[yason]

The SIM plan used by the electric company might come from a contract that favors small amounts of data transfer. A meter probably won't use many kilobytes or megabytes per month. If I were such a company I'd try to negotiate for expensive $/byte ratio and very low if negligible monthly fee, knowing I will only ever transfer small amounts of data.

[pyre]

What happens when one of your systems becomes buggy and starts using lots of data transfer? Oops!

[eropple]

Then you learn a painful lesson about fixing your systems. But in that case, you're at fault, and are on the hook yourself.

Here? Not so much.

[pyre]

To me the lesson would be that things break, and deals like this should probably include some sort of cushion. I'd be cautious of just banking on the fact that we'd never have to pick up a huge bandwidth bill because nothing would ever go wrong.