A total of 10 London businesses have won a prize for achieving the highest carbon savings.

The winners of the ‘Business Energy Challenge’ set by the Mayor of London include supermarket Sainsbury’s, Arsenal Football Club and ExCel London.

Around 75% of London’s carbon emissions come from buildings and 43% from workplaces, according to the Mayor’s office.

The competition gathered 110 businesses which reduced 188,000 tonnes of carbon emissions by decreasing their energy usage which would be enough to power more than 24,000 homes.

Arsenal’s energy-friendly upgrades across the Emirates Stadium included installing light sensors and updating a computer-based management system which controls mechanical and electrical equipment.

ExCeL London introduced sensors in its car parks for lighting and is using boiler controls to reduce high water temperatures.

Sainsbury’s used LED lighting and solar panels to reduce carbon emissions.

Boris Johnson said: “London’s businesses continue to prove that economic prosperity and green business practices can go hand in hand, making our city a leading example for others to follow. This year’s entrants have reduced their carbon emissions by the staggering amount of nearly 200,000 tonnes, improving the environment not only for our city but also the country and indeed the wider world.”