The article aims to present a few aspects of capacity mechanisms in relation to State aid. Taking the example of the selected Member States, the author of the article discusses the conditions for existence of State aid as referred to in Article 107(1) TFEU in respect to capacity mechanisms. Moreover, the author of the article analyzed Altmark case which has a significant meaning to discussed mater and also identified and discussed key documents of the European Commission which have a significant impact on the formation of capacity mechanisms in accordance with the EU energy policy.