PowerLight

Project PowerLight
Show energy mix of dutch power generation as a pie chart on a LED ring
Status	In progress
Contact	bertrik
Last Update	2022-07-13

The concept

Draw the current power generation-mix as a kind of pie chart on a LED ring light, with colors representing a fraction of a specific power generation source.

For example:

• blue: wind power
• yellow: solar power see below
• green: power from biomass see below
• purple: power from nuclear
• red: fossil
• grey: other

Power generation data

Information about energy in Europe is collected at the european organisation ENTSO. The section about electrical energy is collected in ENTSO-E. Data is available from this platform at a 15-minute interval.

TenneT is the organisation that supplies ENTSO-E with data from the Netherlands.

The solar power problem

In particular the solar power fraction is incomplete, but also the biomass figures are missing. See:

• https://berthub.eu/articles/posts/dutch-electrical-power-figures-2/ (text)
• https://energy-charts.info/charts/energy_pie/chart.htm?l=en&c=NL note how the solar part is tiny

There is a model to estimate this fraction at https://api.netanders.io/, however you cannot use this API without a key (and you can't just get a key).

Some ideas to fix this gap somewhat:

• Correlate official reported solar data with the model, and extract a kind of tennet-reported->best-guess-actual multiplication factor
• Use yesterday's solar prediction data from ENTSO-E. The number seen here seems to correlate reasonably well with the number shown at https://energieopwek.nl/ (which bases itself on the netanders model)

Information about ENTSO-E generation domain API: https://transparency.entsoe.eu/content/static_content/Static%20content/web%20api/Guide.html#_generation_domain

Hardware

Parts:

• LED ring light https://nl.aliexpress.com/item/1005003798658173.html
• Wemos D1 mini with an ESP8266

Software

The software consists of two parts:

• backend part that collects the power generation data
• light part that visualizes the power generation as fractions on a LED ring

Backend

Source code: https://github.com/bertrik/energymix-server

In progress, run as a REST-like resource at http://stofradar.nl:9001/energy/latest (1-minute rate limit)

Returns a JSON-structure like:

{
  "time": 1657057500,
  "total": 9122,
  "mix": [
    { "id": "solar", "power": 0, "color": "#FFFF00"},
    { "id": "wind", "power": 4, "color": "#0000FF"},
    { "id": "fossil", "power": 86, "color": "#FF0000"},
    { "id": "nuclear", "power": 5, "color": "#FF00FF"},
    { "id": "other", "power": 4, "color": "#444444"},
    { "id": "waste", "power": 1, "color": "#444444"}
  ]
}

• time is a unix time stamp in seconds, representing the end of the 15-minute period that the power figures refer to
• total is the total current electrical power (megawatt), suitable for display (on a numeric display inside the ring for example)
• energymix is an array of power sources, each with:
  • a short unique id
  • most recent known power (megawatt)
  • hex color, for display on the led ring

Light

Source code: https://github.com/bertrik/PowerLight