Abstract
The gas deregulation process implies crucial choices concerning access to transportation networks. These choices deal with the nature, the structure and the level of access fees. This paper proposes an evaluation of different systems implemented both in Europe and North America, in relation to normative pricing references. The entry-exit system appears today as the best solution to increase competition. The rules for secondary markets represent another kind of choice that Regulators have to make. The Canadian and US experiences show that whether the price on these markets should be capped or not depends on the market power of shippers.