[meyer]

Third, there's the problem of excess. If the installation produces too much power, it will means to sell it back to the grid. And this will require complex metering, and America's power grid could hardly be called high-tech or flexible.

Indeed, we've had directional as well as time-of-use metering for many decades. It's hardly complex or "high-tech". Granted, it is a bit more expensive than a simple watthour meter installed at a house, but these metering functions have been in use in commercial and industrial services for a lot longer than I've been alive. And I'm a little old.

[-YYZ-]

“It’s hardly complex or “high-tech”.”

Not in small quantitities, but if there was enough of it you now have a relatively unpredictable power generation source on the grid, not something that the operators generally want. Averaged over a large enough area, though, much as with wind power, it should be manageable.