Source: EPA Clean Air Markets Division, Acid RainDatabaseAnnual Emissions NOx (tons/yr)19961997199819992000200120022003200420052006Hunter 173467206.4817542.4726493.0347071.0544522.5927447.3437169.2615881.8186063.1917287.805Hunter 272256597.2998644.2296837.4166944.7516749.625750.1325776.5146238.0466093.2035595.034Huntington 183315742.4417378.0547544.9737294.8935828.4486236.7635767.5515025.0724660.1716143.811Huntington 280917617.3846744.3197466.5277157.0596347.0324946.36156.0255645.0115507.0074986.61Annual Heat Input19961997199819992000200120022003200420052006Hunter 13582771034862790371904843224611031903607218391073569277536586802333934883355466737638145Hunter 23549939932981408423783223766403032968550329766282947071432166351352857893507314432252702Huntington 13474397430642149367323343666638333616500282609753215177633685018297867382958769432929773Huntington 23364346737533807342836683769552834259898304347532499920834266030308664003251482426754943Annual Avg NOx Emission Rate19961997199819992000200120022003200420052006Hunter 10.410.400.400.440.400.410.390.350.360.38Hunter 20.400.410.360.420.400.380.360.350.340.34Huntington 10.370.400.410.430.400.380.340.340.310.37Huntington 20.400.390.390.420.410.390.360.360.340.37Source: EPA Clean Air Markets Division, Acid RainDatabaseAnnual Emissions NOx (tons/yr)Hunter 1Hunter 2Huntington 1Huntington 2Annual Heat InputHunter 1Hunter 2Huntington 1Huntington 2Annual Avg NOx Emission RateHunter 1Hunter 2Huntington 1Huntington 22007200820092010201120122013Avg 12-136710.217043.8626006.9174970.7195350.5935998.663606660326032.3315000006797.0037018.8675935.6085435.8263405.7583176.3943647.534123411.9470000005973.8676058.8845809.1034574.0223608.4583576.134360935933592.5670000004400.5784099.5943960.1763709.3262643.4053815.0573872.638443843.8285000002007200820092010201120122013Avg 12-1335930750373345743398150627784026301393473124471530759676310021953628828537217115340403613050559228157677331302003430083633715518325960243340866632387241269319073222762232108461325822323234534737803134373040523538000134005138259906233418648934254621342205552007200820092010201120122013Avg 12-130.370.370.350.350.350.380.380.380.370.380.340.350.240.190.210.200.360.360.360.340.220.220.220.220.230.220.220.220.200.220.220.22Source: EPA Clean Air Markets Division, Acid Rain DatabaseAnnual Emissions NOx (tons/yr)Avg 12-13Hunter 13137.363actual value = 6032.3315, however, value is set relative to Hunter 2 (see note 1)Hunter 23411.947Huntington 13592.567Huntington 23843.829Annual Heat InputAvg 12-13Hunter 131002195Hunter 233715518Huntington 132345347Huntington 234220555Annual Avg NOx Emission RateAvg 12-13Hunter 10.26actual value = .3802; however, value is set equal to permitted value of 0.26 (see note 2)Hunter 20.2004Huntington 10.2214Huntington 20.22115Note 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 actual emissionspre-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 adjusted to equalthose 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 than the finalpermitted value following completion of all required control system upgrades. Therefore, the annual average NOx emission rate has been set equal to the permitted value of 0.26 lb/MMBtu(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 visibilitymodeling 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. For SNCRPacifiCorp 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 assumed equal to0.2 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 case.This 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 confusionwith 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 theemission 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 operating.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 the cost valuesprovided 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 - SummaryHunter 1Hunter 2Huntington 1Huntington 2Case 2SNCR+LNB+OFACost per Ton ($/Ton)5,105.71$4,684.30$3,786.55$3,407.29$Case 3SCR+LNB+OFACost per Ton ($/Ton)9,924.78$9,072.05$8,375.20$7,804.09$Revised Table 1Hunter 1Hunter 2Huntington 1Huntington 2Average Annual lb/MMBtu Rate0.2600.2000.2210.221Annual Heat Input31002195.19633715518.03332345346.61334220554.707Annual NOx Emissions (tons/year)3137.3633411.9473592.5673843.829Average Annual lb/MMBtu Rate0.1600.1600.1660.166Annual NOx Emissions (tons/year)2485.1362702.6362685.4722837.953Annual NOx value for SNCR is based on .75 of Case 1 if original NOx value is > .2 and .8 of Case 1 if <= .2Average Annual lb/MMBtu Rate0.0500.0500.0500.050Annual NOx Emissions (tons/year)775.055842.888808.634855.514Table 2 - Control CostsHunter 1Hunter 2Huntington 1Huntington 2Annual NOx Emissions (tons/year)3137.3633411.9473592.5673843.829Total Annualized Cost1,093,709.00$837,474.00$785,826.00$808,199.00$Cost per Ton ($/Ton)-$-$-$-$Case 1Case 2Case 3LNB+OFASNCR+LNB+OFASCR+LNB+OFACase 1LNB+OFAAnnual NOx Emissions (tons/year)2485.1362702.6362685.4722837.953Total Annualized Cost3,330,080.00$3,322,629.00$3,434,755.00$3,427,305.00$Cost per Ton ($/Ton)5,105.71$4,684.30$3,786.55$3,407.29$Annual NOx Emissions (tons/year)775.055842.888808.634855.514Total Annualized Cost23,445,385.00$23,306,624.00$23,315,986.00$23,321,067.00$Cost per Ton ($/Ton)9,924.78$9,072.05$8,375.20$7,804.09$SCR+LNB+OFACase 2SNCR+LNB+OFACase 3