I-SEM Daily Briefing — 12 August 2026
Table of Contents
Market Snapshot
| Metric | Value |
|---|---|
| Mean DAM Price | €171.8/MWh |
| Median Price | €153.91/MWh |
| Std Dev | €47.26/MWh |
| Peak Price | €276.75/MWh (19:00) |
| Min Price | €128.17/MWh (15:00) |
| Price Range | €148.58/MWh |
| Periods above €150 | 27 of 48 (56%) |
| Periods above €200 | 11 of 48 (23%) |
| Peak Avg (07–22) | €178.3/MWh |
| Off-peak Avg (22–07) | €160.98/MWh |
| Peak/Off-Peak Spread | €17.32/MWh |
| Wind % of Demand | 19.2% |
| Wind Range | 6.8%–36.8% |
| Mean Demand | 3952 MW |
Price Profile #
Std dev €47.26/MWh · Median €153.91/MWh · Periods above €150: 27 of 48 (56%)
Price vs Wind #
Mean wind: 19.2% · Range: 6.8%–36.8%
Week in Context #
Price Duration Curve #
Periods above €150: 27 (56% of day) · Above €200: 11 (23% of day)
Peak / Off-Peak Spread #
Peak avg (07:00–22:00): €178.3/MWh · Off-peak avg: €160.98/MWh · Spread: €17.32/MWh
BESS Dispatch Signal #
| Price | Time | Energy | Value | |
|---|---|---|---|---|
| Charge | €130/MWh | 11:00 | 2 MWh | −€260 |
| Discharge | €269/MWh | 18:30 | 1.7 MWh (85% RTE) | +€458 |
| Gross profit | €198 | |||
| Price spread | €139/MWh | ROI: 76.2% |
Simulated 1MW/2MWh battery, one optimal DAM cycle. Gross before network charges and capacity costs.
Commentary #
Wednesday broke Tuesday’s flatness wide open. Std dev jumped to €47.26 as a moderate 19.2% wind day (6.8–36.8% range) gave way to a classic evening scarcity ramp: a soft €128.17 trough at 15:00 running into a €276.75 peak just four hours later at 19:00, a €148.58 top-to-bottom range. Eleven of forty-eight periods cleared above €200 — the floor stayed gas-set through the afternoon, the ceiling opened up once wind eased into the evening squeeze.
Storage cashed in on exactly that shape: charge at the 11:00 €130 trough, discharge into the 18:30 ramp at €269, for €198 gross and a 76.2% ROI — comfortably the best return since Tuesday’s near-zero spread. The lesson from Tuesday holds in reverse: give storage a real peak to sell into, and the numbers move.
Half-hourly data — 2026-08-12
| Period | Time | Price (€/MWh) | Wind % |
|---|---|---|---|
| 1 | 23:00 | 160.18 | 7.0% |
| 2 | 23:30 | 154.89 | 6.8% |
| 3 | 00:00 | 152.94 | 34.4% |
| 4 | 00:30 | 150.30 | 35.5% |
| 5 | 01:00 | 144.20 | 36.8% |
| 6 | 01:30 | 142.23 | 35.6% |
| 7 | 02:00 | 143.98 | 34.1% |
| 8 | 02:30 | 142.02 | 34.9% |
| 9 | 03:00 | 141.10 | 33.9% |
| 10 | 03:30 | 141.17 | 32.9% |
| 11 | 04:00 | 145.77 | 33.1% |
| 12 | 04:30 | 146.97 | 32.6% |
| 13 | 05:00 | 155.00 | 32.5% |
| 14 | 05:30 | 159.25 | 31.8% |
| 15 | 06:00 | 163.70 | 28.5% |
| 16 | 06:30 | 169.98 | 27.4% |
| 17 | 07:00 | 176.00 | 24.4% |
| 18 | 07:30 | 178.64 | 22.3% |
| 19 | 08:00 | 157.68 | 20.1% |
| 20 | 08:30 | 165.90 | 19.5% |
| 21 | 09:00 | 152.68 | 16.7% |
| 22 | 09:30 | 147.09 | 15.9% |
| 23 | 10:00 | 136.51 | 15.9% |
| 24 | 10:30 | 133.56 | 15.2% |
| 25 | 11:00 | 131.20 | 14.9% |
| 26 | 11:30 | 129.88 | 14.4% |
| 27 | 12:00 | 129.88 | 15.6% |
| 28 | 12:30 | 128.56 | 16.2% |
| 29 | 13:00 | 133.56 | 15.0% |
| 30 | 13:30 | 132.00 | 15.1% |
| 31 | 14:00 | 131.80 | 14.0% |
| 32 | 14:30 | 131.11 | 15.2% |
| 33 | 15:00 | 128.17 | 15.9% |
| 34 | 15:30 | 128.56 | 15.5% |
| 35 | 16:00 | 155.97 | 14.6% |
| 36 | 16:30 | 163.30 | 12.6% |
| 37 | 17:00 | 190.05 | 13.0% |
| 38 | 17:30 | 201.00 | 11.5% |
| 39 | 18:00 | 251.00 | 11.2% |
| 40 | 18:30 | 270.88 | 10.3% |
| 41 | 19:00 | 276.75 | 9.2% |
| 42 | 19:30 | 265.00 | 8.5% |
| 43 | 20:00 | 264.56 | 7.9% |
| 44 | 20:30 | 262.10 | 7.4% |
| 45 | 21:00 | 252.62 | 8.6% |
| 46 | 21:30 | 243.00 | 8.2% |
| 47 | 22:00 | 251.00 | 8.5% |
| 48 | 22:30 | 232.95 | 8.4% |
For the week-level picture and what it means if you're buying, see Weekly Analysis — 10–16 August 2026.
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