Do I re-test my diesel generator engine after 3 years, 5 years, or at all?

Yes there are a lot of confusing elements in the EPA regulations 40 CFR 63 Subpart ZZZZ, however the requirements for re-testing are pretty straight forward.

Here’s the Cliffs notes version:

Horsepower matters

  • Engines between 300 HP and 500 HP (200kW-375kW generators) do not require any additional testing – beyond the original EPA performance / compliance test done to confirm that the emissions retrofit equipment (diesel oxidation catalyst) was providing the required CO reduction.
  • Engines of 501 HP / 400kW and above require re-testing at 3 or 5 years, depending on annual non-emergency operating hours.

3 or 5 years?

  • Limited Use affected engines = used for less than 100 hours of non-emergency* operational hours – need to be re-tested every 5 years.
  • All other affected engines require re-testing every 3 years.

* The simple definition of Non-Emergency operation is anytime the engine generator is running, while the electrical utility is available. This includes regular exercising or load bank testing and utility control periods – really anytime that the utility could be providing power.

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