Voltage spike or brownout causing spurious data. Very annoying because it distorts your statistics, and make the graphs unreadable.
Unfortunately, TED gives us no way to edit the historical data in the TED5000, so you are stuck with enormous readings. This happens to me once every year or so. I have my MTU and gateway downstream of a filter.
So the months graph is useless (all because one instantaneuos reading saw an unrecognizable value of voltage or current so pasted the default reading of 214748364.7).

TED: why can't you modify the software to record a value of 0 when a reading is unintelligible? My graph above is missing several years worth of data because I have reset totals to zero repeatedly to get rid of values like this.
This has been discussed previously REPEATEDLY and we were promised a fix was in the works....5 years ago.
It was on their "to-do" list back in September of 2011. Guess that they still have not got around to "To-Doing" it yet.
Come on guys. It has been close to a year since you said it was on the "To-do" list,