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decommissioning of a system. Some EU countries have either inefficient or lack energy infrastructure. In the Baltic countries the absence of energy interconnections with the energy systems of Northern and Western Europe, represents a risk for their energy security.
*'''''Standards'''''
Member States have different standards for daily operations and technical construction of gas pipelines. For this reason project execution and time delivery of projects can be problematic. The European Parliament believes that a higher degree of standardization will ease the integration and transmission among countries. <ref>[http://www.europarl.europa.eu/RegData/etudes/note/join/2009/416239/IPOL-ITRE_NT(2009)416239_EN.pdf European Parliament: Gas and Oil pipelines in Europe 2009]</ref> In fact, the parts of the interconnected transmission system within national borders are owned and operated by national entities. The pipeline capacity is allocated on a national basis even if more than 60% of the EU’s gas supply crosses more than one national border.
*'''''Economic issues'''''
Transmission pipeline investments expenditures are very high. The payback time is long and the uncertainties and risks are many. The recovery of those investments is mainly based on long term agreements. Therefore private investors unlikely will ensure sufficient capacity for gas supply at a national level. For this reason, the investors in the pipeline transmission capacity inside the EU are primarily state-owned Transmission System Operators (TSOs), who have natural monopolies as they build, own and operate pipeline infrastructure.<ref>[http://www.europarl.europa.eu/RegData/etudes/note/join/2009/416239/IPOL-ITRE_NT(2009)416239_EN.pdf European Parliament: Gas and Oil pipelines in Europe 2009]</ref> As a consequence, the diversification of gas supply is limited.