Southampton City Council has come out on top of an energy efficiency league table of local authorities.
Insulation firm Knauf produced the Local Authority Energy Index by measuring management of power use within buildings as well as development of green energy infrastructure.
Southampton scored 74.12, with Kingston upon Hull just behind on 73.48, followed by Peterborough with 72.83.
Swindon was ranked as the worst performing local authority of the 25 measured in the inaugural report, the Wiltshire borough council achieving just 36.78.
Knauf said in the report: “This index is designed as a pilot tool to measure the state of play in local authority energy efficiency and to assist authorities that want to improve their performance in this vital area.”