Paper money in the UK used to be incinerated, if they used the heat to generate power, or even just heat water for the facility, then there would still possibly

Paper money in the UK used to be incinerated, if they used the heat to generate power, or even just heat water for the facility, then there would still possibly be some cost in not burning it ... but much though. Not sure if they still burn the plastic money, would be nice to imagine they dissolve it in acid and use it to make more money (but they probably can't because of the dyes, at least).