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This document summarises the findings of the REgions project on the limitations identified for the supply of network services from a Virtual Power Plant of distributed Renewable Energy Sources. These are divided mainly among Technical and Regulatory barriers. The report continues defining Guidelines and finish with a plan for a final dissemination to stakeholders. Among the technical barriers, it is possible to mention 1) the ones related to Market Access, 2) the challenges for scaling up the solution and the interoperability among the solutions of different vendors in absence of standardisation, 3) the characteristics of service provision and finally 4) issues related to ITC resilience and security. Among the regulatory barriers, a focus is made on the situation in Austria, as an example of a typical European country, and attention is paid to: 1) the subsidy regime for renewables and 2) the support for new installation and 3) for existing installations. Guidelines cover mainly the 1) provision of redispatch, of 2) balancing, with attention to the distortions introduced by current subsidies and 3) the provision of demand response. Finally, an analysis is given considering the current energy crisis.