[UoM] Add dimension for emission intensity

[jlaur]

This adds a dimension that can be used to express emission rate of a given pollutant relative to the intensity of a specific activity, for example CO2 emissions in g/kWh (mass/energy). See https://en.wikipedia.org/wiki/Emission_intensity.

This is a preparation to support UoM for new datasets in the Energi Data Service binding:

[J-N-K]

I'm not against this, but what is the use-case for this in the smart-home context? Is there any service that provides live emission data for the current power generation?

[jlaur]

I'm not against this, but what is the use-case for this in the smart-home context? Is there any service that provides live emission data for the current power generation?

Yes, there is a dataset for near up-to-date history for CO2 emission as well as an estimated prognosis (like shown in the graph in the PR description). The prognosis is particularly interesting because it follows the day-ahead market and is continuously updated.

So far I have been using prices for planning consumption, as an approximation for when the energy is "greenest". But making CO₂ emission data available can allow for more fine-grained planning when the objective is not only to consider economy. Or even just to plot on a graph combined with prices to give overview/insights.

Adding UoM support for this is of course not needed, just nice to have. 🙂

[J-N-K]

Thanks!

[jlaur]

@openhab/core-maintainers - can you add the "4.2" milestone?