The device was installed to protect the Superdome equipment in case of a cable failure between the switchgear and the stadium.

WSJ: Super Bowl Outage Traced to Faulty Entergy Gear

During 2012, Guernsey experienced a number of major power cuts, as well as the failure of its undersea cable link to France.

BBC: Guernsey's States begins consultation on electricity

The price rise is to offset additional costs faced by Guernsey Electricity after a cable link failure to France forced it to produce on-island power.

BBC: Guernsey's 9% electricity rise expected to remain