This website allows UK energy customers with smart meters to access their energy consumption data, and to perform a range of calculations on the back of this, for example reconciling bills and tracking carbon intensity.
If you are new to this site, I recommend taking a look at the Getting Started page.
You are running this in demo mode (ie without a key), which is designed to show you the functionality with electricity consumption data from a made up user. You can try out the functionality using this demo data. Alternatively, you can load your own data from Octopus or n3rgy (which can include gas consumption or electricity export), by selecting the option from the dropdown list below.