Work is due to start next week on Wales' first energy-from-waste (EfW) combined heat and power facility.
The facility is to be built at Trident Park in Cardiff by Viridor, in partnership with a joint venture consisting of EfW engineering specialists CNIM and construction firm Lagan.
It is anticipated that the project will be finished by 2014 and it will bring an estimated £185 million of investment and employment opportunities to the city.
Once operational, the plant will treat 350,000 tonnes of residual (post-recycling) waste, generating 30 megawatts of electrical power for around 50,000 homes and providing a potential heat source to local businesses and other organisations.
Commenting on the development, Howard Ellard, Viridor's business development director, said: "We are pleased to be taking this important project to the construction phase.
"By 2014 Trident Park EfW will help local authorities and businesses to transform their residual waste into much-needed renewable energy."
It was recently announced that a similar £300 million facility is to be built in west Yorkshire at SSE's Ferrybridge power station.
The multi-fuel generation facility is going to be developed in a joint venture between SSE and Wheelabrator Technologies called Multi-Fuel Energy.