Biffa has submitted planning application for design changes at an energy-from-waste facility at Newhurst, Leicestershire.
The proposed changes relate to the internal process lines, and would result in a 57% increase in power output to 33MW from a corresponding increase of 17% in feedstock.
Under the current planning permission the facility is designed to handle up to 300,000 tonnes of waste per year.
Biffa also wants to replace the two process lines with a single one, which would mean that only one flue-gas stack would be needed.
Other design changes include the addition of several cooling fans and minor changes to the internal road layout.
The company will now submit a new planning application to Leicestershire Council to amend the approved scheme.
Biffa obtained planning permission for the facility in 2012 when Secretary of State for Communities and Local Government Eric Pickles backed its appeal after Leicestershire Council turned down the application twice.