Nowadays the global climate change has been a worldwide concern and the greenhouse gases emissions are considered as the primary cause of that. According to the UNCED Iran is not required to submit annual GHG inventory report. However Iran as one of the biggest producers of oil and natural gas in the world should be involved. So it is necessary to prepare such a report at least unofficially. In this paper, first the terminology and the methods to calculate GHG emissions will be explained and then GHG emissions calculation results for the Iranian power plants will be presented
