Honeywell and Dalkia, the energy service companies, have won the first contracts to give public sector buildings in London a £10m green makeover. Financial Times

The contracts are intended to be the first of a wide-ranging programme to cut carbon emissions across thousands of offices, transport buildings, police stations, hospitals and schools in the capital, making energy savings of up to 25%.

The deals could kick-start an international market in the 'greening' of public and private sector buildings.

London is the world’s first city to have completed the tender process for the initial retrofitting of buildings following a deal developed by the Clinton Climate Initiative for the C40 group of big cities. Other cities, such as Paris and Houston, are working on similar schemes.