Tier 4 Emissions and Nonemergency Generators

A new white paper from Kohler explores how stationary nonemergency generators can meet the EPA’s Tier 4 emissions levels. The report explains the differences between systems that are compliant through aftertreatment devices, and those that are factory-certified. It also provides guidance on how organizations like data centers can select the best solution for their situation.

Used either as a primary or supplementary power source, stationary nonemergency diesel generators are often used in remote locations, to feed power back into the grid (and generating revenue for the operator), or for peak shaving. All stationary nonemergency generators in the US must meet or exceed the EPA’s Tier 4 emissions levels, which are outlined in the paper. It is expected that Canada will implement the same guidelines in 2021.

To ensure compliance, diesel engines on these generators can either be factory certified or they must use a third party aftertreatment device.

“Tier 4 certified versus compliant emissions solutions are not a matter of better or worse,” the report’s author states. “Rather it is about selecting the right solution for the application.” To help readers make that choice, the paper outlines three critical factors to be considered. Considerations include:

1. State and local regulations that are over and above EPA requirements.
2. Title V limits, which were implemented with the passage of the Clean Air Act.
3. The company’s goals around carbon footprint reductions, LEED certification, and other green initiatives.

Data centers, which often have several large standby generators, need to be particularly aware of Title V limits, according to Kohler.

Title V “requires sites emitting large amounts of pollution to gain permits, adhere to a testing schedule, and pay fees. Avoiding these limits is often sought by customers with a large installed base on a single site, such as a data center.” Kohler, Application of EPA Diesel Tier 4 Final Certified & Compliant Generators

To help readers make an informed decision, the report from Kohler provides solutions for a variety of scenarios. In addition to factory-certification, selective catalytic reduction (SCR) systems, particulate filters, and low-NOx engine calibration are discussed.

Engineers, contractors, and anyone responsible for a nonemergency generator will find this white paper a helpful resource to ensure Tier4 emissions compliance.

Download the full report, “Application of EPA Diesel Tier 4 Final Certified & Compliant Generators” from Kohler to further explore which generator and, if necessary, aftertreatment device is best for your situation.