Hi everyone,
I built a small free forecast service that can be used from Home Assistant via REST sensors.
It provides:
- electricity price forecasts
- CO2 forecasts in gCO2/kWh
- cheapest time windows
- lowest-CO2 time windows
- a combined price + CO2 recommendation
The main use case is flexible consumption: EV charging, heat pumps, boilers, batteries or other loads that can be shifted by a few hours.
Docs and YAML examples:
API example:
https://stroomprijsprognose.nl/api/v1/home-assistant/summary?country=de
Currently supported markets:
DE, NL, BE, DK1 and DK2.
A note on the CO2 values:
The CO2 value is an estimated consumption-based CO2e intensity per consumed kWh, including import effects. It is meant for timing decisions, not as an official emissions inventory.
Forecast quality:
The web app also shows recent forecast quality metrics, comparing recent forecasts with later known values. This should help you judge whether the data is good enough for your automation.
This is not an official Home Assistant integration yet. It is just a simple REST endpoint that can be used with Home Assistant’s built-in REST integration.
I would be very interested in feedback from Home Assistant users:
- Is the JSON structure useful?
- Are the suggested sensors practical?
- Would a blueprint or HACS integration be helpful?
- Which additional fields would make automations easier?
Thanks!