The paper discusses EPA research on dry sorbent injection, which began in the late 1960s and early 1970s, and which will be demonstrated as the limestone injection multistage burner (LIMB) process at Ohio Edison's Edgewater plant in 1987. The effect and interrelationship of fundamental sorbent properties are now fairly well understood. These considerations, along with pilot-scale furnace testing, suggest that commercial calcium hydroxide will be the sorbent of choice for the demonstration. Ongoing research at EPA is focused on the modification of commercial sorbents to make them more reactive with SO2. The effects of sorbent injection on boiler efficiency, particulate collection, and solid waste handling and disposal have been studied, and negative effects can apparently be remedied by available techniques.