The new State aid rules for 2014-2020 explicitly allow the granting of State aid for several types of infrastructure (research, energy, local, etc). The aid must be for the benefit of owners or operators of infrastructure. Users must be charged a market price or a price that covers either full or incremental costs. This paper examines how Member States can prevent the leakage of aid to the benefit of users. The paper, however, also criticises current rules for not being clear as to how to define market prices and the costs that should be charged to users.