Spain's wholesale electricity market recorded four hours of negative prices on Sunday, September 27, 2026, according to Demócrata. The outlet reported the negative stretch as part of its daily coverage of the country's power pricing.
Coverage from other Spanish outlets put the number of free or negative hours higher. Las Provincias reported six such hours and said the day's price fell 13 percent. Mundo Deportivo published a breakdown of the day's cheapest and most expensive time bands.
The reports cover the wholesale, or mayorista, market rather than the retail tariffs that households and businesses pay. The two are linked but not identical, since retail bills include regulated charges and other costs on top of wholesale prices.
The negative hours fit a pattern seen in the days before. El Mundo published a similar guide to the cheapest and most expensive hours for Saturday, September 26. Expansión reported that on Friday, September 25, the price was set to reach 390 euros per megawatt-hour at its highest point of the day. That contrast — a high peak on Friday followed by negative hours on Sunday — reflects how sharply prices can move across a single week in the Spanish market.
The material reviewed does not specify the exact hours when prices turned negative on Sunday, nor the amounts involved.
Watch for the next round of daily price reports to see whether negative or near-zero hours continue into the coming week.
