Constellation Energy recently completed a series of air quality upgrades on both units at its Brandon Shores Generating Station that included flue gas desulfurization (FGD), baghouse, SO(3) control, and mercury reduction by activated carbon injection. The plant's unique arrangement required long duct runs to the air quality system and a mile-long conveyor for moving barge-delivered limestone to the plant. Treated municipal wastewater was used as wet FGD supply water, and effluent treatment included first-of-its-kind nitrogen removal before discharge to the Chesapeake Bay watershed.