Rising diesel costs are putting fresh pressure on Spain’s agricultural sector, with farmers warning that higher fuel and fertiliser bills could eventually feed through the food supply chain.

The issue has intensified as the temporary government support covering part of agricultural fuel costs approaches its original 30 September expiry date. On Tuesday, 22 September, Agriculture Minister Luis Planas said the government intends to continue support for the agricultural sector, including compensation for higher diesel costs, potentially until the end of 2026.

Agricultural Fuel Costs Have Climbed Sharply

Fuel prices have risen substantially in recent months following the international energy shock linked to the conflict in the Middle East.

Spain’s Ministry of Agriculture’s weekly energy report for 7 September recorded a national weighted average agricultural diesel price of €1.405 per litre, including taxes. The figure was calculated using prices from agricultural diesel stations across mainland Spain and the Balearic Islands, with the ministry weighting public and restricted cooperative sales differently.

The agricultural organisations ASAJA, COAG and UPA have highlighted a higher figure of €1.649 per litre in their recent statements and described agricultural diesel as 48% more expensive than a year earlier. Because the figures use different measures, they should not be treated as interchangeable.

Farmers Warn of Higher Production Costs

Diesel is a significant operating cost for farms because it is used for tractors, machinery and other agricultural activities.

The increase is arriving at an important point in the farming calendar, with autumn field preparation and cereal sowing getting under way while other seasonal activities, including harvesting, are also taking place.

ASAJA has estimated that preparing and sowing around 22 million hectares of land in Spain this autumn could cost the agricultural sector at least €200 million more in diesel than last year. That is the organisation’s calculation rather than an official government estimate.

Could Higher Fuel Costs Reach Supermarket Prices?

Higher agricultural costs can put pressure on the wider food supply chain, but a rise in diesel does not automatically translate into an equivalent increase in supermarket prices.

Fuel is used at several stages, from farm machinery to transporting agricultural products, while prices paid by consumers are also affected by production costs, wholesale and retail margins, imports, weather conditions and market demand.

Recent official inflation data already show that Spain is experiencing higher consumer prices. The National Statistics Institute reported annual CPI inflation of 4.3% in August 2026, while food and non-alcoholic beverages were 2.3% more expensive than a year earlier. Transport prices rose 9.5%, with the INE specifically pointing to higher fuel and lubricant prices as a major factor.

Agricultural Groups Are Calling for More Support

ASAJA, COAG and UPA announced nationwide mobilisation plans in September, arguing that the increase in fuel costs is putting additional pressure on farms.

The organisations have requested continued assistance with fuel costs, as well as measures covering fertilisers and other production expenses.

They have also argued that support should provide greater certainty for the autumn farming campaign rather than being limited to short-term measures. These are the organisations’ stated positions.

The Current Fuel Support Was Due to End on 30 September

The Spanish government extended its special agricultural diesel support in June for a further three months.

Under the measure announced by the Agriculture Ministry, eligible agricultural and livestock producers could continue receiving assistance of up to 20 cents per litre until 30 September. The aid is linked to the system for recovering the Special Tax on Hydrocarbons, so eligible farmers do not need to submit a separate application for the fuel subsidy.

The government allocated €55 million for the agricultural diesel extension, in addition to the earlier funding.

Government Now Plans to Continue the Support

The situation changed on 22 September, when Luis Planas met representatives of ASAJA, COAG, UPA, Unión de Uniones and agricultural cooperatives.

After the meeting, the ministry said the government would continue supporting farmers by compensating the additional cost of agricultural diesel. Planas said the level of support would have to remain within the limits authorised by the European Union, which allow compensation for up to 70% of the additional diesel cost.

The minister also said the government would examine, together with the Finance Ministry, whether the payment mechanism could be made more direct and simpler for farmers.

The Extension Is Not Yet a Final December Payment Scheme

Although the government has indicated that assistance will continue, the precise terms have not yet been finalised.

Planas said 31 December was the likely time horizon for the continued support and that the government would hold further discussions before taking the package to the Council of Ministers.

That means the existing 30 September deadline should not simply be described as the final end of agricultural diesel support. The government has now publicly announced its intention to prolong the compensation, but the new legal and financial details still have to be approved.

Food Inflation Is Already Being Closely Watched

The fuel issue comes at a time when Spanish households are already facing higher prices.

According to the INE, annual consumer inflation reached 4.3% in August, its highest level since February 2023. Food and non-alcoholic beverage prices rose 2.3% year-on-year, while transport recorded a 9.5% annual increase.

The figures do not establish that higher diesel prices caused the increase in food prices. They do, however, show that rising transport and food costs are already part of the wider inflation picture.

What Happens Next?

The immediate focus is now on the government's next package of measures and the details of how agricultural diesel compensation will continue.

Farmers and agricultural organisations will be watching the level and duration of the support, while the wider food sector will be monitoring fuel, fertiliser, transport and other input costs.

For consumers, higher diesel prices create a potential source of additional cost pressure across the food chain, but the eventual effect on supermarket prices will depend on how much of the increase is absorbed by producers and other businesses rather than passed on to customers.