Power giants top greenhouse gas list

New figures show the top five power companies generated 92 million tonnes of greenhouse gases over the past year.

The ACCC will oppose energy giant AGL's planned takeover of two NSW power stations. (AAP)

Five power station operators accounted for almost a third of Australia's greenhouse gas emissions over the past year.

The Clean Energy Regulator on Friday released its 2012/13 report on greenhouse emissions by corporations.

The top five polluters - Macquarie Generation, AGL Energy, Delta Electricity, International Power and Stanwell Corporation - generated almost 92 million tonnes of carbon emissions out of a total 309 million tonnes.