Fuel prices in Portugal: week 2 of 2026 starting 5 January

Gareth Wainwright • June 07, 2026 01:35

The second week of 2026, which began on 5 January, opened with small movements in fuel prices - but not quite in the way that had been expected.

Unleaded petrol and standard diesel: average prices

A fall in the price of unleaded petrol had been forecast for last week, yet it did not materialise and the average remained unchanged. By contrast, standard diesel - which had been expected to hold steady - edged up by 0,003 euros per litre.

In practical terms, that leaves unleaded petrol at 1,661 €/l, while standard diesel has risen to 1,536 €/l.

Changes by Galp, Repsol and BP

Even though the average petrol price did not move, some brands made their own adjustments. Galp and Repsol cut their unleaded petrol prices by 0,7 cents per litre, and BP reduced its price by half a cent.

For standard diesel, Galp, BP and Repsol increased prices by 0,3, 0,5 and 0,8 cents per litre, respectively.

How the DGEG figures are calculated

As usual, the reference basis for these fuel prices comes from data published by the Directorate-General for Energy and Geology (DGEG). In this case, the figures relate to last Friday, 2 January.

The DGEG values already factor in the discounts applied by fuel retailers, along with the government measures currently in force. Even so, it is important to stress that these are average, indicative figures and may not match the prices displayed at individual filling stations.

Government measures currently in force

The government measures introduced in 2022 to cushion the rise in fuel prices remain in place, focusing mainly on the level of the Tax on Petroleum Products (ISP). However, these measures are being rolled back gradually, also due to European Union requirements.

At the end of November, the unit amount of the Tax on Petroleum Products (ISP) was revised to 497,52 euros per 1000 litres for petrol and 361,60 euros per 1000 litres for diesel.

This update corresponds to a tax increase per litre of around 1,6 cents on petrol and more than 2,4 cents on diesel.

With these changes, the “tax discount” has shrunk and, despite the decline that has been seen in fuel prices, people in Portugal are not benefiting from it in full.