Around 300,000 more homes are likely to have been pushed into "fuel poverty" by Christmas, a campaign group has warned.
The Fuel Poverty Advisory Group says six million people are now struggling to pay their energy bills.
It comes as the industry regulator Ofgem announced a multi-billion pound network upgrade, adding yet more to the bill of every consumer.
Stephen Douglas reports:
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Satoshi Uematsu, 26, was sent to the Yokohama District Public Prosecutors Office in Kanagawa prefecture.
West Yorkshire Police confirmed a 32-year-old woman was taken into custody in connection with the alleged threats.