2026-08-11Updated 2026-09-08BESS

Portuguese BESS spread hits €185.56/MWh, 99th percentile of 733-week history

The 7-day mean daily spread in the PT zone reached €185.56/MWh on 2026-08-10, nearly double its long-run baseline.

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

Key takeaways

The 7-day mean daily spread ending 2026-08-10 was €185.56/MWh, a z-score of 3.26 against a 733-observation sample and the 99.3rd percentile of the distribution.
This is 98.6% above the long-run baseline of €93.45/MWh, the widest spread regime recorded in the PT zone's tracked history.
Within W32, the single-day maximum price reached €215.13/MWh on 2026-08-07; the daily minimum touched -€0.1/MWh on 2026-08-09, producing a single-day range of €207.38/MWh.
Solar's share of generation fell 16.4 percentage points year-on-year to 25.8%, while hydro reservoirs sat 13.1% below the 3-year norm, tightening afternoon supply.
The PT week mean of €121.44/MWh sits 76.3% above the same week last year (€68.88/MWh), ranking 9th of 19 tracked zones by absolute level.
DE, ES, and PT all posted mean daily spreads above €176/MWh in W32, signalling that the wide-spread regime is not Portugal-specific this week.

The 7-day mean daily spread in the Portuguese zone reached €185.56/MWh in the window ending 2026-08-10, placing it at the 99.3rd percentile of a 733-observation distribution with a z-score of 3.26. The long-run baseline for this metric is €93.45/MWh; the current reading is 98.6% above it. This is a severity-5 event by Vantage's grading scale, the highest tier.

Photo by Hilary Halliwell on Pexels.

Discussion (0)

Plain text only. Be civil. Verifiable industry affiliations are coming.

Loading…