ERSE Locks the Mercado Regulado Natural-Gas Tariff at +6.4% for the October 2026 to September 2027 Gas Year — Two-Adult Household Bill Climbs €0.91 a Month and Four-Member Family Picks Up €1.62

The Entidade Reguladora dos Serviços Energéticos (ERSE, Energy Services Regulatory Authority) confirmed on Monday 1 June 2026 a 6.4% increase in the regulated-market natural-gas tariff for the gas year running from 1 October 2026 to 30 September 2027, after the Tariff Council (Conselho Tarifário) review of the regulator's March draft pencilled at 6.3%. The Mercado Regulado (Regulated Market) covers households consuming up to 10,000 m³ per year — effectively the entire residential segment.

The headline figure lands four-and-a-half times the 1.5% adjustment ERSE applied for the 2025/2026 gas year and is the steepest mercado-regulado uplift since the 2022-2023 energy-price spike. ERSE attributes the move to a tighter international wholesale-gas frame, with reference prices on the Iberian MIBGAS hub firming through Q1 and Q2 2026 on the back of supply uncertainty linked to the Middle East conflict and to lower European storage carry-over into the 2026/2027 injection window.

ERSE published a simulator-anchored impact reading. A two-adult Portuguese household without children — the regulator's reference type-1 consumer (kitchen use only) — sees the monthly gas bill climb by approximately €0.91 to a final €17.38, an annualised €10.92 increment. A four-member household (couple plus two children, type-2 consumer covering kitchen and water heating) picks up around €1.62 a month for a final €32.53 bill — €19.44 a year. ERSE's stylised type-3 consumer (kitchen, water heating and central heating) faces a larger absolute hit but the regulator did not publish a numeric stylisation for that band in the 1 June note.

The regulated-market customer base in continental Portugal has shrunk steadily since the 2022 liberalisation push, with most households on retail-competitive contracts where the price-setting mechanism is contractual rather than regulatory. ERSE's mercado-regulado tariff nonetheless sets the regulatory floor and the salvaguarda (backstop) reference price for transitions out of the liberalised market, and movements feed into the social-tariff calculation under Decreto-Lei 101/2011 (Tarifa Social de Gás Natural). The Tarifa Social discount of 31.2% is applied on the regulated price, so the absolute monetary value of the social discount mechanically rises with the tariff, but social-tariff households still face a net increase in the cash bill.

ERSE's note identified three drivers behind the 6.4% reading. The first is the wholesale-energy cost block (around 60% of the regulated bill), which rose on Iberian MIBGAS futures and on the cost of LNG cargoes regasified at Sines. The second is grid access (URG and TUR), which carries the cost of TIGRG (regasification), TIGT (high-pressure transport) and TIGD (distribution) and which ERSE held broadly flat. The third is the storage-and-strategic-reserve uplift tied to the European Commission's 90%-by-1-November storage obligation.

Households on the liberalised market are not directly bound by the ERSE adjustment but the new regulated number sets the comparative benchmark that retailers — Galp Energia, EDP Comercial, Iberdrola, Endesa, Repsol — typically track when repricing fixed-term offers around the October cut-over. Consumers shopping at the comparador.erse.pt simulator from October will see liberalised offers cluster within ±5% of the regulated reference.