Hello @gizmocuz.
I had a quick look to the links you provided.
No 1 (Nowtricity)
This site gives more or less the same data as "Electricity Maps" but some essential data is missing.
I think the site is somewhat easier to read. I don't see anything about "Open Source".
Both have an API and the API of Nowtricity gives you more history (monthly/yearly)
The percentage of fossil-free or renewable energy is missing, so that cannot be calculated from their site.
The history can easily be managed by Domoticz, but the missing percentage is worse.
I think this makes that site less useful.
No 2 (H2 IQ)
This site has a nice online calculation tool , but I don't see anything that looks like an API.
So interfacing with Home Automation systems will be more difficult.
No 3 (Cencepower)
This site will give you the formula's to be able to calculate the emission.
In fact, there is very few information and also an API is missing.
You have to fill in a web formulae and it will give you the emission.
No 4 (Green Clean Guide)
I think this site has its origin in India. I gives you some information about ISO 14064.
But their approach is different from my goal
I want to know what the current footprint is, if I consume electricity from the grid.
They summarize all energy (electricity, diesel, petrol, LPG) and calculate your personal carbon footprint.
This data is from the past, so it is historical data.
The question is also, how to collect this data in your Home Automation system?
I think that an offline approach and calculating this internally would be great if that was possible
Of course , that would be nice, but I don't think that that is possible. You have to collect the percentage or the break down of the various source, like solar, wind , nuclear, hydro, etc to be able to calculate it.
No 1 (Nowtricity) does not provide that data, while the other 3 have no API.
I don't know another method to get the data into Domoticz.
Regards