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”.

“We think energy bills could go from $35 a week down to $2 a week, and maybe eventually zero.”

That’s an enviable position, given the Australian Energy Regulator has indicated some households could pay as much as $2,500 on electricity bills this year,.

It offered $1 billion to households in cheap loans for energy upgrades, $310 million in tax deductions for businesses that invest in renewable energy, and $300 million in funding to electrify public housing - to be matched by the states.

The average Australian house has an energy efficiency rating of 1.8 stars out of 10, according to the Nationwide House Energy Rating Scheme.

Australians are doing these things to save on rising energy bills.