Is there an existing mass-produced solution that can do it? The normal power line ethernet devices can handle ~300m and degrade quickly with noise. You'd need s

Is there an existing mass-produced solution that can do it? The normal power line ethernet devices can handle ~300m and degrade quickly with noise. You'd need something much more specialised to go low speed high distance and able to handle lots of unsynchronized devices on the same line. More common solutions installed in other places are dedicated mesh networks like Gridstream or AcuMesh. I'm really not sure why would the energy companies go for GSM instead. This is not just for the cities - Gridstream can reach a few km away. On the other hand here's a buzzword-heavy ad from Thales that pushes for GSM https://www.thalesgroup.com/en/markets/digital-identity-and-security/iot/industries/energy-utilities/cellular-iot https://www.thalesgroup.com/en/markets/digital-identity-and-... Edit: apparently the powerline based data exists in the wild. (Keyword: PLC, but it's only one-way) Here's an interesting report from an Australian provider https://www.aemc.gov.au/sites/default/files/content/1494afbe-7bca-477d-aae1-d6625d6559ef/Silver-Spring-Networks-received-22-October-2012.pdf https://www.aemc.gov.au/sites/default/files/content/1494afbe... 10 years ago they were 46% rf mesh, 39% powerline data, 0.1% GSM. It's hard to find something more recent, but local mobile telcos had a lot of announcements / ads in later years, so the trend may have moved as well... A decent global market overview from 2019 https://www.smart-energy.com/magazine-article/ami-penetration-and-communication-protocols/amp/ https://www.smart-energy.com/magazine-article/ami-penetratio...