The Dutch Authority for Consumers and Markets (ACM) has issued a decisive ruling preventing energy suppliers from adjusting fixed-rate gas contracts upward to account for impending climate policy expenses. The regulator emphasized that a fixed-price agreement must guarantee consumers a stable tariff for the entire contract duration, regardless of future regulatory changes.
This intervention follows a review by consumer platform Radar, which found that several suppliers had embedded clauses allowing mid-contract price revisions tied to the EU's Emissions Trading System 2 (ETS2) and the Netherlands' proposed green-gas blending mandate (BMV). The ETS2, set to launch in 2028, will impose carbon costs on heating and road fuels, while the BMV, expected by 2027, will require suppliers to source a growing share of green gas.
Budget Thuis, Delta Energie, Innova Energie, Mega, and Vattenfall were identified as having such contractual provisions. According to Energievergelijk.nl, a household consuming 900 cubic meters of gas annually could face extra costs ranging from €72 at Budget Thuis to €326 at Mega by 2028 if these clauses were enforced. A separate analysis by Keuze.nl, in collaboration with homeowners' association Vereniging Eigen Huis, estimated that a four-person household using 1,700 cubic meters could see annual increases of up to €425.
The ACM's stance is notably stricter than the broader political debate on climate cost allocation. Suppliers are permitted to factor anticipated ETS2 and BMV costs into new fixed contracts, but once a deal is signed, the gas delivery tariff cannot be altered. This clarity provides consumers with upfront pricing certainty, though it may lead to higher initial contract rates.
Koen Kuijper, an energy expert at Energievergelijk.nl, highlighted the transparency issue: consumers see the posted gas tariff on supplier websites but must "really have to open the PDF and read it" to discover these adjustment clauses. He noted that his site generally recommends one-year contracts to avoid such complexities. Bart Koenraadt, another expert, added that it remains uncertain whether suppliers will fully exercise these clauses, as they could opt for smaller adjustments or none at all.
For consumers seeking alternatives, major suppliers Eneco, Essent, and Greenchoice offer multiyear contracts without explicit ETS2 or green-gas adjustment clauses, according to Keuze.nl and Energievergelijk.nl. The ACM's action does not eliminate future climate costs but ensures they are transparently included in upfront pricing rather than imposed mid-contract.
The broader context involves ongoing debates over who bears the cost of carbon pricing in the Netherlands. The Netherlands Environmental Assessment Agency (PBL) reported that carbon prices vary widely by sector, with the gap between actual prices and the climate cost—estimated at €174 per tonne of CO2-equivalent—reaching €18.1 billion in 2024, up over €2 billion from 2023. Dutch industry received free allowances covering more than 80% of emissions under ETS1, while agricultural methane and nitrous oxide remain largely unpriced. Households feel the impact through gas taxes, supplier tariffs, and contract terms, highlighting the uneven distribution of climate costs.
The ACM's ruling may also set a precedent. Keuze.nl suggested that any supplier pushing a disputed clause could prompt a court ruling on its legality, potentially reshaping how climate costs are passed to consumers. As the green-gas bill still awaits final parliamentary approval—with the Raad van State flagging insufficient oversight of the proposed trading system—the regulatory landscape remains fluid.
