In 2013 a paper was written about some platform for a data economy for energy efficiency data, named OpenFridge. The paper describes a "preliminary architecture that integrates Big Data and semantic overlay components, developed in the project OpenFridge with the goal to create data economy for energy efficiency information".
In my opinion they forgot the most important ingredient for the community: Data Crowdselling! A direct incentive for community members (or Data Union participants ;-)) for sharing their data.
Interestingly, I also found a Github repository from IBM, which also goes into the same kind of data economy: https://github.com/IBM/ibm-cloud-functions-serverless-iot-openfridge
The repository is not maintained or updated anymore and read-only. Again, I think they missed the data crowdselling part.
Anyways, I came across this article and the github repository and it mentoined smart meters, so I thought I just share it here again. Hopefully we will have an OpenFridge Data Union sooner rather than later.