London Fire Brigade has been given accreditation from the Carbon Trust - the UK's only independent award recognising achievements in reducing energy use.
Judges highlighted the brigade's £4million investment programme in energy efficiency and renewable energy projects across 70 fire stations.
Solar panels and wind turbines have also been installed at fire stations throughout the capital.
The news comes at the end of the brigade's green month, an internal campaign urging firefighters and non-uniformed staff to reduce their energy usage.
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