Covanta the operator of Dublin's Poolbeg incinerator has announced that the plant is now fully operational after passing performance tests.
The company says that emissions are 96% below the limits set out in its licence.
In a statement the company announced that the waste to energy facility is now processing 1,800 tonnes of waste a day.
This follows a testing and commissioning process from May to October and an independent performance evaluation.
Last June, the release of a cloud of lime led to 11 employees being taken to hospital.
And the plant is facing six counts before the district court of breaking conditions of the licence granted by the Environmental Protection Agency.
However, general manager of the plant, John Daly, said the recent test results are extremely gratifying.
The company says the plant will divert refuse from landfills and enable the eastern region to become self-sufficient in managing waste.