EPA issues final air permit for up-to-740-MW gas plant in Texas

The U.S. Environmental Protection Agency on Oct. 28 issued a final air permit for the gas-fired Lon C. Hill Power Station (LCHPS) in Nueces County, Texas, of Lon C. Hill LP.

The air permit was issued by EPA Region 6 under the greenhouse gas (GHG) part of the prevention of significant deterioration program. As is standard with a permit like this, the developer has 18 months from here to begin construction or the permit will lapse.

The LCHPS will generate approximately 625 MW to 740 MW of gross electrical power near the City of Corpus Christi. The LCHPS will consist of two natural gas-fired stationary combustion turbines (two combustion turbines, two heat recovery steam generators and one steam turbine) equipped with lean pre-mix low-NOx combustors; one diesel fuel-fired emergency electrical generator engine; and one diesel fuel-fired fire water pump engine.

The new facility will consist of either two new natural gas-fired Siemens SGT6-5000F CTG, General Electric 7FA.04 or equivalently rated turbines. The Siemens SGT6-5000, GE 7FA.04 or equivalently rated combustion turbines will have a maximum heat consumption of approximately 2,260 MMBtu/hr (HHV) each and a nominal capacity of up to 240 MW of power each.

Heat recovered in each HRSG will be utilized to produce steam. Steam generated within the HRSG will be utilized to drive a steam turbine and associated electrical generator. The HRSGs will be equipped with duct burners for supplemental steam production. The duct burners will be fired with natural gas. The maximum firing rate of each duct burner system will range from approximately 250 to 670 MMBtu/hr. The duct burners’ total annual firing will not exceed the equivalent of 4,375 hours. The exhaust gases from the unit, including emissions from the CTG and the duct burners, will exit through a stack to the atmosphere through one common dedicated stack.

“The two combustion turbines and one steam turbine will be coupled to electric generators to produce electricity for sale to the Electric Reliability Council of Texas (ERCOT) power grid,” said EPA. “Each combustion turbine model has an approximate maximum base-load electric power output up to an output of 240 MW. The steam turbine is expected to generate approximately 230 to 290 MW. The units may operate at reduced load to respond to changes in system power requirements and/or stability.” 

A project contact is: Lon C. Hill LP, 919 Milan St. Suite 2300 Houston, TX 77002,  Gary Clark, Asset Manager, (713) 358-9768.

About Barry Cassell 20414 Articles
Barry Cassell is Chief Analyst for GenerationHub covering coal and emission controls issues, projects and policy. He has covered the coal and power generation industry for more than 24 years, beginning in November 2011 at GenerationHub and prior to that as editor of SNL Energy’s Coal Report. He was formerly with Coal Outlook for 15 years as the publication’s editor and contributing writer, and prior to that he was editor of Coal & Synfuels Technology and associate editor of The Energy Report. He has a bachelor’s degree from Central Michigan University.