@Mark 65 Re: Really, that Much?
I read that article. I also, and this I suspect may make me the only person in this thread to have done this, read the paper it was reporting. The words "monumentally overblown" come to mind.
First off: the error only affects three-phase meters. That's already a pretty small minority, and even smaller of residential meters. Of single-phase meters - the type my home, like nearly everyone else's, has, it says:
Several single-phase static energy meters were measured in various setups. [...] The results can be summarized in one sentence: no deviation beyond the specification could be observed; no influence of interference due to interfering or distorted voltage, and no influence caused by interfering currents were observed.
In other words: "the ordinary, domestic meters took everything we could throw at them and shrugged it off without even flinching".
Second: to get the huge errors the "coverage" screams about, you need not only a three-phase Rogowski coil (or Hall-effect, but those meters generally under-recorded so why would you complain anyway?) meter, but also a very, very strange configuration of load. Specifically, you need your entire load to be connected in series to a dimmer switch, with the dimmer switch permanently set to 135 degrees. I can't quite begin to imagine why anyone would have load configured like that, or why they would expect ti to be cheap if they did.