Soto de Ribera
Combined-cycle gas plant in Asturias, Spain; EDP says it was offline during the 2025 blackout.
Last refreshed: 18 May 2026 · Appears in 1 active topic
Was Soto de Ribera actually offline during the April 2025 Spanish blackout?
Timeline for Soto de Ribera
Spain opens 63 cases over April 2025 blackout
European Energy Markets- Where is the Soto de Ribera power plant in Spain?
- Soto de Ribera is located in Asturias, northwestern Spain, on the outskirts of Oviedo near the Nalón river. It is operated by EDP España and is one of the few major combined-cycle gas plants in the northern Spanish grid, a region that relies more heavily on hydroelectric and wind generation than the southern meseta.Source: Lowdown European Energy Markets
- What is Soto de Ribera's capacity and what does it generate?
- Soto de Ribera has approximately 825 MW of combined-cycle gas-fired capacity across three generation groups. As a combined-cycle plant, it uses gas turbines alongside steam turbines to achieve higher efficiency than simple-cycle gas plants. It provides flexible generation that can ramp up quickly to support grid frequency.Source: Lowdown European Energy Markets
- Was Soto de Ribera actually offline during the April 2025 Spanish blackout?
- EDP España claims Soto de Ribera was not operating at the time of the April 2025 Iberian blackout, which is the basis of its defence before CNMC. Whether the plant was genuinely offline or in a reduced-output state at the critical moment is a factual question that CNMC's investigation is examining using grid dispatch records.Source: Lowdown European Energy Markets
- Why does it matter whether a gas plant was online during the 2025 Iberian blackout?
- Combined-cycle gas plants like Soto de Ribera provide frequency regulation services and dispatchable backup during grid stress. If available units failed to respond or were unexpectedly offline when frequency collapsed during the April 2025 blackout, that constitutes a potential regulatory breach. CNMC's investigation assesses each generator's dispatch obligations against actual behaviour.Source: Lowdown European Energy Markets
Background
Soto de Ribera is a combined-cycle gas-fired power plant located in Asturias, in northwestern Spain, operated by EDP España. The plant has a capacity of approximately 825 MW across three combined-cycle groups and serves as one of EDP's principal thermal generation assets in the Spanish electricity market. In the context of the April 2025 Iberian blackout investigation, EDP stated that Soto de Ribera "was not even scheduled to be operating" at the time the blackout occurred, forming the basis of EDP's denial of any causal responsibility .
The Soto de Ribera plant began operations in the 1990s and has been progressively expanded and upgraded with combined-cycle units. Asturias, a former coal-mining region in northern Spain, has transitioned towards gas-fired generation as part of Spain's coal phase-out programme. The plant connects to Spain's transmission grid and its despatch status on any given day determines whether it contributes to frequency regulation and reserve capacity.
Soto de Ribera's alleged offline status at the time of the April 2025 blackout is central to EDP's legal position before CNMC. Grid despatch logs, which are retained and auditable, will determine whether the plant's non-operation exacerbated the blackout cascade or whether EDP's denial holds. CNMC's 9-18 month proceedings will include review of the historical despatch records for every named generation asset, including Soto de Ribera.