I-SEM Daily Briefing — 21 August 2026

Price Profile #

Std dev €20.95/MWh · Median €168.64/MWh · Periods above €150: 48 of 48 (100%)

Price vs Wind #

Mean wind: 21.4% · Range: 12.4%–27.9%

Week in Context #

Price Duration Curve #

Periods above €150: 48 (100% of day) · Above €200: 11 (23% of day)

Peak / Off-Peak Spread #

Peak avg (07:00–22:00): €176.9/MWh · Off-peak avg: €172.93/MWh · Spread: €3.97/MWh

BESS Dispatch Signal #

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

Commentary #

Friday’s low point was a genuine morning squeeze: wind fell from 17.8% to 12.4% between 07:00 and 08:30, and price spiked to €205.04 right in the middle of it — the day’s second-highest reading, beaten only by the evening. Wind recovered steadily through the afternoon, touching a 27.9% high at 17:00, and held above 20% for the rest of the evening — but that didn’t stop price climbing to a €213.08 peak at 21:00 anyway. Demand was doing the driving this time, not wind: every single half-hour period cleared €150 today, the tightest floor of the run, with a €152.73 minimum.

Storage charged at 11:30 (€154) and discharged at 20:00 (€210) — a fine trade, but the weakest return of the week at €49 gross, 15.9% ROI. With wind sitting above 20% for most of the afternoon and evening, there wasn’t much of a trough-to-peak spread left for the battery to work with.

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