London restaurants are being asked to donate their waste grease, oil and fat, to help run a special power station.
Thames Water is one of the architects of the plan.
As Martin Stew reports, it hopes it could also lead to restaurants pouring less fat away, which clogs up the capital's sewers:
More top news
The 90-year-old victim watched in horror from her bed as the thief climbed in through her bedroom window.
The remains of Sophie Lionnet, 21, were discovered in a garden at a house in Southfields, south-west London last year.
Port drugged and raped four young men and dumped their bodies near his home in Barking, east London.