Times (UK): Darren Renshall can’t help himself. As he approaches a spigot amid the din coming from a maze of pipes, he smiles, pulls the lever and out slops a pile of foul-smelling black sludge. The odour is revolting. But the engineer doesn’t seem to care. He is clearly excited about the muck, which is piling up like a mound of mashed potato on the floor. It is what makes this power station, in Widnes on the Mersey, like no other. Instead of using coal or gas to generate electricity, this plant …