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A significant amount of green power is being installed at the distribution level through the installation of green power generation facilities in the United States and Canada. This paper discusses green power generating sources (of 10 MW or less), which are connected to the utility system at the distribution level, and their impact on the distribution system. The paper also discusses the impact of smart grid and whether this new technology can solve some of the issues raised in this paper. Distribution circuits are designed to supply generation could mean: redistribution of fault and load currents on the feeder circuit, overvoltage and ferroresonance, plus a possible loss of protection system coordination-all of which can result in customer outages. The paper discusses these issues which are generally not well understood by many distribution protection engineers and can adversely affect distribution system reliability.