2026-08-17BESS

Spanish BESS spread hits 99.9th percentile in W31 2026

The 7-day mean daily spread in the ES zone reached €178.8/MWh: 87.6% above the 733-day baseline of €95.3/MWh and a z-score of 3.29.

By Matthias Blank · drafted with the Vantage newsroom system, approved before publication

Key takeaways

ES 7-day mean daily spread: €178.8/MWh: 99.9th percentile of the 733-day distribution, z-score 3.29, baseline €95.3/MWh.
Week mean price €119.91/MWh is 177% above the same week last year (€43.28/MWh), the second-largest YoY jump in the tracked region behind PT at +179.3%.
Wind supplied 11.4% of ES generation this week versus 28.5% in the same week last year, a 17.1-percentage-point collapse that tightened dispatchable supply.
Daily spreads peaked at €237.33/MWh on 2026-07-27, with a single-day low of −€2.69/MWh on 2026-08-02, confirming the within-day amplitude that BESS arbitrage targets.
ES ranked first for daily spread mean (€194.45/MWh) across all 18 tracked zones, ahead of DE (€193.28/MWh) and PT (€192.19/MWh).
Load ran +13.3% year-on-year while planned outages totalled 48,513 MW-days, compressing available headroom between peak and off-peak prices further.

The ES zone's 7-day mean daily spread centred on 2026-08-03 reached €178.8/MWh: 87.6% above the 733-day rolling baseline of €95.3/MWh, landing at the 99.9th percentile of that distribution with a z-score of 3.29. The window runs from 2026-07-28 through 2026-08-03.

Photo by Castorly Stock on Pexels.

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