At the bottom of the Live Data Display field there is a "Total Energy" ticker. This ticker shows the amount of energy - electricity - that the chosen PV array has generated since it was connected to the live data feed. You can find the connection date for a particular array by going to the UQ PV Sites page, navigating to the site and array of interest and then looking for the entry next to "Date Connected to Display".

If you are viewing "All Sites Combined" then the energy ticker shows the total amount of electricity recorded by all of the University of Queensland live PV sites since the first site was connected to the live data feed (June 2011).  During 2012 the University is planning to connect all of its sites to the display.