ESB Logo

To view this presentation, you will need to upgrade your browser to a modern version for security and performance improvements. Visit Browse Happy to find out more.

If you are using a legacy version of Internet Explorer, please also ensure that 'Compatibility Mode' is turned off.


To view this website, please turn your device around into 'landscape' mode.

ESB Logo

Unfortunately you cannot view the presentation unless your browser window is 1024 x 700 pixels or bigger in size. Please try resizing your browser or using a bigger screen.

You may also try adjusting the 'zoom' value to 90% or less if your browser supports this feature, but please be aware that this will reduce the visual clarity of the presentation.

Pumping Mode

220kV Electrical Compound

Pumping Mode describes when Turlough Hill operates in reverse to carry the water back up from Lough Nahanagan to the Upper Reservoir.

To start the pumping process, electricity is imported from the ESB Network via the 220kV Electrical Compound.