Biogas plant makes Gotland a climate-friendly island

A new biogas plant from Xergi A/S supplies 2.26 million m3 of biogas annually to industry and transport on Gotland. Expansion plans are already in the pipeline.

Biogas producer Brogas AB has set itself the goal of meeting all of the Swedish island of Gotland's demand for biogas.

It will do this by using the new, modular biogas plant from Xergi A/S which has now been operating successfully for a year.

The biogas plant ensures that dairy company Arla's local facilities have been able to replace a large part of their oil requirements with biogas. This has considerably reduced Arla's CO2 emissions – an important part of the company's objectives for 2020.

The biogas plant is simultaneously supplying gas to an upgrade plant that will provide Gotland's biogas-fuelled cars and busses with biogas. Every year the number of vehicles increases by 25 %.

"We want to make Gotland a self-sufficient island using renewable energy. In combination with electricity from wind turbines, Brogas is helping us achieve that goal," says farmer Magnus Ahlsten, who is a true biogas pioneer on the beautiful island in the middle of the Baltic Sea. He is one of 20 farmers who own Brogas AB in partnership with energy company Triventus.

Room for expansion

The new biogas plant, located just a few kilometres from the island's main town of Visby, digests animal manure, waste from abattoirs, and vegetable producers. The plan is gradually to increase production from 2.26 million m3 of gas annually up to 4 million.

"This makes it easy to expand the plant as we are planning to do. Arla, for example, is showing an interest in purchasing far more which tells us that the demand is there," says Project Manager Björn Palmgaard, who, on behalf of the investor Triventus, has worked closely with Xergi on the construction of the plant.

Xergi built the biogas plant in technical modules at a factory in Denmark, and then transported the modules to Gotland. This meant that contractors and workmen did not need to work outside in rough weather conditions on Gotland to build the plant. According to Xergi managing director Jørgen Ballermann, this is the decisive advantage of the company's modular concept.

"It reduces the risk of construction errors and also makes the project much cheaper to build. A large part of the plant was transported to the client's location in containers and put together on Gotland in a short space of time," says Mr Ballermann.

He regards this modular design, which is unique to Xergi as a practical and financially advantageous way of constructing small biogas plants.

The plant was built in a couple of months

The digester tanks were built in the specified location in a forested area near the village of Bro, and provided with the required connection points. A crane then lifted the technical modules into place, with all work completed in just four weeks.

"It is, of course, fantastic that Xergi got the plant built and enabled production to start in just a few months," says Björn Palmgaard.

The Brogas biogas plant currently produces 22.6 GWh per year. This is equivalent to 2.26 million m3 of gas or 2.26 million litres of petrol. The plant is connected to an eight-kilometre-long pipeline to Visby, Gotland's largest town.

For further information please contact:
Managing Director Jørgen Ballermann, Xergi A/S, tel: +45 99 35 16 00

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