Why are gas transport costs set to rise so sharply in 2026?

National transmission tariffs are set annually by the Netherlands Authority for Consumers and Markets (ACM). For 2026, the ACM has determined that GTS’s transmission tariff will rise by an average of approximately 50%. This is mainly due to the fact that total gas consumption in the Netherlands is falling, meaning that costs are spread across a smaller volume. In addition, adjustments to GTS’s revenue are higher due to factors including rising energy costs and higher interest rates.