The transmission network
The transmission networks operated by GTS consist of pipelines and facilities. The networks are divided in a high pressure grid (HTL) and an intermediate pressure grid (RTL). The HTL is split into in a network transporting Groningen gas (G-gas) and a network transporting High Calorific gas (H-gas). A schematic representation of the HTL network is shown below.
The two HTL networks are connected via blending stations where different combinations of H-gas and nitrogen are blended and injected into the G-gas network. The HTL contains many compressor stations at which the pressure of the gas is increased to facilitate further transport.
The RTL is mainly supplied from the G-gas HTL via metering and pressure control facilities (M&R stations).
At the exit gas is metered and the pressure is adjusted via fiscal metering stations or the combination of fiscal metering and pressure control facilities (GOS).
Gas is fed into the network on entry points. The gas is sourced from indigenous production, upstream networks, neighboring networks, LNG terminals or underground storage facilities. Gas is supplied via exit points to Local Distribution Companies, domestic industries and power plants, border points to neighboring networks and underground storages.