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EPA Finalizes Revisions to Internal Combustion Engine NESHAP/NSPS
Added 01-16-13

On January 14, 2013, EPA signed final revisions to the 2010 National Emission Standards for Hazardous Air Pollutants (NESHAP) for Reciprocating Internal Combustion Engines (RICE). EPA revised the New Source Performance Standards (NSPS) for stationary internal combustion engines (ICE) to specifying how the NSPS standard will apply to emergency engines used for demand. The final rule tightens emission control and other requirements beyond the proposed version.

In the final rule EPA specified that the NESHAP and NSPS standards will apply to a category of engines called emergency engines in the following way:

• Emergency engines may be used to prevent electrical outages and to test and maintain engines for up to a total of 100 hours per year.

• In 2015, emergency engines will be required to use cleaner fuel -- ultra low sulfur diesel (ULSD) -- if they operate, or commit to operate, for more than 15 hours annually as part of blackout and brownout prevention, also known as emergency demand response.

• Starting in 2015, entities with 100 horsepower (hp) or larger engines that operate, or commit to operate, for more than 15 hours and up to 100 hours per year for emergency demand response will need to collect and submit an annual report including location, dates and times of operation.

• For a combined total of 100 hours per year, emergency engines can be used for the following purposes: maintenance and testing, emergency demand response for Energy Emergency Alert Level 2 situations, responding to situations when there is at least a 5 percent or more change in voltage, and operating for up to 50 hours to head off otential voltage collapse, or line 4 overloads, that could result in local or regional power disruption.

• The rules restate that in an emergency, such as hurricane or ice storm, any engine of any size can operate without meeting control requirements or emission limits.

• Emergency engines that commit to run less than 15 hours for emergency demand response can operate without limits

The complete rule is posted at: http://www.epa.gov/ttn/oarpg/new.html.

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