Exelon Medway Station (ORIS #1592) 9 Summer Street, Medway, MA CO2 Budget Program (310 CMR 7.70) – Hardcopy CO2 Monitoring Plan Overview The Exelon Medway electric generating station (ORIS #1592), located at 9 Summer Street in Medway, MA, consists of six Rolls-Royce AVON simple-cycle peaking turbines, designated: J1T1, J1T2, J2T1, J2T2, J3T1 and J3T2. Diesel oil is the primary fuel. The units are permitted to burn natural gas as well; however, the site does not presently contain any infrastructure to enable natural gas combustion. The six turbines are arranged as three pairs (“twins”), with each pair serving a single electric generator. These twins may run together or separately. The rated nameplate capacity of each electric generator is 45MW. The six units have been subject to the existing NOx Budget Trading Program (310 CMR 7.28) and will be subject to the upcoming ozone season CAIR program (310 CMR 7.32) and CO2 Budget Trading Program (310 CMR 7.70). They are classified as Low Mass Emissions (LME) Units, as defined in 40 CFR 75.19 and have been reporting emissions as such under the NOx Budget Program. A NOx Budget monitoring plan was previously submitted under Transmittal W024227, and all enclosed information (including the units’ LME designation, and electric output monitoring plan) is remaining unchanged. This document comprises the CO2 monitoring plan required under 310 CMR 7.70(8)(e)(2). These LME units do not utilize any CEMS or DAHS; therefore, a DAHS verification test is not applicable to this submittal. The EDR generation software will be updated prior to January 1, 2009 and will include the CO2 calculation formula detailed below. If applicable, a CO2 formula verification will be forwarded to MassDEP at that time. Monitoring of CO2 Mass Emissions: In accordance with 310 CMR 7.70(8)(a)(3)(c), the hourly CO2 mass emissions for the six low mass emissions (LME) units at Medway Station shall be determined using Equation LM-11 from 40 CFR 75.19: WCO 2 EFCO 2 HI hr (Eq. LM-11) Where: WCO2 = the hourly CO2 mass emissions (tons) EFCO2 = the fuel-based CO2 emission factor as specified by 40 CFR 75.19, Table LM-3 (0.081 tons/mmBTU for oil combustion; 0.059 tons/mmBTU for natural gas combustion) Oil is the only fuel combusted by Medway Station. As long as there is no natural gas combustion capability at Medway, the oil emission factor will be used for all unit operating hours. If natural gas combustion capability is added to Medway Station at a later date, then: if more than one fuel is combusted in the hour, the oil emission factor will conservatively be used. If records are missing as to which fuel was combusted in the hour, the oil emission factor will conservatively be used. HIhr = the unit’s maximum rated hourly heat input (i.e., 392.3 mmBTU/hr for each unit, consistent with that reported under the NOx Budget Program), multiplied by the operating time of the unit for each hour. The quarterly CO2 mass emissions (tons) for the low mass emissions unit shall be the sum of all of the hourly CO2 mass emissions in the quarter. The year-to-date cumulative CO2 mass emissions (tons) for each low mass emissions unit shall be the sum of all of the quarterly CO2 mass emissions, for all of the calendar quarters in the year to date.
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