Unfortunately, the government definition of 'renewable' in this case includes 'biomass' which in the case of Drax means chopping down American forests and burning them, dumping the carbon into the atmosphere. Which of course leaves a bunch of carbon in the atmosphere, as it takes a hundred years for replacement trees to soak up the released carbon [1].

Makes no sense from a climate change perspective IMHO - I can't see why the government accepts it, except as a way of cooking the books to hit their own renewables targets.

[1] https://iopscience.iop.org/article/10.1088/1748-9326/aaa512/...