Gasunie focuses specifically on gas transport activities. They include the maintenance and development of the gas transport grid as well as the offering of gas transport and related services. The organization also provides a range of related services, including engineering and research. Since its foundation in 1963, Gasunie has successfully ensured uninterrupted and safe gas transport in the Netherlands. As a fully owned subsidiary of Gasunie, Gas Transport Services B.V. (GTS) is responsible for the performance of statutory tasks relating to the independent management of the gas transport grid. Gasunie Deutschland GmbH & Co. KG is responsible for the North German network.

The European gas market is liberalized. The Netherlands has already advanced quite far in this process. As part of the liberalization, trade and transport of natural gas are separated all over Europe. The idea behind the separation is that, with independent transport, every supplier of gas will have equal opportunities to market gas, and that competition in the market will function better this way. European directives have been drawn up for the separation of trade and transport. In the Netherlands, these have been incorporated in the new Gas Act. To ensure that the Gas Act is correctly complied with, the State has installed a regulator, the Energiekamer. The Energiekamer concentrates chiefly on the activities of GTS.