Households across Britain could be paid on Tuesday evening to help take strain off the country’s energy grid as French nuclear plants will be unable to help deal with demand.National Grid’s system operator said it was considering the first ever live run of its Demand Flexibility Service – which is designed to avoid blackouts."Even though wind is coming back for tomorrow evening’s peak, slow return of nukes in France plus lower temperatures may mean that there is a reduction in available imports across the interconnectors"