New: intraday auctions · wind & solar forecasts · the free live map

Europe's power market.
Decoded for energy traders

Prices, forecasts, weather stations, imbalance, flows and outages — 43 zones, 15-minute native, six in-house Volt models, one API, a free live map and a trading desk. And one promise nobody else makes: 17% less forecast error than the free baseline — or your zone is free. Scored in public, daily.

Get my free API key → See the trading desk

30 seconds · no credit card · free zone forever · paid plans from €9/mo

−17%

forecast error vs baseline

43

bidding zones

<60s

auction webhook

DE-LU · day-ahead

15-minute periods · EUR/MWh

LIVE FEED
published price P50 forecast P10–P90
SMARD.de · CC BY 4.0

What was smart timing worth last month?

Real day-ahead prices, last 30 days — not a hypothetical. Pick your zone:

Savings, last 30 days

…

Computing from realized prices…

≈ …/year

Start capturing this →

Why now · why Voltcast

One platform.
Every angle of the energy transition.

Europe's grid got complicated fast — 15-minute markets, negative prices, weather-driven everything. The data to navigate it was split between hobby feeds and €3,500+/yr exchange licenses. We rebuilt the whole stack, then kept going.

GET /v1/forecasts/DE-LU?horizon=48h&quantiles=10,50,90 
{
  "zone": "DE-LU",
  "model_version": "volt-2026.07.10",
  "accuracy": "https://voltcast.com/accuracy/DE-LU",
  "curve": [
    { "start": "2026-07-11T11:00:00Z",
      "resolution_flag": "PT15M",
      "p10": 41.20,
      "p50": 58.75,
      "p90": 84.10 },
    ...
  ]
}

Probabilistic forecasts

Not a point guess.
A P10–P90 distribution you can schedule against.

Per-zone gradient-boosted quantile models, retrained daily after the auction on load forecasts, wind & solar generation forecasts, weather and calendar structure. Horizons from 1 hour to 7 days, evaluated strictly walk-forward — no lookahead, ever.

  • ✓ Quantiles feed risk-aware EV charging, battery dispatch and tariff hedging
  • ✓ Optimization endpoints turn the curve into cheapest-window and charge schedules
  • ✓ Every response links to that zone's live accuracy record

The engine

Meet Volt.

Every forecast on this platform — prices, wind & solar, intraday spreads, imbalance, negative-price risk — comes from one in-house model family, trained on our own recorders and scored in public every single day. No vendored black boxes. No borrowed numbers. Ours.

VOLT 1

calendar + lags

Superseded
→

VOLT 2

+ weather

Superseded
→

VOLT 3

+ grid drivers

Serving
→

VOLT 4

+ TSO grid forecasts

Live in production
→

VOLT 5

stacked ensemble + conformal

In training

A generation ships only when it beats the one before it on the public scoreboard — walk-forward, no lookahead, losses included.

VOLT 4

Price forecasts

P10/P50/P90 day-ahead curves, 1h–7d, every zone. The flagship — up to a third less error than the naive baseline where it serves.

Volt 5 successor in training →

VOLT RES 1

Wind & solar

Our own generation forecasts, scored head-to-head against the TSO's official forecast in every API response. Wins and losses both published.

vs the TSO, daily →

VOLT SPREAD 1

Intraday spreads

Predicts tomorrow's IDA1−DA spread per 15-minute slot, issued before the intraday gate closes — forward-blind by construction.

pre-IDA1 gate →

VOLT RISK 1

Negative prices

P(price < 0) per period, 14 days out, Brier-scored daily against climatology. The tracker's forward view.

Brier-scored →

VOLT TEMP 1

Temperature

Probabilistic daily Tmax/Tmin on the exact stations markets and CME weather contracts settle on — full distributions, 1°C buckets, verified vs METAR daily.

station-exact, CRPS-scored →

The whole family, one API call away. Full quantiles, wind & solar and optimization start at €199/mo — and if Volt doesn't beat the free baseline in your zone, that zone costs you nothing.

Put Volt to work → Audit it first

New · Quant tier

The Voltcast Desk.
Your market in one screen.

A real-time decision workspace fusing auctions, intraday, imbalance, outages, weather stations and every Volt model — with the data's age and the models' verified error bars on every tile. Event tape with measured publication latencies. Run drift showing what changed overnight. Four persona presets, ⌘K command palette, your layout saved.

  • → Energy trading · weather markets · hedge · parametric desks
  • → The only desk that tells you when NOT to trust it
Try the live demo — free → Go live with Quant

Demo shows the full desk on yesterday's data — no login needed.

The Voltcast Desk: zone board, event tape, auction clock, station desk and degree-day panels on one dark real-time screen

The scorecard

We publish our accuracy daily.
Even when it embarrasses us.

Pinball loss and MAE per zone and horizon, versus naive persistence and public free models — recomputed every day, in the open. You will never find a static accuracy claim on this site; the live page is the claim.

IE-SEM · day-ahead

−33.4%

error vs free baseline
MAE 26.76 vs 40.2 €/MWh

view the full record →

DE-LU · day-ahead

−31.0%

error vs free baseline
MAE 23.91 vs 34.64 €/MWh

view the full record →

EE · day-ahead

−27.8%

error vs free baseline
MAE 35.24 vs 48.8 €/MWh

view the full record →

Live numbers from the scorecard — walk-forward backtest until live evaluations accumulate, recomputed continuously.

The standing offer

If our forecast doesn't beat the free baseline in your zone, you don't pay for it. Zone-level credits, automatic, no support ticket required.

Developer-first

Three lines to your first price curve 

# 15-minute day-ahead prices, DE-LU, native resolution
curl -H "Authorization: Bearer $VOLTCAST_KEY" \
  "https://api.voltcast.com/v1/prices/DE-LU?from=2026-07-10&to=2026-07-12"
▸

Webhooks: auction_published, price_below, negative_prices — HMAC-signed, exponential retries

▸

Optimization: cheapest-window & EV/battery charge schedules straight from the forecast curve

▸

Bulk export: parquet/CSV, signed URLs, zero egress fees — your models, your data

▸

Ecosystem: Python & TypeScript SDKs, Home Assistant component, evcc tariff provider

▸

Grid & carbon: load, generation mix and carbon intensity + green score per 15-minute period — charge when it's greenest, not just cheapest

▸

AI agents: native MCP server — plug Voltcast into Claude, Cursor or your own agents in one config block

▸

Batteries & flex: FCR/aFRR/mFRR reserve prices, outage alerts, and a battery arbitrage backtest against real history

▸

Everywhere you work: Grafana, n8n, Google Sheets, a free embeddable price widget, and monthly market reports

Pricing

Self-serve. No sales calls. Annual −15%.

Free

€0

non-commercial · no card

  • 1 bidding zone (DE-LU)
  • 48h P50 forecast
  • 7 days of history
  • Load, generation & carbon
  • MCP server for AI agents
Start free now

Home

€9/mo

Home Assistant · evcc · hobby

  • Everything in Free
  • 1 zone, your choice
  • 7-day P50 forecast
  • 90 days of history
  • Carbon & green score
  • Daily zone briefing
  • 1 webhook rule
Start with Home

Starter

€49/mo

commercial use

  • Everything in Home
  • All 43 zones
  • 7-day P50 forecast
  • 1 year of history
  • Load, generation & carbon
  • 3 webhook rules
Start with Starter
Most popular

Pro

€199/mo

99.9% SLA

Subscribe to Pro

Scale

€499/mo

invoice · DPA · procurement

Subscribe to Scale Procurement or custom needs? Talk to us →

Balancing €299/mo

The full balancing dataset for BESS & flexibility desks: reBAP + 6 more imbalance markets (revision-aware), FCR/aFRR/mFRR reserve prices, outages, imbalance forecasts, wind/solar forecasts + weather, zone temperature, the ML intraday-spread forecast (volt-spread-1), and bulk CSV/Parquet export.

Subscribe →

Volt Temp €99/mo

Station-exact temperature for market & hedging desks: probabilistic daily Tmax/Tmin in 1°C buckets on the exact gauges markets settle on (Paris = Le Bourget), CME-city degree-day trackers with settle projections, population-weighted zone temperature, and station-integrity monitoring. Verified daily, losses included.

Subscribe →

Quant €999/mo

For teams training their own models: the Voltcast Desk (real-time multi-panel workspace), point-in-time-correct ML feature matrices — the exact training data our forecasts eat, anti-lookahead semantics documented per column — full-history training parquet exports, station temperature matrices, the as-of reconstruction API, and everything in Scale.

Subscribe →

Enterprise & custom

Multi-seat, SLA beyond Scale, battery revenue underwriting, custom zones or redistribution licensing — talk to a human, get an answer the same day.

Talk to sales →

Your first API call is
two minutes away.

Free key, no card. Every plan is self-serve — subscribe, upgrade or cancel from the dashboard. And every forecast we sell is scored publicly, every day, on /accuracy.

Get a free API key → Read the docs

Secure payment via Stripe · annual −15% · cancel any time