Energy determination
When gas is transferred from the GTS network, GTS determines the quantity of energy transferred.
This energy determination is very important for correct invoicing. GTS and its customers both use the data for invoicing. The correct determination of the quantity of energy transferred is guaranteed in the fiscal process. To guarantee the quality of this fiscal process, numerous checks have been built into the process, certified by an independent body (ISO 9001). The fiscal process is described in a number of documents that are further explained below. In addition, a performance evaluation is regularly carried out.
| Evaluation Gas Quality System 2024 | File extension pdf | File size 573 kB | Date last updated 17 Sep 2025 |
| Evaluation Gas Quality System 2023 | File extension pdf | File size 569 kB | Date last updated 18 Nov 2024 |
| Evaluation volume quantity system 2023 | File extension pdf | File size 533 kB | Date last updated 11 Sep 2024 |
| Evaluation Gas Quality System 2022 | File extension | File size | Date last updated 18 Jan 2024 |
| Evaluation volume quantity system 2022 | File extension pdf | File size 507 kB | Date last updated 22 Dec 2023 |
| Evaluation Gas Quality System 2021 | File extension pdf | File size 1 MB | Date last updated 13 Apr 2023 |
| Evaluation volume quantity system 2021 | File extension pdf | File size 667 kB | Date last updated 13 Apr 2023 |
| Evaluation Gas Quality system 2020 | File extension pdf | File size 1008 kB | Date last updated 13 Apr 2023 |
| Evaluation Gas Quantity system 2020 | File extension pdf | File size 919 kB | Date last updated 13 Apr 2023 |
| Evaluation Gas Quality System 2019 | File extension pdf | File size 1013 kB | Date last updated 25 Apr 2023 |
| Evaluation volume quantity system 2019 | File extension pdf | File size 956 kB | Date last updated 13 Apr 2023 |
| Evaluation volume quantity system 2018 | File extension pdf | File size 254 kB | Date last updated 13 Apr 2023 |
Process description
The description of the fiscal process is subdivided as follows:
- Determination of the delivered volume.
- The gas quality system, in which it is stipulated how the heating value (gas quality) is determined at the transfer points.
- A list of the settings of the volume conversion instruments (EVHI) has been added. This list is typical per gas area.
| Description volume quantity system | File extension pdf | File size 271 kB | Date last updated 13 Apr 2023 |
| Description Gas Quantity system 2025 | File extension pdf | File size 1 MB | Date last updated 08 Jul 2025 |
| Description Gas Quantity system 2024 | File extension pdf | File size 1 MB | Date last updated 30 Jul 2024 |
| Description Gas Quantity system 2023 | File extension pdf | File size 585 kB | Date last updated 18 Jan 2024 |
| List EVHI setting parameters 2024 | File extension pdf | File size 403 kB | Date last updated 30 Jul 2024 |
| List EVHI setting parameters 2024 | File extension xlsx | File size 82 kB | Date last updated 30 Jul 2024 |
Performance evaluation
The critical performance indicators of the fiscal process are checked with the conditions as stated in the Metering Conditions (in Dutch: ‘Meetcode Gas LNB’). The performance evaluation is subdivided into:
- the performance evaluation of the gas quantity determination. This document also gives a description of the overall performance regarding the energy determination;
- the performance evaluation of the gas quality determination.