Code of Maine Rules › 06 - DEPARTMENT OF ENVIRONMENTAL PROTECTION › 096 - DEPARTMENT OF ENVIRONMENTAL PROTECTION - GENERAL › Chapter 169 - STATIONARY GENERATORS › Section 096-169-4 - Emission Standards

Current through 2024-29, July 17, 2024
Stationary generators subject to regulation under this
				  Chapter shall meet the following emissions standards:
A.
Non-Emergency Generators.
A
				non-emergency generator shall be powered by an engine that meets, at a minimum,
				the emission standards contained in 40 C.F.R. Part 60 , Subpart IIII as amended
				on June 29, 2021, 40 C.F.R. Part 60 , Subpart JJJJ as amended on June 29, 2021,
				or 40 C.F.R. Part 63 , Subpart ZZZZ as amended on December 4, 2020, as
				applicable.
B.
Emergency
				Generators.
(1) An engine with rated
				output of less than 1,000 brake horsepower (747 kilowatts) used to power an
				emergency generator must meet, at a minimum, the applicable emission standards
				and compliance methods contained in 40 C.F.R. Part 60 , Subpart IIII as amended
				on June 29, 2021, 40 C.F.R. Part 60 , Subpart JJJJ as amended on June 29, 2021,
				or 40 C.F.R. Part 63 , Subpart ZZZZ as amended on December 4, 2020.
(2) An engine with rated output equal to or
				greater than 1,000 brake horsepower (747 kilowatts) used to power an emergency
				generator must comply with one of the following:
a. If the unit is a compression ignition
				engine, it must meet, at a minimum, the emission standards and compliance
				methods in 40 C.F.R. Part 60 , Subpart IIII (as amended on June 29, 2021) for
				new non-emergency engines of the same size;
b. If the unit is a spark ignition engine, it
				must meet, at a minimum, the emission standards and compliance methods in 40
				C.F.R. Part 60 , Subpart JJJJ (as amended June 29, 2021) for new non-emergency
				engines of the same size;
c. The
				engine must be limited by a license condition to a total usage (emergency and
				non-emergency use combined) of 500 hours per year on a 12-month rolling total
				basis. If there are periods of extended outage such as a natural disaster or
				other similar event outside the control of the owner or operator, the owner or
				operator may apply to the Commissioner of the Department of Environmental
				Protection for a temporary variance to exempt specific time periods from this
				annual hour limit. The Commissioner may, without hearing, issue that variance
				for a period of time not to exceed 30 days if, in his/her judgement, the
				variance is necessary to avoid immediate threat to public health, safety, or
				general welfare or to protect critical infrastructure;
d. Results of a qualitative ambient impact
				screening analysis must demonstrate to the Department's satisfaction that
				emissions from the engine(s) will not cause or contribute to violations of
				ambient air quality standards including, but not limited to, ambient increments
				as adopted by the Department pursuant to 38 M.R.S. § 584 . The analysis
				may consider factors including, but not limited to, emission rates, stack
				height and location, height and configuration of nearby structures, proximity
				of sensitive receptors (e.g., schools, nursing homes, normally occupied
				building air intakes), terrain features, and operational limits. Agreement with
				the conclusions of such analysis and its sufficiency to assure protection of
				standards is solely at the discretion of the Department; or e. Results of an
				ambient air quality dispersion modeling analysis as approved by the Department
				must demonstrate that emissions from the engine, either alone or in conjunction
				with existing emissions from other sources, will not cause or contribute to
				violations of ambient air quality standards including, but not limited to,
				ambient increments as adopted by the Department pursuant to 38 M.R.S. §
				584 .
Note: In some instances, federal emission standards may be
				  more stringent than the requirements of this rule. In all cases, the more
				  stringent standard shall apply.