Annual lb/MMBtu Rate 0.160 0.160 0.166 0.166Annual NOx Emissions (tons/year) 2485.136 2702.636 2685.472 2837.953

Annual NOx value for SNCR is based on .75 of Case 1 if original NOx value is > .2 and .

Average Annual lb/MMBtu Rate 0.050 0.050 0.050 0.050Annual NOx Emissions (tons/year) 775.055 842.888 808.634 855.514Table 2 - Control Costs

Hunter 1 Hunter 2 Huntington 1 Huntington 2

Annual NOx Emissions (tons/year) 3137.363 3411.947 3592.567 3843.829Total Annualized Cost $ 1,093,709.00 $ 837,474.00 $ 785,826.00 $ 808,199.00Cost per Ton ($/Ton) $ - $ - $ - $ - Case 1 Case 2 Case 3 LNB+OFA SNCR+LNB+OFA SCR+LNB+OFA Case 1 LNB+OFA
Annual NOx Emissions (tons/year) 2485.136 2702.636 2685.472 2837.953

Total Annualized Cost $ 3,330,080.00 $ 3,322,629.00 $ 3,434,755.00 $ 3,427,305.00Cost per Ton ($/Ton) $ 5,105.71 $ 4,684.30 $ 3,786.55 $ 3,407.29Annual NOx Emissions (tons/year) 775.055 842.888 808.634 855.514Total Annualized Cost $ 23,445,385.00 $ 23,306,624.00 $ 23,315,986.00 $ 23,321,067.00Cost per Ton ($/Ton) $ 9,924.78 $ 9,072.05 $ 8,375.20 $ 7,804.09

SCR+LNB+OFA

Case 2

SNCR+LNB+OFA

Case 3