Sommers is a two unit natural gas power plant with a combined capacity of 892 MW.

Spruce is a two unit coal power plant with a combined capacity of 1,300 MW.

[6] The plant is named after former CPS General Manager, Jack Spruce.

[7] A LO-NOx burner was installed to Unit 1 in 1999 to reduce nitrogen oxide (NOx) emissions.

[6] In order to meet future electricity demand, CPS Energy commissioned Unit 2 in 2005 and was completed in 2010 at a cost of $1 billion.