Utility-connected systems for residential and commercial buildings have also been installed throughout the world, although at present prices, they are not cost-effective when compared to nearby utility service. In the United States, New England Electric Systems installed 30 2.2-kW residential systems (silicon-cell modules) and three commercial systems in the town of Gardner, Massachusetts to study the impacts of a large number of PV systems on utility facilities [41]. The general conclusion is that there were no significant negative impacts on the utility’s equipment or operation [42]. This was based on the performance of the specific power conversion units installed in the systems.