The Hydro Turbine
Throughout 2017 the Hydro Turbine, which sits on the River Teign was restored so that it once again utilises the power of the river.
The story of hydroelectric power at Castle Drogo began in 1916. At the same time as Castle Drogo was being built Julius Drewe wrote to Gilbert Gilkes and Co. (a well-established engineering company specialising in hydro-electricity generation) to enquire whether it was possible on the river Teign.
Work didn’t actually start until 1927, Sir Edwin Lutyens designed the building and Gilbert Gilkes and Co. installed 2 turbines. By March 1929 the turbines were producing electricity which supplied the castle. There were 332 electrical plug socks installed throughout the castle to power all of the gadgets in Julius Drewe’s thoroughly modern home.
The supply wasn’t always reliable as one family member recalls, “when it was windy the power was unreliable and mother was never able to have a washing machine.”
As part of the National Trust’s objective to produce 50% of its energy from renewable sources by 2020 and using a building for its original purpose, throughout 2017 work was undertaken to reinstate the hydro turbine.
" We’re absolutely delighted that after all this time, we can finally fully reinstate the entire character of this remarkable place, with its renewable energy system powering the property once again. It’s is fantastic to be able to share with the public for the first time what must have been absolutely unique in its day – and the message of generating sustainable , renewable energy is something that resonates with all of us even today, in an age where talking climate change is an increasingly urgent issue."
The majority of the original infrastructure was found to be sound and reusable. The 2 Francis turbines were sensitively restored and the concrete pipe which takes the water from the weir to the turbine house was still in good condition.
As well as restoration, the project also required the installation of new elements, including a state of the art intake screening system, which will ensure that fish and eels cannot enter the turbine system. A new cable was also been installed to bring the power directly to the visitor centre.
The turbine house was commissioned in late October 2017 and has been generating electricity even since, as long as there is sufficient water in the river Teign.
The electricity is used by the visitor centre and any excess is used to heat one of the boilers in the biomass house so there is no waste.