These predominantly coal-fired plants have undergone years of environmental upgrades, including $410 million of new pollution control investments since 2001, to capture emissions. Vectren’s entire electric generation fleet is 100% scrubbed for sulfur dioxide, 90% controlled for nitrogen oxide and significantly controlled for mercury and particulate matter. See the timeline of investments below or click here to learn how these investments have improved local air quality.
1979 - Brown Unit 1 was constructed with a dual-alkali scrubber, which helps reduce sulfur dioxide emissions.
1986 - Brown Unit 2 was constructed with a dual-alkali scrubber.
1994 - Installed a flue gas desulfurization system (scrubber) shared by Culley Units 2 and 3.
2001-2005 - Installed four selective catalytic reduction (SCR) devices on the coal-fired units at both plants. The project has successfully cut nitrogen oxide emissions by 80%.
2004 - Replaced an existing electrostatic precipitator at Brown Unit 1 with a state-of-the-art fabric filter. The investment increased the particulate matter removal efficiency to 99% at this unit.
2006 - Installed a fabric filter at Culley Unit 3. The project further reduces PM emissions.
2009 - Completed construction of a flue gas desulfurization system (scrubber) at Warrick Unit 4. The project dramatically reduces sulfur dioxide emissions.
Take a look at the impact of our investments on nitrogen oxide (NOx) and sulfur dioxide (SO2) emissions over time. Click here or the image below to enlarge.