Various: They call it the “energy gap”. Despite the rapid growth and potential of Scotland’s renewable energy sources, the country’s conventionally generated electricity supply is facing a rundown as plants grow old. Of the two remaining nuclear power plants in Scotland, Hunterston B is scheduled for shut-down in 2016, but with the potential for a further extension, and Torness in East Lothian should keep running until 2023. But plans for expansion or the creation of new …