The report gives results of an evaluation of the impact of proposed acid rain legislation on the potential application of limestone injection multistage burner (LIMB) technology incorporating recent research and development findings. Several regulatory strategies and emission reduction targets were developed. For each regulatory strategy developed, the control technology mix of LIMB, flue gas desulfurization (FGD), and coal switching required to achieve the selected emission reduction level was determined. Next, the maximum number of boilers to which LIMB technology could be applied was determined by examining technical and regulatory constraints and emission reduction targets. The cost effectiveness of each regulatory case and control technology mix was estimated to evaluate the cost of each control technology mix. The study found that proposed acid rain legislation which mandates the retrofit of high efficiency control technologies such as FGD or which requires national SO2/NOx reduction levels greater than 10 million tons per year would significantly reduce the application of LIMB.