Tablo is basically a DVR product(time shifting) that also supports live TV - linear TV. There is also a power usage difference between a 2-tuner and 4-tuner model. For a household, the average amount of time recording and watching must be larger then 4 hours.
But if I assume the original proposition of a wasted 87 Kilowatts per year, even in my high energy cost state that comes out to around 74 cents a month.
My routers, powerline adapter, WiFi extenders, Roku’s, FireTV sticks electricity cost must be way more then that. And who knows how much it costs when I fall asleep with the TV on.