The Environmental Protection Agency has given the go-ahead for Shell to operate its gas refinery and combustion plant at Bellanaboy, Co Mayo.
The Agency has decided to grant a licence for the processing of 9.9m cubic metres of natural gas per day at the plant.
Shell submitted its initial application to the EPA nearly three years ago. After the Agency requested further information - the final submission came in October 2006.
In January of this year, the EPA announced its preliminary decision was to grant a licence to the facility and, following consultation and an oral hearing in April it has decided to re-affirm that position subject to 90 conditions.
By ways of reassurance, the EPA said its Office of Environmental Enforcement will monitor and enforce these conditions through environmental audits, unannounced site visits and systematic checks.
The EPA said it was satisfied that emissions from the licensed refinery will not adversely affect human health or the environment and will meet all relevant national and EU standards.