Supermarkets continue to be at the forefront of sustainable innovation. While in Berlin a Metro story is growing its own vegetables, a Redner grocery store in Pennsylvania, US, has recently adopted a food waste disposal system called Grind2Energy.
Developed in 2010, the in-store food grinder allows stores and restaurants to divert 3.5 tons of food from landfill every week, converting food waste into renewable energy. Using less than four litres of water a minute, the system creates a slurry that can be used to make biogas. The 44-store grocery chain estimates that the energy produced in a year would be able to power a single-family home for five years.