Satisfied customer orders extension of biogas plant

Xergi is now to double the power output of the biogas plant at the British vegetables producer Staples Vegetables.

A year ago Xergi handed over a biogas plant to the British vegetables producer, Staples Vegetables. After a year with satisfactory operation of the plant, Staples Vegetables has now decided to double the power output of the plant with a new biogas digester and an extra gas engine.

"We are of course very pleased with this new order, as it is shows very clearly that we have built a plant which performs as intended", says project manager Steffen Busk Nielsen.

He explains that the plant which is situated in Wrangle near Boston has performed very well. It produces biogas, electricity, heat, and cooling according to the expectations.

Owners of Staples Vegetables, the brothers George and Vernon Read also express their satisfaction.

"Energy is a major cost for our business and this new facility gives us control over future electricity prices along with security of supply. It also increases the sustainability of our farming and processing operations," says Vernon Read.

From vegetables to green energy and fertiliser

Staples Vegetables produces vegetables for the major supermarket chains in UK. Up to now this production has left the company with a large amount of vegetable waste, which had no value for the company in the past.

The plant makes it possible to extract the gas from the waste and then exploit the gas for renewable energy production in in the form of electricity, heat and cooling. As an additional feedstock maize silage is added to optimise the gas production.

The digested biomass is turned into a valuable bio-fertiliser, which reduces the use of chemical based fertiliser used on the fields of Staples Vegetables.

Power, heat and cooling

The existing plant is built with a 4,000 m3 primary digester, a 4,000 m2 secondary digester and a gas engine with an output of 1,415 kWe.

"The new project comprises a new primary digester of 3,800 m3 as well as installation of a gas engine of 1,560 kWe. The construction is to start in the beginning of May this year, and the new gas engine is to be put into operation in the middle of September", informs Steffen Busk Nielsen.

Staples Vegetables uses a large part of the power production itself, with the surplus being delivered as green electricity to the National Grid. Surplus heat from the power production is used for cooling the company's vegetable stores by using an absorption chiller, which converts the energy of the hot water into cooling. During the winter months the heat from the plant is also used to heat the company's offices.

Xergi has delivered the plant with the latest technologies for e.g. feeding of biomass into the digester tanks as well as electronic supervision and process management of the plant.

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