Have you been approached by your electric utility about entering into an interruptible rate structure? This could be a cost savings to your facility. However, if you plan to compensate for interruptions with your emergency generator, you need an air permit.
Peak shaving or interruptible power supply contracts strip a generator of its “emergency” status and negate air permit exemptions. Gen sets used for non-emergency electric generation are also subject to one of three federal emissions standards for internal combustion engines, depending on the type of engine.