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In the United States some form of particulate control is used at power plants with a total generating capacity of more than 350.000 MWe. Approximately 330.000 MWe of this capacity is equipped with electrostatic precipitators (ESPs), and 20.000 MWe is equipped with bag-houses. Precipitators have been used for more than thirty years at utility plants, and fabric filters have been used at industrial plants for a comparable period of time and more recently at utility plants. consequently, both technologies are in a fairly mature stage of development. However, changing regulatory and economic environments require continuous improvement to both technologies to provide satisfactory performance. To meet this challenge, EPRI is actively supporting the development of innovative technologies to reduce the cost and improve the effectiveness of both precipitators and fabric filters. A summary of this work is presented in the following sections.