Portugal's Gas Regulator Proposes 6.3% Tariff Increase for October as War Pushes Up Energy Costs

Portugal's energy regulator ERSE has proposed a 6.3% average increase in natural gas tariffs for the gas year starting October 1, 2026, citing rising acquisition costs driven by the Middle East conflict and declining demand that pushes up network access fees.

The proposed increase would add approximately €0.89 per month to bills for a two-person household and €1.58 for a family of four, according to ERSE's calculations published Monday.

The tariff hike stems from two main factors: higher gas acquisition costs tied to long-term contracts indexed to oil prices, and rising network access tariffs as Portugal's gas consumption continues to fall while infrastructure investment grows.

Oil-Indexed Contracts Drive Gas Costs Higher

Portugal's regulated gas market remains partly tied to legacy take-or-pay contracts between Galp and Nigeria signed before market liberalization. These contracts partially track Brent crude oil prices, which surged following the February 28 U.S.-Israeli strikes on Iran.

ERSE noted that any current forecast carries high uncertainty and depends on conflict duration, the reopening of the Strait of Hormuz, damage to regional energy infrastructure, effectiveness of strategic reserve releases, and alternative production responses from other oil producers.

The regulator committed to closely monitoring market conditions and geopolitical developments before publishing final tariffs in June, and said it would reassess forecasts if needed.

Falling Demand Pushes Up Per-Unit Costs

Network access tariffs—charged to recover fixed costs of operating Portugal's gas infrastructure—are rising as gas demand declines. With fewer cubic meters of gas flowing through the system, the fixed costs are spread across a smaller volume, driving up the per-unit price.

Network access tariffs mainly recover the allowed revenues for operating national gas system activities, largely associated with fixed costs, ERSE explained. A decrease in gas demand in these infrastructures contributes to an increase in costs per unit of natural gas consumed.

Portugal has been steadily reducing gas consumption as renewables expand. The country's renewable electricity generation hit 79% in 2025, reducing reliance on gas-fired power plants.

Five-Year Average: 5.3% Annual Increase

ERSE noted that with this proposal, regulated market prices will have increased an average of 5.3% per year over the past five years—a period spanning Russia's invasion of Ukraine, subsequent gas market reforms, and now the Middle East energy shock.

The proposed tariffs will affect approximately 437,000 consumers who remained in the regulated market as of June 2025. Customers in the liberalized market face pricing set by their chosen supplier based on contracted commercial offers.

What Happens Next

The proposal now goes to the Tariff Council for review before final approval. The new tariffs will take effect October 1, 2026, and remain in force until September 30, 2027.

Portugal has already implemented several measures to cushion households from energy price spikes, including a €25 gas bill subsidy and fuel tax cuts. The government has also signaled readiness for additional structural measures if the conflict persists.

While Portugal's high renewable energy share has provided some insulation from the worst of Europe's energy crisis, the country's gas market remains exposed through legacy contracts and imported LNG. The European Commission called an emergency energy ministers' meeting last week as gas prices jumped 70% since the conflict began.

For households, the October increase would mark another step in the gradual unwinding of pandemic-era subsidies and the return to cost-reflective energy pricing—complicated now by a war 6,000 kilometers away.