The article covers the analysis of the most important problematic issues concerning the operation of the cooperative’s power of attorney within the framework of the general meeting, meetings of representatives and meetings of member groups in the cooperative from the perspective of the Supreme Court case law. Research attention was focused on the analysis of discrepancies in the jurisprudence of the Supreme Court regarding the admissibility of replacing a member of a cooperative by a proxy as part of meetings of member groups. The problem
of the legal nature of the power of attorney to replace a member of a cooperative during meetings of the general meeting of the cooperative and the admissibility of using a blank power of attorney in intra-cooperative relations was also discussed.