From 1st October 2008 schools in England where there are buildings with a floor area over 1000m2 are legally required to display an Energy Rating certificate showing energy performance on an A-G scale. The rating certificate will look a little like the A-G certificates you see on new fridges and washing machines.
If your school has buildings under this requirement you can download a certificate from this site to give you an indication of what your rating would be under the official process. Schools applying for their Green Flag award can also use these A-G energy certificates as part of their evidence. You can then use this site and the programme activities to help you reduce your energy use and improve your rating!