Greenfield South Power Corp. is proposing the construction, operation and eventual decommissioning of a new combined cycle, 300-MW (net) natural gas-fired plant in St. Clair Township, Ontario, at one of two sites.
After evaluating both candidate sites, the company will select which one it wishes to proceed with on the basis of the most favorable potential, said the Canadian Environmental Assessment Agency in a Dec. 3 announcement. The facility’s main components would include a gas turbine, heat recovery boiler, steam turbine, cooling tower and an electrical substation. It’s called the Green Electron Natural Gas Power Generation Project.
Natural gas will be provided from one of the existing nearby pipelines and the electricity produced by the facility will be fed into a nearby 230,000 Volt electrical transmission circuit of Hydro One Networks Inc.
“The project is part of Ontario’s plan to replace all of its coal fired electricity generation with new, clean natural gas fueled generation so as to improve air quality and hence improve the health of its citizens,” said a project summary. That is a reference to plans by Ontario Power Generation, under a provincial government mandate, to phase out all of its coal-fired generation by the end of 2014.
Written comments on this proposed project and whether an environmental assessment will be needed to cover it must be submitted to the agency by Dec. 23.
“Under the contract with the Ontario Power Authority, the power plant will likely operate about 25% of the year, during times of higher electricity demand which occur typically between morning and evening on summer and winter business days, but this may vary depending on variations in the spot market prices for electricity and natural gas,” said the project summary.
The power plant will utilize one GE 7FA gas turbine generator set fueled by natural gas. The gas turbine will be equipped with dry low NOx burner technology which has been selected to reduce emissions of NOx. With dry low NOx burner technology, the use of selective catalytic reduction (SCR) technology is not required or recommended, the summary noted. The power plant design is based on the use of a water-tube, heat recovery steam generator (HRSG) equipped with a supplementary natural gas duct burner. The power plant will utilize one Fuji steam turbine generator set. The unit is “packaged” with all accessories so as to reduce site installation time, the summary added.
The electricity will be generated at about 18,000 Volts by the gas turbine generator and at 13,800 Volts by the steam turbine generator. This power will flow through separate generator step up transformers to both feed the power plant’s internal loads and to be exported to the Hydro One transmission system at 230,000 Volts via the facility’s high voltage switchyard.
Preparation of the site and construction will occur once all necessary permits are issued, which is expected by spring 2013. Construction is expected to take about 21 months. Commissioning will then take about three months.