PNNL 13277

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PNNL 13277 ( pnnl-13277 )

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under local code jurisdiction. Currently, no technology-specific code structure exists for the installation and base load operation of microturbines by private nonutility parties in commercial or residential buildings. In such cases when a technology is not specifically referenced in the applicable code documents, code officials may disallow the installation and operation of that unit. Building officials may require specific tests to demonstrate “alternative compliance”; performing the necessary site-specific studies-- possibly requiring modifications to the installation--can increase the installed cost of a unit beyond any reasonable expectation for return on investment. Further, with 44,000 state and local code jurisdictions in the United States, the absence of any reference in the national code bodies may kill altogether the early prospects for the mass deployment of a new energy technology such as microturbines. This report reviews the codes and standards applicable to the safe installation and operation of microturbines in commercial and residential buildings. It provides an overview of potential regulatory roadblocks, as well as recommendations for further action that may be undertaken by the U.S. microturbine community. This report does not attempt to provide a technical review of any manufacturer’s product, nor does it involve any technology-specific analysis (i.e., comparing the output current grounding design of one manufacturer, against UL 2200 requirements for Stationary Engine Generator Assemblies). This study did not find that additional standards are required for building code officials to accept microturbine installations when external to a commercial or industrial facility. However, a general lack of education among code officials on the differences between DER installations and traditional backup generators, is in fact hampering the deployment of microturbines. A general education program for building code officials is in order. The report closes with the recommendation to pursue a performance standard specifically for microturbines, and for those applications most relevant to the emerging DG market--combined heat & power, premium power quality. iv

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