Energy used Financial year Total energy MJ1 519 508 440 466 669 113 Commonwealth benchmark MJ2 585 050 621 590 684 370 Best practice existing building MJ3 417 566 439 113 478 864 New building design target MJ3 296 174 311 457 339 652 MJ/average FTE staff4 17 078 13 507 18 479 Space per person (sqm)5 18.5 18.1 17.8 MJ/space per person 28 135 24 305 37 590 Change in MJ/space per person 13% -14% 55% 1 Sum of total gas and electricity usage, where 1 kWh = 3.6 MJ.