Effingham County Power LLC is working on a major expansion of a gas-fired power plant in Effingham County, Ga., with the state Environmental Protection Division recently issuing an air permit change that covers the project.
The facility requested authorization to construct and operate an additional nominal net 668-MW combined cycle power generation facility, the EPD noted in a permit approval document from May 30. The project will consist of two combustion turbines (CTs) and associated heat recovery steam generators (HRSGs) including duct burners, one steam turbine, one fuel heater, one auxiliary boiler, one 10-cell mechanical draft cooling tower, one 6-cell mechanical draft cooling tower and one fuel oil storage tank. The combustion turbines will be capable of accommodating natural gas and ultra low sulfur distillate fuel oil. The duct burners, fuel heater, and auxiliary boiler will be capable of accommodating natural gas only.
Two nominal 180-MW GE Model 7FA combustion turbines (CTs) will be operated in combined cycle mode fired primarily by natural gas with ultra low sulfur diesel fuel as backup fuel. The combustion turbines would be equipped with dry low-NOx (DLN) combustor technology for natural gas combustion and water injection for fuel oil combustion.
The two heat recovery steam generators (HRSGs) would each be equipped with a natural gas fired duct burner. The combined CT/HRSG stack would be equipped with selective catalytic reduction (SCR) and catalytic oxidation for control of NOx and carbon monoxide emissions, respectively. There would be one 325-MW steam turbine generator. There would be one natural gas-fired auxiliary boiler that will be equipped with low-NOx burners (LNBs) to control NOx emissions. The one natural gas-fired fuel gas heater will be equipped with LNBs to control NOx emissions.
Filings that ArcLight Capital Partners LLC has made with FERC show that Effingham is an ArcLight affiliate. In a Jan. 31 filing with FERC, Effingham told FERC that all of its sales of electric energy were made at wholesale and that it did not sell power to any purchaser for purposes other than for resale for the 2009, 2010 and 2011 reporting periods.
“Effingham County Power, LLC (Effingham) is an [exempt wholesale generator] under [the Public Utility Holding Company Act] that leases and operates a 463.4 MW (summer capacity rating) combined cycle, natural gas-fired generating facility in Effingham County, Georgia,” ArcLight Energy Marketing LLC (AEM) said in a December 2011 filing at FERC.
The commission has authorized Effingham to sell power at market rates. The full output of the Effingham facility is subject to a long-term tolling agreement with Constellation Energy Commodities Group, Inc. through December 31, 2015, under which Constellation has exclusive rights to the facility’s capacity and first-call rights to schedule and utilize energy associated with that capacity.
AEM operates as a marketer of electric power and natural gas, and FERC has authorized AEM to sell energy, capacity and ancillary services at market-based rates.