Connecticut council eyes decision by Feb. 13 on NTE’s 550-MW Killingly project

The Connecticut Siting Council on Oct. 19 issued a revised schedule for the review of an Aug. 17 application from NTE Connecticut LLC for approval of a 550-MW, dual-fuel combined cycle facility, with the schedule calling for a final decision by Feb. 13, 2017.

The schedule also includes a Nov. 3 evidentiary hearing in New Britain and the closing out of the record in this docket as of Jan. 17.

NTE is seeking a Certificate of Environmental Compatibility and Public Need for the construction, maintenance, and operation of a 550-MW, dual-fuel combined cycle facility and associated electrical interconnection switchyard located at 180 and 189 Lake Road, Killingly, Connecticut. The Killingly Energy Center (KEC) is designed to competitively serve the existing and future demand for electricity generation in Connecticut and throughout the New England regional transmission system.

The primary source of fuel for KEC will be natural gas, extending from existing service approximately two miles to the north of the KEC site. During times of natural gas curtailment or service interruption, KEC will operate on ultra-low sulfur distillate (ULSD) as a backup fuel.

NTE proposes to install one Siemens SGT6-8000H combustion turbine generator (CTG) that will produce approximately 300 MW (nominal). The CTG will incorporate NOX combustion control technologies, including dry-low NOX (DLN) combustors during natural gas firing and water injection during ULSD firing.

Waste heat in the CTG exhaust will be recovered to generate steam in a heat recovery steam generator (HRSG) to power the steam turbine generator (STG). The HRSG will be a multi-pressure, horizontal unit with reheat capabilities and natural circulation. The HRSG will be designed for horizontal gas turbine exhaust flow through vertical tube heat transfer sections, and will have supplemental fuel firing provided by an approximately 920 million British thermal units per hour (MMBtu/hr) natural gas-fired duct burner. The natural gas-fired duct burners will generate additional steam for the STG during periods of high electricity demand.

Selective catalytic reduction (SCR) technology, widely recognized as the most stringent available control technology for NOX emissions from combustion sources, will be installed to control NOx emissions. An oxidation catalyst will be installed to control carbon monoxide (CO) and volatile organic compound (VOC) emissions. The SCR and oxidation catalyst will be located within the HRSG downstream of the CTG and duct burners. Exhaust gases from the HRSG will be released to the atmosphere through a 150-foot tall stack.

The STG will be a 3,600 rpm, tandem compound, reheat steam turbine with a high pressure/intermediate pressure section and double flow low pressure section design. The STG will generate an additional approximately 250 MW of electric power at International Organization for Standardization (ISO) conditions with supplemental duct firing of the HRSG. The STG will be designed to run continuously, but will be capable of operating as a cycling unit to respond to fluctuations in electricity demand. The STG will be located in the turbine building with the CTG.

The CTG and STG are rated at a nominal 300 MW and 250 MW, respectively. The total of approximately 550 MW of generation will be integrated into the ISO New England electric grid via an electrical interconnection with the existing 345-kV transmission system.

NTE Connecticut is an affiliate of NTE Energy LLC, which is focused on the goal of developing, constructing, owning, and operating power projects across the United States.

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.