Hydro Ogwen


Civil engineering design of a local community hydro-electric generating plant

Datrys was commissioned to provide the civil engineering design of the hydro-electric generating plant, Hydro Ogwen, a  cooperative venture to harness the power of the Ogwen River in Gwynedd.

Datrys designed the Intake Wier and Powerhouse of the plant which is a low drop 100 kW scheme located approximately 0.4 miles south of Bethesda.

Hydro Ogwen is expected to generate approximately 500 MWh annually – enough to supply about 100 households and offset more than 245 tonnes of CO2 emissions.  This energy will be fed directly to the National Grid.

Hydro Ogwen is expected to start generating electricity before the end of 2016.

Project Details

  • Cost: £0.5m
  • Project: Hydro Ogwen
  • Client: Ynni Ogwen Cyf
  • Location: South of Bethesda, Gwynedd, North Wales

First developed by Partneriaeth Ogwen, the Hydro Ogwen scheme is owned and run by Ynni Ogwen Cyf, a community benefit company.

Capital to fund the plant was raised through a community share offer and the disposable profits it generates will be gift-aided to a charity, set up by Ynni Ogwen, to distribute back into local communities.



Caernarfon: 01286 671027

Mold: 01352 706205

Email: info@datrys.coop


Institution of Civil Engineers (ICE) Approved Employer
Approved to operate the ICE training scheme