"We would ask that customers do not phone in to report these dips and only contact us if their electricity is completely off, " added Ms Carson.

BBC: NIE confirm network fault caused Belfast blackout

The authority said there may still be individual, isolated homes which do not have electricity and those affected should contact SSE.

BBC: Homes on Arran lose power again due to a generator problem

Each contact can be independently controlled, on or off, with various levels of electricity.

CNN: Treating depression with electrodes inside the brain