I-SEM Daily Briefing — 28 September 2026
Table of Contents
Market Snapshot
| Metric | Value |
|---|---|
| Mean DAM Price | €209.05/MWh |
| Median Price | €197.73/MWh |
| Std Dev | €41.72/MWh |
| Peak Price | €298.59/MWh (18:30) |
| Min Price | €161.23/MWh (13:30) |
| Price Range | €137.36/MWh |
| Periods above €150 | 48 of 48 (100%) |
| Periods above €200 | 23 of 48 (48%) |
| Peak Avg (07–22) | €220.78/MWh |
| Off-peak Avg (22–07) | €189.48/MWh |
| Peak/Off-Peak Spread | €31.3/MWh |
| Cheap/Dear Spread | €163.39/MWh → €293.52/MWh (€130.13) |
| Wind % of Demand | 32.0% |
| Wind Range | 13.7%–67.3% |
| Mean Demand | 3948 MW |
Price Profile #
Std dev €41.72/MWh · Median €197.73/MWh · Periods above €150: 48 of 48 (100%)
Price vs Wind #
Mean wind: 32.0% · Range: 13.7%–67.3%
Week in Context #
Price Duration Curve #
Periods above €150: 48 (100% of day) · Above €200: 23 (48% of day)
Peak / Off-Peak Spread #
Peak avg (07:00–22:00): €220.78/MWh · Off-peak avg: €189.48/MWh · Spread: €31.3/MWh
Cheap window: €163.39/MWh · Dear window: €293.52/MWh · Spread: €130.13/MWh — the actual cheapest and dearest 2-hour blocks of the day, wherever they fall on the clock
Commentary #
Monday with low wind, and it looked like it. Mean of €209.05, every period above €150, nearly half of them above €200.
Wind was stuck under 20% from 07:00 to midday and the price hit €260.84 at 08:00. Midday only got as low as €161, no trough to speak of. The evening was the dearest block of the day: €284-€298.59 from 17:00 to 19:00, even as wind was recovering to 37%. Monday demand plus a slow wind recovery wasn’t enough to hold it down.
Wind finally hit 60%+ from 21:30 onwards and the price dropped below €200 at 22:00. If that holds overnight, Tuesday should look a lot more like last Thursday.
Half-hourly data — 2026-09-28
| Period | Time | Price (€/MWh) | Wind % |
|---|---|---|---|
| 1 | 23:00 | 191.15 | 67.3% |
| 2 | 23:30 | 172.50 | 65.8% |
| 3 | 00:00 | 169.90 | 23.7% |
| 4 | 00:30 | 168.14 | 25.3% |
| 5 | 01:00 | 170.02 | 26.6% |
| 6 | 01:30 | 168.95 | 27.1% |
| 7 | 02:00 | 176.02 | 27.8% |
| 8 | 02:30 | 178.10 | 24.8% |
| 9 | 03:00 | 180.06 | 25.8% |
| 10 | 03:30 | 180.02 | 23.9% |
| 11 | 04:00 | 186.40 | 23.2% |
| 12 | 04:30 | 187.26 | 25.7% |
| 13 | 05:00 | 207.55 | 27.6% |
| 14 | 05:30 | 210.87 | 25.4% |
| 15 | 06:00 | 230.00 | 22.5% |
| 16 | 06:30 | 243.20 | 21.7% |
| 17 | 07:00 | 242.43 | 19.9% |
| 18 | 07:30 | 252.32 | 19.2% |
| 19 | 08:00 | 260.84 | 18.4% |
| 20 | 08:30 | 258.97 | 18.5% |
| 21 | 09:00 | 235.00 | 17.1% |
| 22 | 09:30 | 214.08 | 16.2% |
| 23 | 10:00 | 200.60 | 15.6% |
| 24 | 10:30 | 180.30 | 15.3% |
| 25 | 11:00 | 164.79 | 13.7% |
| 26 | 11:30 | 165.00 | 16.1% |
| 27 | 12:00 | 164.79 | 17.1% |
| 28 | 12:30 | 164.79 | 19.8% |
| 29 | 13:00 | 162.75 | 24.2% |
| 30 | 13:30 | 161.23 | 27.2% |
| 31 | 14:00 | 168.71 | 31.6% |
| 32 | 14:30 | 171.26 | 35.8% |
| 33 | 15:00 | 187.44 | 36.4% |
| 34 | 15:30 | 196.02 | 38.8% |
| 35 | 16:00 | 225.00 | 38.8% |
| 36 | 16:30 | 233.65 | 36.2% |
| 37 | 17:00 | 284.00 | 36.0% |
| 38 | 17:30 | 294.41 | 36.6% |
| 39 | 18:00 | 297.08 | 37.2% |
| 40 | 18:30 | 298.59 | 37.5% |
| 41 | 19:00 | 284.00 | 39.1% |
| 42 | 19:30 | 279.60 | 43.1% |
| 43 | 20:00 | 237.64 | 47.6% |
| 44 | 20:30 | 228.34 | 52.8% |
| 45 | 21:00 | 207.18 | 56.3% |
| 46 | 21:30 | 202.71 | 60.6% |
| 47 | 22:00 | 199.44 | 62.3% |
| 48 | 22:30 | 191.12 | 65.2% |
For the week-level picture and what it means if you're buying, see Weekly Analysis — 28 September–4 October 2026.
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