MTU Onsite Energy CorporationUnderstanding the provisions of the current Tier 4i and future Tier 4 Final EPA standards is important for diesel power system specifiers and owners, especially in EPA nonattainment areas and non-emergency stationary power applications. The paper explains that for applications other than ESP, Tier 4 regulations for generator sets are being phased in two steps, beginning with Tier 4 I in 2011. Applications included are load management/peak-shaving, prime power, mobile rental power and spark-ignited engine generators used in non-ESP applications. Diesel generators used for emergency power in California and non-attainment areas throughout the U.S. are subject to the Tier 4 standards. The document also reviews the in-engine design changes and exhaust
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