Daily guide · FR · 2026-08-10

Negative-price watch France: this week's floor, and what's ahead

All numbers computed from the week's published auction results at publication and frozen — this article is an honest snapshot, not a page that rewrites itself. Reproduce via the API.

This week's floor in France landed at -6,67 EUR/MWh, reached at hour 13 on 8 August 2026. The midday timing is familiar: solar output peaks while demand stays subdued, and the price briefly turns negative. Across the week there were 11 negative hours, with a wider band of 26 hours priced below 10 EUR/MWh. That combination tells you the soft-price pressure is broad rather than confined to a single deep dip.

For readers, the signal is one of persistent daytime weakness rather than a sharp anomaly. The year-to-date count now stands at 2.367 negative periods, so France remains firmly in a high-frequency negative-price regime. The modelled probability of a negative print over the next seven days sits at 0,08, which points to limited but non-trivial risk of a repeat.

The concrete takeaway: treat the midday window around hour 13 as the exposure point. With a 0,08 seven-day probability and 26 sub-10 EUR/MWh hours already logged this week, positioning for soft afternoon prices is more defensible than betting on a firm floor.

When wind and solar produce more than a zone can consume or export, the day-ahead auction clears below zero — producers literally pay consumers to take power. Negative prices went from curiosity to structural feature across Europe, and for anyone with flexible load or storage they're the most interesting hours of the year. Here's where FR stands.

-6.67

this week's floor (€/MWh), 2026-08-08 at 13:00 local

11 / 26

hours below €0 / below €10 this week

2,367

negative delivery periods in 2026 so far (FR)

The forward view

Our negative-price risk model (Brier-scored daily against climatology — record on /accuracy) currently puts the peak probability of a sub-zero period in FR over the next 7 days at 8%. That number updates daily via GET /v1/risk/negative/FR — a 14-day calendar of per-15-minute probabilities.

Never miss one again

The useful pattern isn't watching a dashboard — it's a webhook that fires when tomorrow's auction clears negative anywhere in your zone:

curl -X POST -H "Authorization: Bearer YOUR_KEY" \
  -H "Content-Type: application/json" \
  -d '{"event": "negative_prices", "zone": "FR", "url": "https://your-app/hook"}' \
  https://voltcast.com/api/v1/webhooks

It delivers seconds after the 13:00 CET publication, HMAC-signed. Journalists and analysts: the live FR tracker has the all-time records, monthly history and a CSV download — free to cite with attribution. For the systematic view (which hours, which seasons, how deep), the full 2015+ archive is one bulk export away.

Live FR prices → All daily guides → Start with Home →

Method & citation. Prices are hourly means of published day-ahead auction results (native 15-minute periods averaged; ENTSO-E/SMARD, attributed). Wholesale-price component only — grid fees and taxes come on top and vary by supplier. Cite as "Voltcast Research, voltcast.com/guides/negative-watch-fr-2026-08-10".

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