I had strange corruption of my hourly history. Just installed the TED and the first two days worked fine then my month kWh usage started going down! The hourly graphs has many seemingly random hours with zero usage. Exporting the history showed much corruption with many completely garbage dates and corrupted values. Clearing the history fixed it. My theory is that I tried to set a Tiered & TOU rate structure and part way through that I realized I could not express what I needed to in the forms so I cancelled that setup. But, I believe the TED changed the structure of the hourly data in keeps but because I cancelled that setup it left the gateway in a confused state. It was recording data in the flat rate structure, but accessing the data with the Tiered & TOU structure. I could tell this because the export format changed after the reset.