By Levi Winchester One man has explained how he saved almost £300 this winter by using less energy during “peak” times. Grahame Case, 38, a picture framer and fine art printer from West Lothian, in Scotland, had been looking for ways to cut his electricity bill after his energy costs doubled. He recently came off a cheap long-term fixed tariff, which meant his winter bill went from £153 to £317. To try and cut costs, Grahame decided to test out the Demand Flexibility Service (DFS) after hearing about it from his energy supplier Octopus. The DFS is run by the National Grid ESO and pays people t…