Construction is to begin on Ireland's largest agri-based biomethane plant in Co Mayo.
The facility, which will be located near Ballinrobe, is the first commercial scale plant of its kind in the country.
A groundbreaking ceremony will take place at the site of the plant, which when operational, will process 90,000 tonnes of farm waste annually, including manures and slurries.
Nephin Energy, the developers of the facility, say it will generate over 85 gigawatt-hours (GWh) of sustainable, Irish-produced biomethane.
The company said the project will also create more than 100 direct and indirect jobs over its lifetime, along with "providing farmers with long-term, reliable income streams".
The Ballinrobe facility, which is set to come on stream in 2027, is among three state-of-the-art anaerobic digestion (AD) plants around the country being developed by Nephin.
The details of the two other facilities, which will also create direct and indirect jobs, will be announced later this year.
The plants will deliver over 250 GWh of biomethane annually, enough to heat over 38,000 homes, when they are all fully operational.
An agreement will also be signed today, under which Flogas will be the offtake partner for the renewable gas produced by the three plants.
'Significant boost for agri sector'
The Group Chief Executive of Nephin Energy, Tom O’Brien, said biomethane will play a central role in Ireland’s future energy mix, and he said the company is "proud to be driving growth in this sector".
"Partnering with Flogas, a recognised leader in sustainable energy, accelerates our development pipeline while unlocking the economic and environmental benefits that biomethane can deliver to rural communities across Ireland," he said.
The Managing Director of Flogas, John Rooney, said the deal is the largest domestic biomethane agreement of its kind to date in Ireland: "representing a significant boost for our agricultural sector and national net-zero progress."
"This investment aligns with national energy policy, and we progressed it against the background of having the Renewable Heating Obligation (RHO) in place, which we welcome."
Mr Rooney said the legislation "needs to be enacted without delay".
Minister for Climate, Environment and Energy Darragh O'Brien said the projects will deliver economic and environmental benefits for rural communities.
"This is more than just an agreement; it's a cornerstone deal that clearly demonstrates the immense growth potential within our green gas sector."
He added that projects like this are "vital for driving economic activity, creating rural jobs, and accelerating our transition away from fossil fuels".
Minister of State with responsibility for the Circular Economy, Alan Dillon, described the agreement as "a pivotal moment for Ireland’s energy landscape".
He said the strategic collaboration between Nephin Renewable Gas and Flogas "represents a significant leap forward for Ireland's green gas transition".
"This partnership, a first of its kind in Ireland, marks a major step in Ireland’s green gas transition, directly supporting the Government’s target to produce 5.7 Terawatt-hour (TWh) of biomethane by 2030."
