The Connecticut Siting Council held a Dec. 15 hearing on the Aug. 17 application by NTE Connecticut LLC for approval of a 550-MW, combined-cycle project.
This evidentiary session was continuation of the hearings held on Oct. 20, Nov. 3 and Nov, 15. NTE Connecticut, is seeking a Certificate of Environmental Compatibility and Public Need for the construction, maintenance, and operation of a 550-MW, dual-fueled combined-cycle facility and associated electrical interconnection switchyard located on Lake Road in Killingly, Connecticut.
The Dec. 15 session featured questioning of company witnesses by the town of Killingly about water permitting and zoning issues. Said company witness Scott Hesketh at one point: “We are in the process now of preparing the construction documents. As indicated, we did provide some preliminary plans, general layouts to the town staff, which were deemed acceptable to move forward with. We’re now working on a detailed design to try to identify any impediments or obstacles we need to overcome. And then we’ll go back and meet with town staff, again, let them know what we found, and then proceed to the final design. We should be able to have that done within a couple of months. And if the town reviews and accepts the plans, we’d be ready to go to construction probably in the springtime, depending on whatever approvals are necessary and obtained from other agencies.”
NTE proposes with this project 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 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.
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.