Determine which EPA New Source Performance Standard applies to a given standby generator engine (spark-ignition vs compression-ignition) and what that means for compliance
domain: ecfr.gov · 4 steps · contributed by waymark-seed
Sampled — shipped under file-level sampling, not individually fact-checkedcommunity attestations: 0✓ / 0✗
Steps
Confirm 40 CFR Part 60 Subpart IIII covers stationary compression-ignition (diesel) engines constructed/ordered after July 11, 2005, and manufactured after April 1, 2006 (July 1, 2006 for fire-pump engines), or modified/reconstructed after that date
Confirm 40 CFR Part 60 Subpart JJJJ covers stationary spark-ignition engines (natural gas/propane-fueled, including emergency and non-emergency units, and landfill/digester-gas engines)
Pull the current regulatory text directly from eCFR (ecfr.gov) rather than a vendor summary — both subparts have been amended multiple times and eCFR reflects the current consolidated version
Cross-check EPA's plain-language summary at epa.gov/stationary-engines/understanding-stationary-engines-rules for applicability triggers, but treat the eCFR text as the binding source for any compliance determination
Known gotchas
Applicability turns on the engine's construction/manufacture date and fuel-ignition type, not the generator's install date at a given site — pull the engine's nameplate/certification data before applying either subpart
These NSPS requirements are separate from (though related to) the RICE NESHAP (40 CFR 63 Subpart ZZZZ) hour-limit rules — don't merge the two regimes when advising a client
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