One of the UK’s biggest food manufacturers is turning to the power of the potato as it seeks new sources of energy to run its factory. In what it says is a world first, 2 Sisters Food Group has installed a £50m plant that allows surplus mash from its production line to be converted into electricity, in a move that should cut carbon emissions by a fifth – and prove that you really can cash in your chips. The company claims its plant in Carlisle should produce 3,500 megawatt hours per year of electricity, or enough to power around 850 homes, and generate a further 5,000 MWh per year in heat for its manufacturing processes. The anaerobic digestion plant takes peelings, unused potato and even whole cottage pies if they would otherwise go to waste. It is the size of a five-storey building and will produce gas that can be used to generate electricity and heat.