United Downs Deep Geothermal Power is the first geothermal electricity project in the UK. It is the natural progression of the Camborne School of Mines led Cornish Hot Dry Rocks (HDR) project, undertaken in the 1980s at Rosemanowes Quarry, designed to test and prove the theory of inducing a fracture network within the heat-producing granite to create a geothermal reservoir. Situated near Redruth in Cornwall (UK), the project has now proven that harnessing geothermal energy is possible in the UK, encountering temperatures and fluid flow rates that are capable of driving a steam turbine to generate electricity.
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| - United Downs Deep Geothermal Power is the first geothermal electricity project in the UK. It is the natural progression of the Camborne School of Mines led Cornish Hot Dry Rocks (HDR) project, undertaken in the 1980s at Rosemanowes Quarry, designed to test and prove the theory of inducing a fracture network within the heat-producing granite to create a geothermal reservoir. Situated near Redruth in Cornwall (UK), the project has now proven that harnessing geothermal energy is possible in the UK, encountering temperatures and fluid flow rates that are capable of driving a steam turbine to generate electricity. (en)
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| - United Downs Deep Geothermal Power is the first geothermal electricity project in the UK. It is the natural progression of the Camborne School of Mines led Cornish Hot Dry Rocks (HDR) project, undertaken in the 1980s at Rosemanowes Quarry, designed to test and prove the theory of inducing a fracture network within the heat-producing granite to create a geothermal reservoir. Situated near Redruth in Cornwall (UK), the project has now proven that harnessing geothermal energy is possible in the UK, encountering temperatures and fluid flow rates that are capable of driving a steam turbine to generate electricity. Initiated in 2009, the development is owned and operated by Geothermal Engineering Ltd. (GEL), a privately owned British company founded in 2008 specialising in the development of geothermal resources. The drilling site selected is on the United Downs industrial estate, chosen both for its geological setting and its surface attributes with existing grid connection, close proximity to access roads and limited anticipated impact on the local communities. Drilling began in 2019, with testing completed by mid-2021. By mid-2023 it is estimated that the power plant will generate between 1 and 3 MW of electricity, which will be sold to the National Grid via the UK's first Power Purchase Agreement (PPA) for deep geothermal electricity with Ecotricity. Excess thermal energy will also be distributed locally, with district heating planned to local housing developments and heat-intensive businesses. The geothermal system being employed to generate power at United Downs targeted a radiogenic granite batholith that exhibits enhanced permeability due to its intersection with the Porthtowan Fault Zone. This zone of enhanced permeability was intersected by both the production well (5,275 m measured depth) and the injection well (2,393 m measured depth). During planned operations, hot fluids occurring naturally at more than 5km depth within the granite will be pumped upwards through the deep production well to be used as an electrical and thermal energy source. Resulting cooled fluids are then reinjected into the shallower injection well for gradual recycling into the deep reservoir through natural fractures in the granite, re-capturing its radiogenic heat. The water used for injecting into the reservoir is natural, deep groundwater that does not affect the local water supply. (en)
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