The aim of this article is analysis of one of the barriers to the functioning of procedures for authorization, certification and licensing of RES investments - lack of coordination in actions of the public administration authorities while conducting those procedures, both in the context of EU law, as much national laws of selected Member States. Why this barrier is still dominant? The article is devoted to analysis of possible and applied models for such coordination in the area of RES investments. Attention has also been drawn to restrictions which should be taken under consideration by Member States while the regulations regarding procedures coordination implementing. Constructing and applying of coordination of public administration authorities activities in such a way as it might contribute to streamlining and accelerating administrative procedures in the area of RES investments and consequently achieve a designated RES energy share in the final gross energy consumption, is not an easy task. Inappropriately constructed and applied mechanisms may lead to an exactly opposite effect.