Abstract: An exhaust control damper system for a power plant includes a frame configured to be fluidly coupled in an exhaust flow path from a gas turbine (GT) system to a heat recovery system. The damper system includes at least two sets of louvered dampers in the frame and collectively covering the exhaust flow path. Each set of louvered dampers includes a plurality of blades collectively angularly positionable in one of: a fully open position, a fully closed position, and a partially open position. An air insertion system is coupled to the frame and configured to insert an airflow into the exhaust flow path to control the exhaust temperature entering the heat recovery system. The sets of louvered dampers can be modulated independently to control exhaust flow distribution and mass flow to the heat recovery system.