half a billion voluntary observations "by more than 10,000 citizen scientists worldwide" contributed as of August 2017, and Open Energy Monitor's success is another positive indicator, the people involved are probably overwhelmingly "STEM" (Science Technology Engineering Mathematics) friendly and positively happy with numbers and tech. The question remains about how to actively and positively involve people with IoT for whom STEM is not in their comfort zone.
This issue bears some resemblance (for good reason) to the work in "EGC: HaaS Lite WP1 D15 Customer Research", which in part is getting people to positively engage just enough with smart tech that will save them piles of money (and carbon) and have those interactions and savings persist. It may be much more about smiley faces than numbers and graphs in the long run. The sort of "soft" stuff that makes many STEM-lovers cringe; we'll have to find out!