# Appendix D

Controls on Large Electric Utility Steam Generating UnitsControls on Large Electric Utility Steam Generating Units

“NOx Emissions from Electric Utility Steam Generating Units” has been codified in Georgia Rule 391-3-1-.02(2)(jjj), hereinafter referred to as Rule (jjj). Rule (jjj) became effective May 1, 1999 for various co al-fired units in the 1-hour ozone nonattainment area. Georgia EPD increased the stringency of the 1999 edition of this rule by revising the rule to include a reduced allowable NOx emission limits as well as an extension to the geographic area covered by the rule. The rule revision increased the stringency of the rule requirements for the ozone seasons beginning in 2000 and 2003. Beginning May 1, 2003, there were two NOx emission standards u nder Rule (jjj) and these standards are referred to as the “5-plant” standa rd and the “7-plant” standard.

Effective May 1, 2003, this air quality control ru le limited NOx from coal-fired units with maximum heat inputs greater than 250 milli on British thermal units per hour (MMBtu/hr) from the affected units in the 13 county A tlanta ozone nonattainment area and in Bartow, Floyd, and Heard counties to new alternative limits and/or 0.13 lb/MMBtu heat input averaged over all affected units (referred to as the “5-plant” standard). Effective May 1, 2003, Rule (jjj) also limited NOx from the same affected units in the 13 county Atlanta ozone nonattainment area, those in Bartow, Fl oyd, and Heard counties, and also units in Monroe and Putnam counties to new alternat ive limits and/or 0.20 lb/MMBtu heat input averaged over all affected units (referred to as the “7-plant” standard). These emission limits apply during the period from May 1 through September 30 of each year on a 30- day rolling average basis.

Georgia EPD is in the process of further rule making to increase the stringency of Rule (jjj), and the new requirements will beco me effective May 1, 2007. The “5-plant” standard will remain unchanged. the “7-p lant” standard will be reduced from 0.20 lb/MMBtu to 0.18 lb/MMBtu and/or new alte rnative unit limits. In addition, a third standard will apply beginning in the 2007 oz one season for Plant Scherer located in Monroe County. The facility-wide Plant Schere r standard will be se t at 0.17 lb/MMBtu. As noted earlier, these emission limits will apply during the period from May 1 through September 30 of each year on a 30-day rolling average basis.

Compliance with Rule (jjj) is determined, poten tially, in two steps. First, each source is assigned (in an air quality permit) a specific alternative emission limit that will be a 30- day rolling average limit. The source-sp ecific alternative emission limits will be established such that the weighted average of all of the source-specific emission limits, using the maximum heat input capacity for each source, will equal the 30-day rolling average lb/MMBtu limit in the Rule (i.e., “5-plant” standard of 0.13 lb/MMBtu; “7-plant” standard before 2007 of 0.20 lb/MMBtu, etc.). If each source is complying with its specific alternative emission limit, compliance withRule (jjj) is satisfied. If the actual emission rate from any source is greater than its alternative emission limit, then compliance shall be achieved by demonstrati ng that the actual Btu-weighted average emissions rate for all affected sources is less than the 30-day rolling average limit in the Rule.

D-1Compliance with a 30-day rolling average a lternative emission limit is determined by performing a weighted average, using the ac tual hourly source h eat inputs (MMBtu/hr), of all of the hourly NOx emission rates (lb/MMBtu) for the periods of operation of the source during a 30 consecutive day source opera tional period. To determine compliance with a 30-day rolling average emission limit speci fied in the Rule (i.e., “5-plant” standard of 0.13 lb/MMBtu; “7-plant” standard befo re 2007 of 0.20 lb/MMBtu, etc.), you would perform a weighted average, using the actual source heat i nputs (MMBtu/hr), of all the hourly NOx emission rates for all of the a ffected sources during a 30 consecutive day period.

Georgia Power operates seven coal-fired power plants in the counties covered by Rule (jjj): Plants Bowen, Br anch, Hammond, McDonough-Atkins on, Scherer, Wansley, and Yates.

Plant Bowen includes four coal-fired units , identified as Bowen Units 1, 2, 3, and 4. Each of these units is equi pped with combustion modifica tions consisting of Low NOx Burners and Overfire Air (OFA) as well as being equipped with its own dedicated selective catalytic reducti on (SCR) equipment for the reduction of NOx emissions.

Plant Branch includes four coal-fired units , identified as Branch Units 1, 2, 3, and 4. These units utilize Low NOx Burners (LNB ) for the reduction of NOx emissions.

Plant Hammond has four coal-fired units, iden tified as Hammond Units 1, 2, 3, and 4. Each unit is equipped with Low NOx Burn ers (LNB). In 2000, Plant Hammond received an air quality permit amendment to construct (June 15, 2000) and operate (September 18, 2000) selective catalytic reduc tion (SCR) equipment for the reduction of NOx emissions on Hammond Unit 4 (SG04).

Plant McDonough includes two coal-fired units , identified as McDonough Units 1 and 2. Each unit is equipped with Low NOx Burner s (LNB) and Overfire Air. In addition, Georgia Power co-fires these units with na tural gas during the oz one season to aid in complying with Georgia Rule (jjj).

Plant Scherer includes four co al-fired units, identified as Scherer Units 1, 2, 3, and 4. Each unit is equipped with Low NOx Burners (LNB) and Overfire Air. Plant Scherer switched from eastern to west ern coal on Units 1 and 2 in 2003 and on Units 3 and 4 in 2004 to reduce NOx emissions.

Plant Wansley includes two coal-fired units, identified as Wansley Units 1 and 2. Each unit is equipped with Low NOx Burners (LNB ) and Overfire Air (OFA). In 2000, Plant Wansley received an air quality permit amendment to construct (June 15, 2000) and operate (November 6, 2000) selective catal ytic reduction (SCR) equipment for the reduction of NOx emissions on Wansley Units 1 and 2.

Plant Yates includes seven coal-fired units a nd these are identified as Yates Units 1, 2, 3, 4, 5, 6, and 7. Units 1, 4, 5, 6, 7 are equipped with Low NOx Burners (LNB) and

D-2Overfire Air (OFA). In addition, Georgia pow er co-fires these un its with natural gas during the ozone season to aid in co mplying with Georgia Rule (jjj).

The information described above is presente d in the following table for illustrative

purposes. Plant/Unit NOx Base (lb/MMBtu) NOx Control Method NOx Target (lb/MMBtu) Bowen 1 0.43 LNB/OFA/SCR 0.07 Bowen 2 0.44 LNB/OFA/SCR 0.07 Bowen 3 0.44 LNB/OFA/SCR 0.07 Bowen 4 0.44 LNB/OFA/SCR 0.07 Branch 1 0.99 LNB 0.50 Branch 2 0.72 LNB 0.50 Branch 3 0.83 LNB 0.50 Branch 4 0.83 LNB 0.50 Hammond 1 0.86 LNB 0.42 Hammond 2 0.86 LNB 0.42 Hammond 3 0.86 LNB 0.42 Hammond 4 0.43 LNB/OFA/SCR 0.07 McDonough 1 0.30 LNB/OFA 0.26 McDonough 2 0.30 LNB/OFA 0.26 Scherer 1 0.52 OFA FUEL SWITCH 0.30

Scherer 2 0.53 OFA FUEL SWITCH 0.30

Scherer 3 0.30 OFA FUEL SWITCH 0.15

Scherer 4 0.32 OFA FUEL SWITCH 0.20

Wansley 1 0.40 LNB/OFA/SCR 0.07 Wansley 2 0.43 LNB/OFA/SCR 0.07 Yates 1 0.30 LNB 0.38 Yates 2 0.30 N/A 0.38 Yates 3 0.30 N/A 0.38 Yates 4 0.30 LNB 0.33 Yates 5 0.30 LNB 0.33 Yates 6 0.30 LNB/OFA 0.26 Yates 7 0.30 LNB/OFA 0.26 LNB = Low NOx Burner OFA = Overfired Air FUEL SWITCH = Switch from eastern to western coal

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