Your electricity data is out of date. Energy Sparks is working with your energy contract manager and energy supplier to fix this problem.
Your school's storage heaters use 550 kWh running during the school holidays when the school is normally empty. This costs £83. At weekends the storage heaters use 1,300 kWh which costs £190. Ask your caretaker to check the timers to save energy.
Measure classroom temperatures to find out whether you should turn down the heating to save energy