A usage summary is a statement which clearly breaks down the difference between the payments you've made to Glide and your energy usage. This statement is generated after 12 months or at the end of your tenancy (which ever comes first). If you want to check your energy usage at any point throughout the year, you can get an update under the 'My usage' section on your online Glide account area. All you need to do is input accurate and up to date meter readings.
For guidance on reading your meters, please visit this article here