Texas agency nears permit decision on 232-MW Nacogdoches project

Nacogdoches Power LLC is nearing a decision from the Texas Commission on Environmental Quality (TCEQ) on issuance of a proposed Greenhouse Gas (GHG) Prevention of Significant Deterioration (PSD) Air Quality Permit that would authorize modification to the Nacogdoches Power Electric Generating Plant located at 499 County Road 988, Cushing, Nacogdoches County.

This application was submitted to the TCEQ on Nov. 26, 2014, said the commission in a Dec. 10 notice posted to its website on Dec. 14. The TCEQ executive director has determined that the emissions of air contaminants from the existing facility which are subject to PSD review will not violate any state or federal air quality regulations and will not have any significant adverse impact on soils, vegetation, or visibility. All air contaminants have been evaluated, and best available control technology will be used for the control of these contaminants. The executive director has completed the technical review of the application and prepared a draft permit.

Said the notice: “Nacogdoches Power LLC (NP) amended its non-greenhouse gas (GHG) permit to include the construction of a natural gas-fired simple cycle combustion turbine generator (CTG) within the property of the existing Nacogdoches Power Electric Generating Plant (NPEGP)…. The new CTG will be owned by Southern Power Company (SPC) and will be operated as a peaking unit. The CTG will be limited to 2,500 hours of operation per year.

“The NPEGP currently consists of a biomass bubbling fluidized bed (BFB) boiler and ancillary facilities. The BFB has a gross heat input of 1,374 million British thermal units per hour (MMBtu/hr) and is capable of producing approximately 100 megawatts (MW) of electricity. The permit currently covers the BFB boiler, fire water pump engine, emergency generator engine, cooling tower, fuel storage tanks, and all emissions resulting from the material handling. No changes are being made to this equipment with this permit action.”

The new unit at NPEGP will be a Siemens F5 natural gas fired combustion turbine in a simple cycle application, rated at a maximum output of 232 MW. The turbine will operate a maximum of 2,500 hours per year. CTG energy efficiency design, practices, and procedures, efficient CTG design, CTG inlet air cooling, periodic CTG burner maintenance and tuning, reduction in heat loss, i.e., insulation of the CTG, instrumentation and controls to achieve the numerical BACT limit of 1,316 lbs CO2/MWh.

A project contact is: Nacogdoches Power LLC, Ms. Kelli Mccullough, Environmental Engineer, (205) 257-6720.

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.