I don’t know much about the privacy invasive implications of smart meters, but I’m going to guess they’re like when you use Progressive Snapshot or some kind of device to let a car insurance company know how you drive.
They may offer you a discount for providing the data. They may tell you that it will give them a better idea of safe a driver you are. But in the end they want to monitor you more closely to see if they should be charging you more. They want you to snitch on yourself.
I could be wrong, but that’s the sense I get. If I’m right then you can use that line when organizing with your neighbors.
Besides that you can talk about the unnecessary risks that come with smart devices and how their service could be interrupted if something goes wrong. In this case I don’t know what those vulnerabilities are, but it could help. You can boil it down to the idea that not everything needs a computer in it. Not everything needs a wifi connection. If standard meters work just fine, don’t mess with it.
Just some arguments of the top of my head.