Peak Supply

As a result of Article 3.64 of the Energy Act and Article 3.30 of the Energy Decree, GTS is obliged to make arrangements for peak supply to suppliers serving small consumers (consumption categories G1A and G2A). Actual peak supply occurs when the average effective daily temperature in De Bilt is –9 °C (degrees Celsius). In this case, GTS will supply gas to suppliers in the small consumer market.For these arrangements (gas procurement, flexibility services and gas transport), GTS determines the required capacity and volume for peak supply each year.The required amounts are calculated based on historical temperature ranges and consumption in the previous winters on the relevant network points. The transport costs (entry and exit) that GTS reserves for Peak Supply during the winter months December, January and February, will be invoiced to the suppliers of small consumers (in these winter months) in proportion to their market share in the small consumer segment. The peak production tariff will be invoiced to the suppliers each month of the year, also in proportion to their market share.

Actual Peak Supply is the case when the effective daily temperature is below -9 ºC. In this situation, the peak threshold (=winter hourly fraction times the standard year usage) that GTS calculates each month per shipper will be exceeded. When the peak threshold is exceeded, the excess will be allocated back to the shipper via an entry allocation on the Virtual Point Peak Supply (NWP 301444). The excess volume that is allocated on this virtual point peak supply will be invoiced to the concerned suppliers in the next month.

The full text of the regulation (only available in Dutch) and an example calculation sheet can be found below.

Example calculations of peak invoices and costs can be found below.

GTS determined the tariff for peak supply in 2026. The peak tariff consists of two components: the peak supply tariff for production and peak supply tariffs for transport capacity.

The peak supply tariff for production consists of LNG Peakshaver installation usage costs, costs of the capacity purchased through a tender and costs to keep gas available. In addition, the tariff includes corrections to the peak supply costs from earlier years.

The peak entry supply tariffs for transport capacity consist of the costs of entry transport capacity for the Peakshaver for the months January and February 2026. As the completion of the peak supply task for winter 2026-2027 is not clear yet, the peak entry transport capacity tariff for December 2026 has been set to zero. If applicable, these costs will be settled in the 2027 peak tariff.

The peak exit transport capacity tariffs consist of the costs for exit transport capacity that GTS reserves on the connection between the national gas transmission network of GTS and the regional gas transmission networks.