United Downs Deep Geothermal Power
Sited on the United Downs industrial estate, the plant will generate 10 MW of electricity to be sold to the National Grid; and 55 MW of thermal energy, to be distributed locally. It is being developed by Geothermal Engineering Limited, a privately owned British company founded in 2008 specialising in the development of geothermal resources.
The Enhanced Geothermal System being employed to generate power at United Downs targets volumes of rock that already exhibit enhanced permeability. The plan for United Downs is to drill three boreholes to a true depth of 4.5 kilometres (2.8 mi). Water is pumped down a borehole which then travels through fractures in the rock, capturing the heat, until it is pumped out of one or more production boreholes as very hot pressurised water which is then converted into electricity using a steam turbine. The water for charging the reservoir will come from flooded mines, not from the local water supply. The hot water produced by the plant can also be used to supply thermal energy and air conditioning (via an absorption chiller) to the surrounding area.
Geothermal Engineering announced the plans for the United Downs geothermal power station in October 2009 and held a local consultation in Carharrack in the same month. In December 2009 the company received £1.475 million in funding from the Department of Energy and Climate Change.
On 13 August 2010 the United Downs plant was granted planning permission by Cornwall Council in a unanimous vote. At that time, the drilling of the first well was expected to begin in early 2011 and the plant was expected to be operational by 2013-2014.
In November 2011, Geothermal Engineering was awarded a grant of £6m from the European Regional Development Fund towards the cost of the project and drilling of the first well was expected to begin in late 2012.
In April 2013, the grant was withdrawn due to the company's failure to attract private funding for the project.
In 2017, United Downs looked at raise £4.4m of private funding via debentures offered by renewable energy debit crowdfunding specialists Abundance Investment. It reached its target in the first week of August 2017, less than a fortnight after being listed. Abundance planned to then raise further funds by issuing more debentures of £95,000 or over, with the total raised to be a maximum of £5.27m.
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