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Engineer Ross Harding thinks energy bills at an apartment block in Melbourne could come in at $2 a week after millions were spent on what is thought to be Australia's “first energy-plus retrofit”.

New south walesAl iskandariyahAustralian capital territoryWorld health organizationAl qahirahMichi moseNathan hageChris bowenMichi mosesKristy battistaRoss hardingWilam ngarrangLukas cochJoel dignamChris bowen energyAustralian energy regulator