Doswell nears permit for two additional gas turbines at Virginia power plant

The Virginia Department of Environmental Quality is taking comment until Sept. 13 on a draft Prevention of Significant Deterioration Permit that would allow Doswell Limited Partnership to add two combustion turbines at the existing Doswell Energy Center in Ashland, Va.

Doswell Limited Partnership has applied for a permit to add two General Electric 7FA.03 simple cycle combustion turbines, each rated at 170 MW (called CT-2 and CT-3).

The Doswell Energy Center (DEC) is currently composed of four Kraftwerk Union/Siemens (Model: V84.2) combined cycle turbine units each equipped with a duct burner and supporting equipment (auxiliary boiler, fire pump, emergency generator and fuel oil storage tanks) under one Prevention of Significance Deterioration (PSD) permit and one simple cycle turbine unit under another PSD permit. The combined cycle turbines were permitted in a PSD permit originally issued in 1990. The 190.5-MW simple cycle combustion turbine (CT-1) was added in a separate PSD permit in 2000. 

The company said it is moving CT-2 and CT-3 from an existing permitted site in Desoto, Florida. They are both GE Frame 7FA Combustion Turbines that are very similar in age and capability to the existing CT 1 (GE 7FA.03) at the Doswell Energy Center. The CT-2 and CT-3 maximum heat input assumed for natural gas firing is 1,961.0 MMBtu/hr (HHV).

On June 1, the Virginia State Corporation Commission approved a Doswell application for this project. The additional turbines would be capable of firing both natural gas and ultra-low sulfur diesel (ULSD) and would provide on-demand, peaking generation. Doswell told the commission it expects the project to begin commercial operation in March 2018.

Doswell said it will obtain natural gas from its existing firm and interruptible capacity, or purchase transportation service on an as-needed basis from Virginia Natural Gas under its existing tariff, or purchase from a third party. To supply gas to the new CTs, Doswell said it plans to construct a new natural gas supply line and a new pressure-regulating and dew-point heating station on the site. Doswell said that it will purchase ULSD from wholesale fuel suppliers in the Mid-Atlantic region. To store the ULSD, it plans to construct a dedicated ULSD storage tank on the DEC site or use one of its two existing approximately 7.5 million gallon storage tanks.

The project will interconnect at Virginia Electric and Power‘s existing Four Rivers Substation, located entirely on the DEC site. To interconnect the project with the substation, Doswell expects to construct a 0.3 mile interconnection line and associated facilities.

Doswell told the commission that it is 100% owned by affiliates of LS Power.

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.