Terry Macalister: The real reason why renewable power should not be devastated by governments run by Trump – or even Theresa May – is that it is on a roll. The price of clean power is falling all the time and even if politicians are unwilling to act on that, many businesses are taking matters into their own hands anyway. New estimates from the Department for Business, Energy and Industrial Strategy released last week showed government expects the costs of large-scale solar PV built in Britain to fall to £67 per megawatt hour by 2020. That compares to the £92 figure used just three years ago and the £92.50 subsidy used for Hinkley Point C nuclear power station running for 35 years. The solar figure for 2030 assessed by BEIS is £60, cheaper than onshore wind and combined cycle gas turbine plants.