BAM’s UK contracting businesses now rank as the greenest firms based on carbon emission measurements from more than 2,000 firms.

The league table is compiled by the Environment Agency and ranks firms on their scores against the Carbon Reduction Commitment.

In this year’s ranking Skanska Construction slips to second place.

Construction firms once again figure well in the top performing companies with Carillion ranking 7th and Costain a worthy 12th.

To reduce its impact on climate change, BAM adopted a target to reduce operational green house gas emissions across the business by 25% by 2015.

So far it has cut use of gas oil through more efficient plant and equipment and changing project profiles within Bam Nuttall.

Introducing duel generators saved up to 60,000 litres of fuel on some projects.

BAM has also improved energy efficiency by more remote metering, better management and control systems and more efficient temporary accommodation for construction sites.

At the Network Rail HQ project in Milton Keynes, BAM saved around £50,000 in energy through better management and control.

Improved accommodation has reduced electricity consumption by between 30-50% through significant increases in insulation levels and better controls.