68A. 30-Day Rolling Average NOx Emission Rate at Rockport. Beginning on the thirtieth Day which is an Operating Day for either one or both Rockport Units in calendar year ​, average NOx emissions from the Rockport Units shall be limited to 0.090 lb/mmBTU on a 30-day Rolling Average Basis at the combined stack for the Rockport Units. Emissions shall be calculated in accordance with the provisions of Paragraph ​ and reported in accordance with the requirements of Paragraph J in ​.

5A. A “30-Day Rolling Average NOx Emission Rate at Rockport. Beginning onRate” for Rockport means, and shall be expressed as, lb/mmBTU and calculated in accordance with the thirtiethfollowing procedure: first, sum the total pounds of the pollutant in question emitted from the combined Rockport stack during a Day which is an Operating Day for either oneor both Rockport Units, and the previous twenty-nine (29) such Days; second, sum the total heat input to both Rockport Units in mmBTU during the Day which was an Operating Day for either or both Rockport Units, and the previous twenty-nine (29) such Days; and third, divide the total number of pounds of the pollutant emitted during the thirty (30) Days which were Operating Days for either or both Rockport Units in calendar year ​, average NOx emissions fromby the Rockport Units shall be limited to 0.090 lb/mmBTU on atotal heat input during the thirty such Days. A new 30-dayDay Rolling Average Basis at the combined stack for the Rockport Units. EmissionsEmission Rate shall be calculated in accordance with the provisionsfor each new Day which is an Operating Day for either or both Rockport Units. Each 30-Day Rolling Average Emission Rate shall include all emissions that occur during all periods of Paragraph ​startup, shutdown, and reported in accordance with the requirements of Paragraph J in ​.Malfunction within an Operating Day, except as follows:

68B. Informational NOx Monitoring. During the ozone seasons (May 1 - September 30) in each of calendar years 2019 and 2020, prior to the effective date of the 30-Day Rolling Average NOx Emission Rate at Rockport. Beginning on the thirtieth Day which is an Operating Day for either one or both Rockport Units in calendar year ​,Paragraph 68A, the AEP Defendants shall provide an estimate of the 30-day rolling average NOx emissions from Rockport Unit 1, based on NOx concentrations and percent ​ measured at an uncertified NOx monitor in the duct from Unit 1 before the flue gases from Rockport Units shall be limited to 0.090 lb/mmBTU on a 30-day Rolling Average Basis1 and 2 combine at the combined stack for the Rockport Units. Emissionscommon stack. Hourly NOx rates shall be calculated in accordance withfor each hour for which valid data is available, using the provisions of Paragraph ​ and reported in accordance with the requirements of Paragraph J in ​.following equation:

In addition to the Plant-Wide Annual Tonnage Limitation for ​ at Rockport. BeginningRockport, beginning on the thirtieth Day which is an Operating Day for either one or both Rockport Units in calendar year ​, average NOx​ emissions from the Rockport Units shall be limited to 0.09015 lb/mmBTU on a 30-dayDay Rolling Average Basis at the Rockport combined stack (30-Day Rolling Average Emission Rate for the Rockport Units.​ at Rockport). Emissions shall be calculated in accordance with the provisions of Paragraph ​ and reported in accordance with the requirements of Paragraph J in ​. Nothing in this Consent Decree shall be construed to prohibit the AEP Defendants from further optimizing the Enhanced DSI system, utilizing alternative sorbents, or upgrading the ​ removal technology at the Rockport Units so long as the Units maintain compliance with the 30-day Rolling Average Emission Rate for ​ at Rockport and the 30-day Rolling Average Emission Rate for NOx at Rockport.