Does the USB gateway need to be plugged in all the time?

No, the modlet can store data for up to 12 days. Once you turn your computer on and plug in your USB, all the readings stored on your modlet will synchronize with your account. Synchronization can take 15 minutes per modlet, depending on the amount of data being transferred. The modlet also stores schedules and will continue to follow them even if the computer is off or the USB is unplugged.

Link
http://support.thinkecoinc.com/customer/portal/articles/1984657-does-the-usb-gateway-need-to-be-plugged-in-all-the-time-

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