[1][2] Deely was constructed as a coal plant due to the economics and unreliability for natural gas at the time.

[5] CPS Energy commissioned in 2009 the installation of a selective catalytic reduction (SCR) system to Unit 2 to replace an electrostatic precipitator (ESP).

[6] In 2011, it was announced that J. T. Deely would be shut down in 2018 due to pending federal regulations.

CPS Energy calculated that spending $3 billion to overhaul the plant to comply with environmental regulations outweighed the benefits.

[1] CPS Energy reiterated in 2017 that the plant would still close in 2018 even with the changes in environmental policy from the Trump administration.