Home Assistant has great energy management features. ESPHome provides easy and cheap way to get various measurements into Home Assistant. Combine the two and you can start tracking gas usage at homes that have old style gas meters.
Hey, how are you doing? (: Since there was a week between the end of the GSoC and the start of my studies, I decided to do some hobby hacking.
I have some remote (50 km away) appliances (electric heater) that I would like to control from wherever I am. The SMS service is a very compelling solution for this kind of problem. The main challenge is to figure out how to make a mobile phone to a relay that can switch on and off things.