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
• 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.