Calorific values

In order to determine the calorific value, the gas composition is ascertained by using a gas chromatograph at representative points in the GTS transmission system. Not every gas receiving station has its own gas chromatograph. In some cases, one single gas chromatograph will serve one hundred gas receiving stations. The process description for gas quality system specifies how the heating value (gas quality) is determined at the transfer points. The table below gives the daily average calorific values for regional network points over the last 7 days. It will be up-dated once a day. The XML files can be used with MS Excel.

Consumers themselves should check whether the above-mentioned information is suitable for the purpose for which this information is applied. GTS is of the opinion that this information is not appropriate for:

  • (On-line) process control, because it relates to a daily average value that is already at least one day old. Quality fluctuations can occur within a short time scale.
  • Determining the energy flow for contract monitoring, because this monitoring should take place on an hourly basis. GTS offers connected parties online information for these purposes.
  • Checks by small consumers of the bills from their energy supplier, because a calorific adjustment is applied to the annual account, which, in addition to the calorific value supplied by GTS, is also dependent on the characteristics (geometry of the pipeline network, categories of customers present, etc) of the regional network concerned. For more information on this subject, please also refer to Consuwijzer (