What is renewable gas (biomethane)?
Biomethane is a carbon-neutral renewable gas made from farm and food waste through a process known as anaerobic digestion.
Biogas is initially produced through the breakdown of organic material (feedstock) by micro-organisms in large oxygen-free tanks (anaerobic digesters) into biogas and digestate. This process also occurs naturally in nature as organic wastes and residues decompose releasing methane into the atmosphere. To be injected into the gas network, this biogas must then be upgraded to biomethane and meet the quality standards as required by Gas Networks Ireland.
Biomethane, began flowing into the gas network in 2019 and is the first step to a cleaner energy future. It can reduce emissions across key sectors of the economy including heating, industry, transport and power generation, while also supporting the decarbonisation of the agri-food sector.
This renewable energy is structurally identical to natural gas and can be used in exactly the same way through the existing infrastructure, boilers and appliances, meaning homeowners and businesses will be able to transition to this sustainable energy source and play their part in progressing Ireland towards a cleaner energy future, without changing a thing.
The Biomethane Energy Report
Gas Networks Ireland has published the Biomethane Energy Report, a comprehensive study detailing the key findings from a national Request for Information process targeting biomethane producers.
Find out moreConnecting biomethane producers
Gas Networks Ireland has a pivotal role to play in supporting Ireland’s transition to a net zero energy system. One of our key roles is to provide connections onto the network for biomethane producers. We facilitate the injection of the renewable gas biomethane into the gas network via two methods. A direct connection where a pipeline extension will be constructed to connect a biomethane plant to the network. Where a pipeline is not viable, the second option is to transport the biomethane by truck to a central grid injection facility, where it will then be injected into the gas network.
Benefits of renewable gas
Benefits the agriculture industry
As well as reducing on-farm emissions and supporting more sustainable supply chains, an indigenous biomethane industry would also provide significant opportunities for local communities from the sale of biomethane, feedstock used to produce the renewable gas, and a bio-fertiliser that is a by-product of the process, and facilitate sustainable circular economies, with businesses powering their operations via renewable gas made from their own waste.
Biomethane producers handbook
This biomethane producers handbook is a comprehensive technical guide that provides detailed instructions and information on the production of biomethane. It includes detailed explanations on the different types of biomethane production processes, the various components and technologies that are used, and the safety and regulatory considerations for biomethane production. This handbook is an invaluable resource for those interested in understanding and producing biomethane.
Read moreRenewable gas in Ireland today
By gradually replacing natural gas with renewable gases, such as biomethane and hydrogen, Gas Networks Ireland aims to deliver a net-zero carbon gas network by 2050. Learn more about some of the key developments in the industry to date that will support reduce emissions across a number of key sectors, including those that are traditionally difficult to decarbonise, including heating, agriculture, industry, transport and power generation.
Central Grid Injection facility - Cush, County Kildare
Gas Networks Ireland successfully injected locally produced biomethane into the gas network for the first time at Ireland’s first purpose-built injection facility in Cush Co. Kildare. The dedicated renewable gas entry point in Cush commenced commercial flows in May 2020 and joined Corrib as the only indigenous gas source on Ireland’s network following the closure of the Kinsale Head gas field. Once flowing at maximum capacity, Cush will have the capability to supply renewable gas to approximately 11,000 homes.
Central grid injection facility - Mitchelstown, County Cork
Gas Networks Ireland is expected to begin construction of Ireland’s first large-scale renewable gas injection facility in Mitchelstown, Co. Cork next summer as part of the €30 million Green Renewable Agricultural Zero Emissions (GRAZE) renewable gas project.
The GRAZE project is led by Gas Networks Ireland and is supported by more than €8.4m in funding from the climate action fund, as part of the Government’s national energy security framework. The new facility will receive and inject carbon neutral renewable biomethane made from farm and food waste through a process call anaerobic digestion – from up to 20 local farm-based producers.
With planning approved and technical design underway, this CGI facility will take biomethane produced from facilities off-network and within a radius of up to 100 km. When operating at full capacity Mitchelstown will have the potential to inject enough renewable gas into the gas network to heat up to 64,000 homes.
Network Innovation Centre – Brownsbarn, County Dublin
A carbon free renewable gas that can be made from excess renewable electricity and stored until needed, hydrogen is vital to both Ireland’s and the EU’s ambition for a net-zero energy system by 2050.
Ireland’s gas network is considered one of the safest and most modern in the world. To ensure it is capable of safely transporting and storing hydrogen, Gas Networks Ireland has opened the Network Innovation Centre at its Citywest Campus at Brownsbarn, Co. Dublin, where pipelines, meters and appliances are being tested for use with a variety of gases and hydrogen blends. Currently it is understood that blends of up to 20% hydrogen are compatible with existing gas infrastructure. A rigorous testing programme will take place to confirm the level of hydrogen that Ireland’s gas network can facilitate.
Glossary
Biomethane
Biomethane is a carbon-neutral renewable gas. Biogas is initially produced from farm and food waste through a process known as anaerobic digestion where the greenhouse gases created by agricultural and food waste emissions are captured and converted into energy. To be injected into the gas network, this biogas can must be upgraded to biomethane and meet the quality standards as required by Gas Networks Ireland.
Feedstock
The material that is used in anaerobic digestion is called feedstock. This can include animal slurries and crop residues. What goes into a digester determines what comes out, so careful choice of feedstocks is essential. Securing a reliable feedstock supply is fundamental to profitable anaerobic digestion.
Digestate
Digestate is the material remaining after the anaerobic digestion of feedstock. Digestate can be applied as a bio-fertiliser to grass and tillage lands as a sustainable alternative to chemical fertiliser application, offsetting carbon emissions from conventional fertilisers.