The Economic Times

In 2014, Oslo began turning household food waste into biogas; the plant was designed to process 50,000 tonnes a year and fuel 135 city buses

The plant near the Norwegian capital was designed to treat 50,000 tons of food waste per year to produce around 14,000 cubic meters per day of biomethane. The liquefied biogas was then efficiently transported for use as fuel. The original announcement stated that it will convert household food waste into liquid biogas in volumes great enough to fuel 135 buses.