“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.
From the standpoint of the interconnection (the grid, if you will), it's not significant as a generating source until it starts reaching the megawatt level. I don't mean megawatts of reduced load, I mean megawatts of energy in excess of load being pushed back into the grid. Then, a simple tabulation system, a modem, and a moderately good internet connection are all that are required.
We've been telemetering energy-generating industrial customers using 1200 bps modems for years. Only in the last 10 years or so have we started using broadband.