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Case Histories

For detailed examples of the work of The Green Consultancy please follow these links.

Aberystwyth University - monitoring and targeting upgrade

Anglia Ruskin University - monitoring and targeting

Aston University - culture change to reduce energy consumption and carbon emissions

Daily Mail and General Trust - outsourced energy management, etc

Fire Protection Company - energy efficiency audit

Lancaster University - Forensic study to provide information on future District Heating decisions

London School of Hygiene and Tropical Medicine - Achieving Net-Zero Carbon by 2030

Maplin Electronics - ESOS Compliance

Nigerian Industry - ISO 50001 Support

Nuffield Health Fitness & Wellbeing - energy audits and estate-wide upgrades

OVO Energy Ltd - Reducing Energy Consumption by 30%

University of Bristol - District Heating Optimisation, Redesign and Commissioning

University of Chester - Sustainable Design and Construction

University of Leeds - BMS and eSight M&T System Optimisation

University of Oxford - energy efficiency audits and carbon management plan

University of Portsmouth - voltage management investigation

Various Clients - energy saving examples

In addition, over 200 typical client comments are quoted at the foot of relevant service pages.

Put us to the test NOW!  To discuss your requirements please call John Treble on 01761 419081 or email John@GreenConsultancy.com

John Treble

Put us to the test NOW!

For over twenty five years we have been delivering superior outcomes for thousands of commercial, industrial and public-sector clients.

You need not take our word for it – hundreds of their comments are at the foot of these pages.

To discuss your requirements please call John Treble on 01761 419081 or email


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Greatest savings for lowest cost

At the heart of our services is our unique rigorous and scientific energy efficiency methodology - guaranteeing you exceptional value for money.

More about our energy efficiency methodology


TGC is the proud winner of the 2016 Interserve Supplier of the Year Award for Customer Focus.

Here is our consultant Andrew Burt at the award ceremony.

Award winner

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“What I really appreciated about working with The Green Consultancy is their uncompromising promotion of the highest standards of building design in conjunction with efficient mechanical systems and integrated renewable energy systems. I unreservedly recommend their services.”

Professor Susan Roaf AAdipl PhD ARB FRSA School of the Built Environment, Heriot-Watt University


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"John Treble, Founder and Client Services Director of The Green Consultancy, is a true expert on energy management and energy efficiency. He has a no-nonsense grasp on best practices. If you want independent expertise to sound out your energy efficiency plans then he’s well worth contacting."

Simon Brown, Managing Director, 2degrees Solutions


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“John Treble, Founder and Client Services Director of The Green Consultancy, puts clients at the forefront of all business decisions and is tenacious in ensuring that they get what they need. He is honest and straightforward with high and exacting standards.”

Heather Marchant, Former Account Team Leader, The Carbon Trust