Electrostatic precipitators (EP) in coal-fired power plants are usually installed either between economizers and air heaters (higher temperature EP), or between air heaters and gas/gas heaters at the heat recovery side (lower temperature EP). In order to resolve a back corona phenomenon (one of the factors undermining the performance of EP) and to improve the performance of EP, there has been a proposal recently for installing EP in the downstream part of GGH (the heat recovery side) , a system called “low lower temperature EP.” In order to accommodate this system, SHI has established basic technology for low lower temperature EP based on the results of fundamental studies and conducted a series of performance tests at Takehara Thermal Power Plant of Electric Power Development Co., Ltd. The first unit adopting this system was delivered to Tachibana-wan Thermal Power Plant (for the No.2 generator) of Electric Power Development Co., Ltd, a plant that boasts the largest output (1,050MW) in Japan. This unit started commercial operations in December 2000.