The number of homes and businesses being upgraded for improved energy efficiency each year needs to be trebled if Ireland is to achieve its 2020 energy efficiency targets.

A report from the Sustainable Energy Authority of Ireland also says the number of homes using renewable heat technology needs to be increased sevenfold.

This is the first time any official organisation has outlined tangible details of the transformation needed to achieve Ireland’s energy efficiency and renewable targets by 2020.

It says that 75,000 homes and businesses need to be upgraded for improved energy efficiency every year between now and 2020 - three times more than now.

40,000 homes already have renewable heat technology, such as a solar panel or a heat pump, but seven times more than that is needed by the end of the decade.

Around 167 million litres of bio fuel is added to our petrol and diesel each year, but that needs to be tripled.

And one fifth of new cars would have to be electric cars within the next five years.

The SEAI report is being published at the Energy Show at the RDS later today.