For electricity monitoring I would definitely recommend installing your own monitoring system. I have the Iotawatt which works pretty well, but if I was going to buy another I would go with the Emporia Vue and flash it with ESPhome. That way you can get live data on your energy use and also monitor directly any major loads.
I’m currently using Emporia Vue and love it, but haven’t flashed it to ESPHome yet. Still using the cloud.
With regards to the green button, that would not be instant date, it’s more for analyzing the usage at the end of the month from what I understand .
Now if they provide an API with instant data access that’s another story.
i just installed emporia vue flashed with esphome, installation was straight forward and everything went fine, really loving the monitoring it’s great to know exactly how much in and out from grid…
don’t think they can provide instant data access via green button right? don’t they still have to read the meter by driving by? and if it’s enbridge they literally manually read the meter with their eyes lol
At least in Ottawa, the data is sent by radio for electricity and water. So the green button data is relatively up to date. Really hoping for a solution to consume the green button data.
As for Enbridge, they have been asking client to read their own meter and report the results online 
I solved this issue by converting every gas appliance in my home to electricity and cancelling my natural gas service. Maybe a little extreme but at least now I can actually track my energy use.
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The following seems to work pretty well with my Enbridge gas meter and the cost to implement the sensor is not too expensive. Works well on water meter in Toronto as well (Neptune N10).
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Were you able to get the green button xml data into HA?