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Grass-to-gas project selects Wärtsilä biogas upgrading

Grass-to-gas project selects Wärtsilä biogas upgrading
Wärtsilä Oyj will supply its Puregas CA50 biogas upgrading plant for an innovative grass-to-gas project in the UK (photo courtesy Wärtsilä).

Finland-headed marine- and energy engineering and technology major Wärtsilä Oyj has announced that it will supply its Puregas CA50 biogas upgrading plant for an innovative grass-to-gas project in the UK.

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The project is being headed by Ecotricity Group Ltd (Ecotricity), a UK energy company dedicated to fighting climate change by ending the use of fossil fuels. The order, the value of which has not been disclosed, was placed in April 2022.

When operational in 2023, this will be the first Green Gas Mill in the UK, making an important step toward creating a green economy.

Green Gas Mill roll-out planned

Green grass-to-gas is carbon neutral in that the carbon dioxide (CO2) it absorbs whilst growing is released back into the atmosphere when the biomethane is burned.

Fossil gas, by comparison, releases CO2 that is not in the atmosphere now, meaning that it is a net addition to atmospheric CO2.

Ecotricity plans to build many more Green Gas Mills in the future. The company calculates that 3 000 installations would provide enough gas to fuel all 22 million homes that are currently on the UK’s gas grid.

Replacing fossil fuels with grass-fed gas provides significant green energy benefits. Importantly, existing gas boilers installed in homes all around Britain can still be used, but in a much more sustainable way, commented Chris Ives of Paul Winter Consulting Ltd, the Consulting Engineer appointed by Ecotricity to manage this project.

Gas value chain supplier

The proven technology process works with grass that has been broken down in a silage container for approximately two months. It is then put into an anaerobic digester (AD) plant to produce biogas.

The Wärtsilä biogas upgrading plant refines the gas to grid standard biomethane aka renewable natural gas (RNG) prior to injection into the gas grid.

Wärtsilä has a strong track record in delivering highly efficient biogas upgrading solutions, and their Puregas system is a key element of this project, said Chris Ives.

Wärtsilä Gas Solutions is a market leader with innovative systems and lifecycle solutions for the gas value chain including handling of gas in seaborne transport – storage, fuel, transfer, and boil-off gas (BOG) management, gas to power, liquefaction and biogas solutions.

As a company committed to helping decarbonise the industries we serve, we are delighted to be involved in this exciting green energy project. In addition to its technological advantages, our Puregas CA50 biogas upgrading plant provides the customer with the lowest total cost of ownership, which is central to our product development, said Steven Scott, Sales Manager, Biogas Solutions, Wärtsilä Gas Solutions.

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