Scotland is the principal source of Britain's renewable energy as well as its oil and gas. What would independence mean for the UK energy market? Would England struggle to source clean energy? Could Scotland continue to subsidise its wind turbines and tidal energy schemes? What would a split mean for energy prices in Scotland and in the rest of the UK?

Tom Heap reports from Edinburgh on an energetic debate that's certain to heat up as the Scottish independence referendum approaches.

Producer: Alasdair Cross.