Capital’s business rise to London mayor’s energy challenge

London businesses save 188,000 tonnes of carbon emissions in 2014/15

Sara Kassam, head of sustainability development at CIBSE

More than 100 of London’s leading businesses took part in the 2015 Mayor of London’s Business Energy Challenge, sending in data for a total of 1,600 buildings.

Together, they saved enough energy to power more than 24,000 London households in the capital for a year. This equates to a reduction in carbon emissions from energy use of more than 188,000 tonnes across their London locations in 2014/15.

Sara Kassam, head of sustainability development at CIBSE, judged one of the awards, and the energy consumption of the entries was analysed by a CIBSE-funded researcher at University College London.

The scheme, organised by the Greater London Authority, promotes energy efficiency in businesses and, each year, participating firms – including shops, restaurants, banks and offices – submit the annual energy consumption data of their estates.

The winners of the 2015 challenge have now been announced. For more information on the challenge, and to view the winners, visit