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Besós and San Roque: same owners, opposite outcomes
Two Spanish CCGT complexes share the same Endesa/Naturgy ownership split — and produce opposite results under Operación Reforzada. In Barcelona, Naturgy's unit wins; in Cádiz, Endesa's dominates. The difference is geography: mixed clusters reward the operator, uniform clusters reward the location.
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Who pockets the hidden RT3 cost: €3,900M of pay-as-bid concentrated in 5 utilities
Twelve months after the Iberian blackout, the pay-as-bid Spain pays its CCGT fleet for solving day-ahead technical constraints (consumer-side RT3) is €3,870M per year. Three groups absorb 62% of the flow. Iberdrola is the marginal winner (+€152M post vs pre); Endesa, the only major loser (-€100M).
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Operación Reforzada at unit level: which CCGTs win and lose the redispatch
Drilldown to the plant level: post-blackout pay-as-bid for solving technical constraints does not reward all combined-cycles equally. Within the Besós complex in Barcelona, unit 4 (Naturgy) gains €28M while unit 5 (Endesa) loses €71M — same site, two owners, opposite trajectories. The cluster pattern: south (Cádiz/Huelva) all winners, north interior all winners, Mediterranean coast and SE mixed.
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RT3, the hidden cost of integrating renewables in Spain's grid: ×10 since 2020
Spain's technical-constraints cost (compodem RT3) has multiplied tenfold since 2020. Quantitative analysis over 148 months: Pearson correlation +0.76 with the share of variable generation (PV + wind), controlled for OMIE wholesale price. Corroborated by PwC's February 2026 report on the post-blackout Reinforced Operation.
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12 months after the Iberian blackout: the system absorbs the same, pays differently
365-day pre vs 365-day post-blackout comparison across five dimensions: the Iberian power system absorbs the same renewable share, but the cost of technical constraints (compodem RT3) has multiplied by 2.5 and negative-price hours by 4.4 — driven by REE's post-blackout Reinforced Operation.
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