Burning things wastes a lot of energy – even burning waste.
1. Plain Old Inefficiency
The systems and infrastructure for the generation and distribution of electricity in the United Kingdom is extremely poor, nigh on immorally wasteful. See the diagram above from the Zero Carbon Britain 2030 report :-
There are so many things that could be done to improve on that enormous loss of energy, and save on Carbon Dioxide Emissions at the same time.