I-SEM Daily Briefing — 20 August 2026

Price Profile #

Std dev €21.59/MWh · Median €164.58/MWh · Periods above €150: 35 of 48 (73%)

Week in Context #

Price Duration Curve #

Periods above €150: 35 (73% of day) · Above €200: 4 (8% of day)

Peak / Off-Peak Spread #

Peak avg (07:00–22:00): €167.13/MWh · Off-peak avg: €169.31/MWh · Spread: €-2.18/MWh

BESS Dispatch Signal #

Simulated 1MW/2MWh battery, one optimal DAM cycle. Gross before network charges and capacity costs.

Commentary #

Thursday traced the usual midday-dip, evening-climb shape — down to a €140.56 floor at 15:00, up to €203.17 by 20:30 — but the wind feed didn’t come through today, so this one’s price-only. What we do have is wind in raw MW: it held above 1,400MW for most of the morning and only fell away after 19:00, right as the evening price started climbing, which is at least a plausible driver even without demand to turn it into a clean percentage. The odd number of the day was a slightly negative peak/off-peak spread (€-2.18) — overnight hours stayed elevated enough (€187.87 at 23:00, still €173 by midnight) to outweigh the midday trough within the 07:00–22:00 window, so “peak” hours actually averaged a touch below “off-peak.”

Storage read the shape correctly: charged into the 14:00 trough at €141, discharged at 19:00 for €202 — a little ahead of the actual 20:30 high, so it left something on the table, but still banked €60 gross for 21.3% ROI, solidly mid-pack.

For the week-level picture and what it means if you're buying, see Weekly Analysis — 10–16 August 2026.