It installed more than 20, 000 smart meters, connected them via a fibre-optic network, launched a website to track power use and has started to offer pricing plans that encourage shifting consumption to off-peak hours.

ECONOMIST: Utilities are getting wise to smart meters and grids

National Grid is currently consulting on plans to develop its network to carry electricity from the proposed wind farm and the planned new nuclear power station at Wylfa on Anglesey.

BBC: Rhiannon wind farm: Plans on show in Amlwch