Calaveras Power Station

J.T. Deely Power Plant was a two unit, 871 megawatt (MW) coal power plant located at the Calaveras Power Station. They were operated by CPS Energy and ran from 1977 to 2018.

O.W. Sommers is a two unit natural gas power plant with a combined capacity of 892 MW.[1] Unit 1 began commercial generation in 1972 and Unit 2 began in 1974.[2][3] The plant is named after former CPS General Manager, Otto W. Sommers.[4]

J.K. Spruce is a two unit coal power plant with a combined capacity of 1,300 MW.[5] Construction of Unit 1 was completed in 1992.[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 (NO_x) 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.[5] The second unit constructed included modern pollution controls such as the installation of a SCR system and flue-gas desulfurization (FGD) system which removed NO_x and sulfur dioxide (SO₂) respectively.[5] According to a report by Synapse Energy Economics, Spruce operated at an estimated loss of $135 million from 2015 to 2016 as depressed natural gas prices made coal uneconomical to operate.[8] Moody's revealed in a 2018 report that a generator issue at Spruce's Unit 2 has made the unit run at less than half its capacity thereby raising the plant's expenses.[9] In January 2023, CPS Energy's board of trustees voted to shut down Unit 1 and convert Unit 2 to natural gas by 2028, thereby ending the use of coal-fired power generation to power San Antonio's power grid.[10]

• List of power stations in Texas