Existing Emergency Engine > 500 horsepower

An existing emergency engine that is greater than 500 horsepower and located at a major source of HAP is not subject to NSPS. If your engine does not operate or is not contractually obligated to be available for more than 15 hours for emergency demand response or during periods where there is a deviation of voltage or frequency of 5% or greater below standard voltage or frequency, this engine is not subject to the RICE NESHAP.

If your engine is contractually obligated to be available for more than 15 hours for emergency demand response or during periods where there is a deviation of voltage or frequency of 5% or greater below standard voltage or frequency, the engine must comply with 40 CFR 63.6604(b), 63.6605, 63.6640, and 63.6650(h).

Please review any State-specific emergency engine requirements that may apply to your engine.

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