The Calstock Project is a biomass generation facility that also utilizes waste heat to produce electricity. It is located on the north side of Highway 11 on lots 26, 27, and 28, Concession 4, in the Township of Stoddart, in the District of Cochrane, Ontario. It is located approximately 30 km west of Hearst, Ontario. The site on which the Facility is located, is 31 hectares, with the developed area of the site accounting for approximately 23 hectares. Atlantic Power indirectly owns 100% of the facility. Calstock sells 100% of its output to the Ontario Electricity Financial Corporation (OEFC) under a power purchase agreement that expires in 2020.
The Facility creates steam from the combustion of wood waste in a boiler and waste heat from TransCanada's nearby compressor station. Power is generated using one 41 megawatt (MW) Alstom steam turbine-driven generator. The wood waste is burned in a Foster Wheeler boiler with the flue gases from the boiler treated in a cyclone separator and an electrostatic precipitator that removes the majority of the unburned carbon and particulates before the gases enter the atmosphere. The Facility uses a cooling tower to condense process steam for reuse in the power generation cycle. Calstock has a maximum processing capacity of 320,000 GMT/yr of wood waste. The power plant occupies 1.9 hectares of the Calstock site.
Residual wood ash from the Facility is disposed of in a dedicated ash landfill comprised of 4 separate cells and is located on the eastern portion of the property. Cells 1 and 2 have been filled and closed in accordance with the requirements of the existing Certificate of Approval (C of A). Cell 3 was constructed in the fall of 2006 and is currently operational. Cell 4 was built in 2013 and is expected to be full in 2018.