SEAI – Sustainable Enery Authority Ireland


SEAI study shows that renewable gas has the potential to replace more than one quarter of our fossil fuel gas supply

Media release
12th June 2017

New study by SEAI shows gas from animal manure, food waste and grass could provide 28% of Ireland’s gas needs
Renewable gas could cut carbon emissions by as much as 2million tonnes a year, the equivalent of the annual energy used in 360,000 households
Expanding the sector could lead to 3,000 permanent jobs.

Gas derived from renewable sources, such as food waste, unglamorous animal manure and grass, has the potential to replace more than one quarter (28%) of gas supply by 2050 according to a new study by the Sustainable Energy Authority of Ireland (SEAI). The study, which looks at the availability of renewable gas sources and estimates the costs and benefits of expanding the sector, shows that using renewable gas could also reduce carbon emissions by as much as 2million tonnes a year and create 3,000 permanent jobs.

Commenting on the study Jim Gannon, CEO of SEAI said: “Renewable gas has an important role to play in Ireland’s energy future. Ireland’s aim is to reduce carbon emissions by 80% by 2050. Everyday materials and by-products can be used to create valuable energy sources, and technologies are being developed to increase the potential of renewable gas even more. If further action is taken now to develop this sector then we can derive significant benefits from it in the future.” Gannon continued: “This means we will use less fossil fuel, including natural gas. Renewable gas can help with the decarbonisation of the gas network and could play an important role in Ireland achieving its overall targets.”

Renewable gas is most commonly produced from a process known as Anaerobic Digestion (AD) which turns material like food waste, grass and animal waste into biogas. Biogas can be burnt directly to produce heat and electricity or can be upgraded to a standard suitable for injection into the natural gas grid. The upgraded gas is often referred to as biomethane and is a direct substitute for fossil fuel gas supply. Biogas and biomethane can also be used as a fuel to power adapted trucks, buses and cars. Currently there are only a small number of AD plants in Ireland and an estimated 900 plants, of varying scales could be needed to fully utilise the available resources we have to hand.

A number of government bodies and departments in the areas of agriculture, transport, and environment and energy have a role to play in helping to lower the cost of renewable gas and to maximise the carbon savings available. Actions could include maximising the use of our food and animal waste and increasing biomethane production to inject renewable gas at accessible points on the gas grid. Significant potential exists to utilise surplus grass silage produced on farms, which represents 86% of the renewable gas potential. Grass silage has a production cost that makes the energy produced more expensive. Farming practices that balance cost and emissions will help to improve the overall benefits as we access this resource.

The study was overseen by a steering group comprised of representatives from a range of relevant Government Departments, regulatory bodies and academic experts.


For further information contact:
Johnny Fallon, Carr Communications: 085 889 5103 or



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Colorado Town Is First In The US To Switch To Renewable Natural Gas

The city plans to use the gas to run about 40 vehicles in its fleet. As long as humans are around, the fuel source won’t be depleted.
By Ethan Weston | January 16, 2016

The city of Grand Junction, Colorado, is turning its raw human waste into a type of renewable natural gas called biomethane. It’s the first city in the United States to do this — not surprising.

The gas is produced as organic matter and breaks down into raw biogas. It’s then refined and can be used in any system compatible with natural gas.

The city plans to use the gas to run about 40 vehicles in its fleet.

The thing about human waste is it’s always going to be available, which makes converting it into a usable form a pretty smart move. And the gas produced is better for the environment.

Renewable natural gas that’s burned as fuel becomes 21 times less potent than if the methane had been released directly into the air.

A utility engineer for Grand Junction told The Guardian that the city “may be reducing greenhouse gases by as much as 60% to 80%.”

And biomethane doesn’t just come from human waste. It can also be captured from landfills and livestock waste: two of the top producers of methane in the United States.

As for the cost, a manager at the treatment plant told NPR the savings could be in the “hundreds of thousands of dollars.” And the city expects the project to pay for itself in about seven to nine years.

The National Association of Clean Water Agencies found that energy produced by wastewater treatment plants could meet up to 12 percent of the national electricity needs alone. So maybe Grand Junction is just ahead of the curve. (Video via Doug Von Gausig)

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