Section 096-148-5 - Emission StandardsA generator's emissions of nitrogen oxides (NOx), particulate matter (PM) and carbon monoxide (CO) under full load design conditions or at the load conditions specified by the applicable testing methods shall not exceed the following standards. Standards are expressed in pounds per megawatt-hour (lbs/MWh) of electricity output.
A. Emergency generators. A generator may run up to a maximum of 500 hours per year for maintenance, testing and emergencies. Within that limit of 500 hours per year, a generator may run up to a maximum of 50 hours per year for maintenance and testing. Emergency generators must meet the emission standards set by the EPA for non-road engines ( 40 CFR Part 89 Control of Emissions of Air Pollution from Nonroad Diesel Engines as published in the Federal Register, Vol. 69, No. 124, pages 38957-39273 on June 29, 2004 or 40 CFR Part 90 Control of Emissions from Nonroad Large Spark-Ignition Engines, and Recreational Engines (Marine and Land-Based) as published in the Federal Register, Vol. 67, No. 217, pages 68241-68447 on November 8, 2002) at the time of installation. Any engine that is certified pursuant to 40 CFR Parts 89 or 90 shall be automatically certified to operate as an emergency generator.B.Emission standards for non-emergency generators are as follows: Emission Standards for Non-Emergency Generators
| Nitrogen Oxides | Particulate Matter | Carbon Monoxide |
| Installed on or after January 1, 2005 | 4.0 lbs/MWh | 0.7 lbs/MWh | 10.0 lbs/MWh |
| Installed on or after January 1, 2009 | 1.5 lbs/MWh | 0.07 lbs/MWh | 2.0 lbs/MWh |
| Installed on or after January 1, 2013 | reserved | reserved | reserved |
C.Generators that use combined heat and power (CHP) may take credit for the heat recovered from the exhaust of the combustion unit to meet the emission standards in Subsection 5B of this Chapter. Credit shall be at the rate of one MWh for each 3.4 million BTUs of heat recovered. To take credit for CHP, the owner or operator of units not sold and certified as an integrated package by the manufacturer: 1 Must provide as part of the application documentation of the heat recovered, electric output, efficiency of the generator alone, efficiency of the generator including CHP, and the use for the non-electric output; and2 The heat recovered must equal at least 20 percent of the total energy output of the CHP unit and at least 13 percent of the total energy output must be electric. The design efficiency must be at least 55 percent.D.Alternative emission limitation. Generators subject to this Section may apply for an alternative emission limitation on a case-by-case basis upon approval from the Department and EPA.E.The particulate matter standards of this Section shall apply only to a generator with a reciprocating engine using liquid fuel.06- 096 C.M.R. ch. 148, § 5