Would be interested in seeing the product you refer to. Also, this isn't a concept. A working proto is in our lab.
There is a color aspect to this device also. The company is working on the algorithm for it so we can't really be too sure how it will be implemented in its final form.
As of right now, as you said, Green is "good" red is "bad".
But if you think about it, How do you gauge your house's good from bad on day one? It is a constantly changing number. It may be red during the day but green at night. Do you take an average? Statistically, over time, that average will flatten out.
Having no interface at all would be challenging, at best, considering all the different factors that play into the localization of each product. Rates are different in BC from Ontario, for example. Ontario has a handful of different power companies, while BC has one.
We've done what we can to simplify it down as much as possible. At the end of the day, its their S/W group that will make this thing sing and dance.