Carrying out an energy audit within your school may seem like a daunting task, and if you are feeling overwhelmed, there is practical help ready to lend a hand. Energy Sparks will carry out an energy audit for you, and even help with implementation of whatever your action steps are after the audit. There is a fee to join and you pay more for more work. The DfE site has lots of information about how you can carry out an audit and also guidance on implementation.
Another useful resource is Eco Driver. This organisation helps schools to understand their energy consumption and emissions, and take action to reduce both. They developed the first version of ecoDriver in 2007 (and won a Microsoft award for this).
They employ CIBSE qualified Low Carbon Consultants who can competently guide clients in their decarbonization journey and who can implement and deliver their Collaborative Energy Efficiency Programme (CEEP).
As a result of their work in energy efficiency, over the last decade plus, they have developed specific expertise in meters, metering technology, and meter data capture. They have also developed partnerships with several organizations which can provide additional services including design, installation and maintenance of building controls and low carbon technologies.