Two Scottish councils are seeking a contractor to design, build, finance and operate shared facilities to treat 110,000 tonnes of residual waste per year.
City of Edinburgh and Midlothian Councils has given companies until midday on 13 February 2012 to register their interest in the contract.
The local authorities have obtained planning permission in principle for a mechanical biological treatment plant and an energy-from-waste plant at Millerhill in Midlothian.
It is expected that the contract will be awarded by 2014 and that the facilities will be operational in 2017.
Scotland’s Zero Waste Plan bans the sending of biodegradable waste to landill from 2020.
Councillor Russell Imrie, cabinet member for strategic services at Midlothian Council, said: “By continuing to bury valuable wastes in landfill sites we are not only exposing the partner councils to ever increasing disposal costs but depleting our finite supply of raw materials and allowing landfill gas emissions to add to global warming.”