Spain's CNMC Sets 14:45 Deadline for Day-Ahead Schedule to Stop Intraday Auction Failures
New rules require Red Electrica to publish its day-ahead power schedule by 14:45, closing a procedural gap that has caused intraday auctions to collapse.
Spain's energy regulator CNMC published new operational rules on Friday (2026-08-07) requiring transmission system operator Red Electrica to release its day-ahead power schedule no later than 14:45, a change aimed at preventing failures in intraday power auctions, Montel reported.6
When that schedule is delayed, downstream auction processes break down. Generators and industrial consumers trying to firm up positions are left without a reference point for intraday trading sessions, balancing responsibilities become unclear, and price signals go dark at exactly the moment the market needs them.6
The move comes more than a year after the April 2025 blackout that knocked out power across the Iberian Peninsula, an event that exposed the fragility of a grid carrying an increasingly high share of variable generation. Experts analysing that outage found it had been preceded by extraordinary conditions on the network.3,4
Spain's renewable buildout has been rapid. Wind and solar now account for more than 40% of total electricity supply, and nuclear provides a further 19% of generation, according to the Economist.2 That mix has driven wholesale prices sharply lower: the Bank of Spain calculated that wholesale electricity was 40% cheaper in 2024 than it would have been had the generation mix remained as it was in 2019.2 But high variable-renewable penetration creates operational complexity, with grid operators facing sharper forecast errors, faster ramp rates and more frequent need for ancillary services.
The cost of those services has risen sharply. Balancing costs climbed "brutally" in February and March 2026 and were weighing on energy-intensive consumers as of May 2026 (2026-05-21), market observers told Montel.1 Those costs are a direct function of how much corrective intervention is needed to keep the grid in balance — a problem that worsens as dispatchable capacity thins relative to variable generation.
Red Electrica's task is to manage that balancing act in real time, but intraday markets are a key mechanism through which generators adjust positions ahead of delivery. If the day-ahead schedule arrives too late, market participants have less time to trade into the first intraday session, compressing the window in which imbalances can be corrected through commercial means rather than costlier system operator interventions.6
The 14:45 deadline addresses process, not grid architecture. On days of high renewable variability or tight reserve margins, the window between schedule publication and auction open will still be short. How Red Electrica performs against the new deadline under stress conditions is the real test.6
Industry lobbies have shown limited patience with incremental measures. In the week of 2026-07-13, after CNMC published separate changes to voltage control services designed to draw more renewable plants into system support, major industry lobbies told Montel the new rules did not go far enough.5 Participation requirements for renewable generators in voltage control remained too weak, they argued — a gap that affects the grid's ability to hold voltage stability without relying on conventional plant.
That tension has defined Spain's grid governance debate since the 2025 blackout. Ancillary service costs remain elevated, the adequacy of CNMC's broader reform programme is contested, and the regulator's next move on voltage control requirements is the bigger decision the industry is now watching.5,1