By Nicholas Earl The UK’s electricity supply could be tight at times this winter but there should be sufficient supplies to meet demand, revealed the body tasked with balancing the country’s grid. In its latest report ahead of winter, the National Grid’s Electricity System Operator (NGESO) has forecast that margins might narrow significantly towards the very end of the year, however it expects there will be sufficient power to keep the lights on. It said: “We expect there to be sufficient available capacity to respond to these market signals to meet consumer demand.” NGESO’s operational modell…