The Cornwall Energy Recovery Centre was to manage residual household waste in the county and generate enough electricity to power 21,000 homes.
Sita UK project director David Buckle said: Although Cornwall is recycling more waste than ever, it is anticipated that there will still be more than 200,000 tonnes of residual household waste, and at least the same tonnage of commercial and waste, to dispose of each year.
There is an urgent need for this facility to avoid a waste management crisis and to provide a modern waste management solution for the whole county in which we produce energy from non-recycled waste, rather than landfill it.
Cornwall Council refused planning permission for the plant in March but Sita believes that the CERC is still the best solution for Cornwall.
The planning decision will be made by the Governments Planning Inspectorate through a public inquiry. It is hoped the inquiry will take place in early 2010.