The company will carry out improvement works on 23km worth of tunnels and aims to save BT around £1.5m on energy costs.
In addition, the project will remove 3,500 tonnes of CO2 from BT's carbon footprint.
Spie has already delivered a scheme to upgrade Environmental Ventilation & Humidity Control. Work to improve the Building Management System & Controls is scheduled for completion in 2017.
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So far, Spie have provided BT with cost planning and risk management consultancy alongside design and technical management. The company will now design and install a control system to reduce energy, improve the lifecycle of the plant and technical equipment as well as warn of flood potential.
BT has also approached Spie UK to undertake a review of its tunnelling system in Edinburgh.
The company's Director of Energy and Engineering, George Adams, said: "The BT Tunnel contract and SPIE's relationship with BT is founded upon innovation and engineering quality, supported by an outstanding project management process."
(LM/CD)
