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New EPA Requirements - What to Expect
The next significant code change affects diesel engine emission levels and will occur in 2011. This code change will bring up the plus 500 kilowatt electrical (kWe) generators to Tier 3 requirements. The EPA does not currently require post treatment technologies for stationary diesel standby generators (these include particulate traps and selective catalytic reduction). Post-treatment technology will be required for all applications that are being operated in non-standby applications.
Generac will continue to supply EPA-certified stationary diesel standby generators. This category is and should remain exempt from the need to apply after-treatments, as would normally apply to non-road diesel engines. Generac's line of stationary emergency generators is exempt from the full requirements of the mobile non-road diesel regulations. These regulations mandate that after-treatment is required due to the intended use of this type of generator, which includes infrequent run-time.
EPA requirements issued in 2008 for spark-ignited engine emissions (natural gas or LP, emergency or non-emergency) required that either the manufacturer obtain emission certification or the engine must be subjected to an expensive on-site testing and certification process. To control emissions, generating sets producing more than 80 kilowatts (kW) of electrical output require an active air-fuel ratio control combined with an exhaust catalyst, much like an automobile.
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