The tension between electricity supply and demand has been well flagged coming up to this winter. It’s not that Ireland doesn’t, as a whole, produce enough power for its needs – but at some crunch times, if the wind doesn’t blow hard enough or if a gas-fired generation plant breaks down during a cold evening when everyone turns up the heat and boils the kettle at the same time, a peak in demand risks exceeding the supply available. Then the network operator Eirgrid would have no other choice than temporarily cutting off some customers until the balance is restored. A…

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