Diesel prices in Portugal have remained above the efficient price benchmark set by the national energy regulator, ERSE, for six consecutive weeks.
The sustained deviation underscores persistent structural pressures in the domestic fuel market, even as broader European energy dynamics shift.
This development follows a period of intense volatility in Portuguese consumer fuel costs.
Data from the Directorate-General for Energy and Geology showed that diesel prices accelerated sharply in May, rising 30.3% year-on-year, while gasoline 95 increased by 19.3% compared to the same month in 2025.
The current six-week premium suggests that the inflationary pressure on transport fuels has not yet normalized despite earlier market expectations.
The divergence between market prices and the ERSE efficient price raises questions about the effectiveness of current regulatory mechanisms in curbing consumer costs.