Restoring hydro power at Alnwick

A hydro electric system which last operated in 1948 has recently been restored to its former glory in Hulne Park at Alnwick. The electricity produced is used in the Estate’s workshops with surplus going back into the National Grid.

Alnwick Castle is thought to have been one of the first buildings in the North East to have the use of electric power when the hydro system was originally put in during 1889 by the 6th Duke. This was only a few years after Armstrong installed hydro electric power at neighbouring Cragside.

In its heyday the system could power up to 100 electric lamps around the Castle, with the power cable apparently running from the riverside powerhouse, through the coping stones on the wall, across the Lion Bridge and into the Castle, where it was stored in a bank of batteries in one of the Towers. Aside from a minor glitch in 1938 when the system operator, one Alfred P Deeble, was called up by the Royal Navy Reserve, the system operated without major incident until it was decommissioned in 1948 when mains power was finally installed at the Castle.

The Alnwick hydro scheme produces power via a water turbine which is located adjacent to the Cannongate weir on the River Aln in Hulne Park. Surprisingly, an initial inspection found the original turbine to be in extremely good condition given its age and lack of recent use. It has since been refurbished and given a new modern gearbox. The existing powerhouse was also restored and an up to date generator fitted. Filters prevent fish entering the system and automatic shut down controls deal with high and low water levels.