Two potential Mitsubishi combustion turbine generator (CTG) models are under consideration for use at the proposed Middletown Energy Center, and both are evaluated in a June 4 application at the Ohio Power Siting Board by NTE Ohio LLC.
The outputs and characteristics of the Mitsubishi Power Systems M501JAC and M501GAC modes are both provided in the application.
The facility, located at Middletown, Ohio, will be permitted to operate as a nominal net 525-MW 1×1 natural gas-fired combined-cycle facility. The CTG is capable of generating a nominal 300 MW. The facility will also include a triple-pressure heat recovery steam generator (HRSG) with duct burners and a steam turbine generator (STG) capable of generating a nominal 225 MW.
The facility’s CTG will be permitted to operate solely on natural gas. “NTE has determined that, due to the high level of reliable natural gas delivery available to the Facility from two separate nearby interstate natural gas pipelines, a back-up fuel such as fuel oil is not required.,” the application added.
The proposed facility (which includes the power generating facility, switchyard, and other ancillary equipment) will be located on an approximately 45-acre property that is located entirely within the city of Middletown in Butler County. The facility site is generally bounded to the north and south by Oxford State Road and Enterprise Drive, respectively.
NTE said its market analysis identified this region of Ohio as one where the planned shutdown of existing coal-fired capacity and an increase in demand create the need for new, clean, efficient power generation. In 2013, NTE’s analysis of load growth, gas markets, future retirements of aging generation capacity, as well as the impact of regulations by the U.S. Environmental Protection Agency on coal generation, identified the state of Ohio and more specifically the southern Ohio region as the area of focus. By June 2012, over 6 GW of coal capacity in Ohio had been announced to be retired by 2015 by the plant owners.
The project development schedule is based on commencement of commercial operation in the second quarter of 2018 in order to meet the anticipated summer peak load demands within the PJM Interconnection marketplace. In order to meet this schedule, NTE is requesting issuance of the OPSB’s Certificate of Environmental Compatibility and Public Need to Construct an Electric Generation Facility by December 2014 to support commencement of construction in the second quarter of 2015.
Baseload project features cooling tower, two gas pipelines
The Middletown Energy Center will use a mechanical draft cooling tower which requires approximately 2.21 million gallons per day (mgd) of water. No new source of water will be developed on-site. Rather, NTE plans to contract with the city of Middletown to supply both potable and process water needs. The city has sufficient excess capacity in its water system to accommodate the facility without impact to other water users.
The facility heat rate will be 6,650 Btu/kWhr, higher heating value (HHV), unfired with inlet air evaporative cooling at 59 degrees Fahrenheit (°F). The facility will be permitted to operate up to 8,760 hours per year, although its actual hours of operation will be dependent upon energy needs in the region. Availability will be around 98%, however, it is anticipated that the annual capacity factor will vary between 70% and 80%.
The facility site is approximately 45 acres, of which approximately 11.5 acres will be required for the power generating facility and 2.9 additional acres for the adjacent Duke Energy interconnect switchyard. Natural gas will be supplied from the existing Texas Eastern and Rockies Express pipelines, owned by Spectra and Tallgrass, respectively. The anticipated peak fuel usage is approximately 4,000 million British thermal units per hour (MMBtu/hr) HHV. Each natural gas source will have a metering station on-site, to which each natural gas transportation provider will deliver natural gas to the facility. The natural gas interconnection and related components will be addressed in a separate OPSB filing.
The facility will interconnect with the existing Duke 345-kV transmission lines that cross the project site. PJM has assigned this project queue position Z1-079. The PJM Feasibility Study was completed in March 2014. The System Impact Study for the project was initiated in April 2014 and will be completed in September 2014.
NTE Ohio parent NTE Energy LLC is focused on developing, constructing, owning and operating power projects across the United States. NTE Energy is also actively developing gas-fired projects in Texas and North Carolina, as well as pursuing early-stage opportunities in several other locations. Through an agreement with Mitsubishi Hitachi Power Systems Americas Inc., NTE Energy is working to expedite development of projects that utilize Mitsubishi’s industry-leading advanced combustion-based generating technologies, the application noted.