The energy sector, as one of the most important elements, necessary for the proper functioning of the economy of each country, is also extremely prone to corruption. In Poland and other states around the world, we observe the existence of corruption, inter alia, in connection with the conclusion of contracts for the construction of energy infrastructure, production and distribution of fuel products, gas, and electricity. Entities carrying out crimes by giving and receiving financial benefits are both individuals, e.g. government officials and businesses. Income generated by the energy sector constitute a significant source of income to the state budget, hence assessing the phenomena of corruption in the area of the economy and combating their causes and consequences in this field. This article aims to answer questions on what is the phenomenon of corruption in the Polish energy sector, by comparison, an analysis was made of the problem in the European country (Italy) and the United States. Other goals of this article are: assessment of the scale of corruption in this field and attempt to find the causes of this type of abuse.