Daily guide · RS · 2026-09-15

Negative-price watch Serbia: 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.

Serbia's week floor landed at 5,01 EUR/MWh on 9 September 2026, in hour 8. That is a low but firmly positive number, and it is the only hour this week to settle below 10 EUR/MWh. No hours cleared into negative territory, and the modelled maximum probability of a negative print over the next seven days sits at 0.

For a negative-watch reader, this is a quiet week. The single sub-10 hour signals where downward pressure is concentrated — the early morning, hour 8 — but it stopped well short of a floor breach. With 0 negative hours on the week and a 0 forward probability, there is no near-term case for pricing in negative-settlement risk in Serbia.

The context worth holding onto is the year-to-date count: 168 negative periods so far in 2026. That confirms negative pricing is a real feature of this market, even if it is absent this week. The concrete takeaway: treat the current calm as a pause, not a structural shift, and keep watching the morning hours where the 5,01 EUR/MWh floor formed.

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 RS stands.

5.01

this week's floor (€/MWh), 2026-09-09 at 08:00 local

0 / 1

hours below €0 / below €10 this week

168

negative delivery periods in 2026 so far (RS)

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 RS over the next 7 days at 0%. That number updates daily via GET /v1/risk/negative/RS — 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": "RS", "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 RS tracker has the all-time records, monthly history and a CSV download — free to cite with attribution. Home+ can download its entitled interval prices and forward risk directly to Excel from the API; the full 2015+ archive remains a Pro+ bulk export.

Live RS 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-rs-2026-09-15".

Next issue 2 Oct

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