The Netherlands Authority for Consumers and Markets (ACM) has made it clear that energy suppliers are not allowed to modify fixed-price contracts for natural gas in response to upcoming regulations, specifically the ETS-2 tax and the blending requirement for green natural gas.

According to ACM, fixed contracts are designed to provide consumers with price stability throughout the contract duration. Any adjustments to these contracts are only permissible under specific circumstances, such as changes in system operation costs, energy taxes, or VAT.

With the introduction of the European ETS-2 system on January 1, 2028, energy suppliers will be required to pay for CO2 emissions associated with natural gas supplied to households. Additionally, the blending requirement for green natural gas will take effect on January 1, 2027, mandating suppliers to incorporate a gradually increasing percentage of green gas into their offerings.

ACM's investigation revealed that some suppliers had included clauses in their fixed contracts allowing for price increases when these new regulations were implemented. Such practices could lead to unexpected costs for consumers and complicate contract comparisons, prompting ACM to prohibit these clauses.

In a letter to all energy suppliers, ACM reiterated the rules regarding fixed contracts and addressed the transition away from the net metering scheme, emphasizing the importance of transparency and compliance in the energy market.