A fortnight after Prime Minister Kevin Rudd made boosting economic productivity one of his top priorities, political rivals have blasted the government for burying a research report that found potentially large energy savings for households and businesses.

The government report, Investigation of a National Energy Savings Initiative, found that extending energy efficiency programs now running in NSW and Victoria could save the economy as much as $5.26 billion if converted into a national scheme.

It found participating households could cut annual electricity bills by 10 per cent by 2020, or about $180 in 2012 terms.

With rising energy bills a concern for many families and firms, the government's posting of the report on a ministry website late on Friday afternoon with only some industry groups informed surprised energy experts and drew criticism from the Coalition and Greens.