[6] LO-NOx burners were installed in both boilers in 2001 to curtail nitrogen oxide (NOx) emissions.

[6] NOx emissions were reduced again in 2008 with selective non-catalytic reduction (SNCR) systems being retrofitted by Fluor to Big Brown's units.

[9] This was to fulfill the United States Environmental Protection Agency's (EPA) Cross-State Air Pollution Rule to reduce its sulfur dioxide (SO2) emissions.

[11] It was announced on October 13, 2017 that Luminant was to either shut down or sell to another concern Big Brown in early-2018 due to economic factors such as low natural gas prices and growth in renewable energy.

[12] The following month, Electric Reliability Council of Texas (ERCOT) approved of the shut down.