Financial services provider National Australia Group (NAG) has extended its energy and technical services contract with GSH up to 2020 in a deal worth more than £100 million.
The contract will see GSH delivery energy management services to brands including Yorkshire Bank and Clydesdale Bank.
This will include around 450 high stree branches, head office properties and data centres around the UK.
GSH will also carry out refurbishment projects within the terms of the deal.
The new deal will see the company provide guaranteed savings to NAG in excess of £8 million.
The two businesses began their working arrangement in 2007.
NAG head of property Dan Moore said: “We have a strong and evolving CSR programme and are committed to reducing our impact on the environment.
“Over the past five years we have worked closely with GSH and they have played a vital role in helping us to achieve our targets.
“This, and their excellent service delivery record on M&E, are the main reasons that we are happy to commit for the long term to 2020.”
GSH group managing director John Davy said: “By listening to our clients and understanding their business strategy and long-term objectives we were able to develop an energy led engineering model which ensures the same high level of service, while guaranteeing both carbon and financial reductions over the next eight years.”
GSH were this year’s winners of the Outstanding Achievement award at the H&V News Awards.