>Load shedding is implemented at the distribution substation level, not individual customers
Not really, what I'm talking about are devices that turn off high load devices when system load is too high, so the load can be reduced[1]. While it might be true that these devices aren't activated on a per-residence level, the general effect of raising prices, and people's electricity getting cut off in response is the same. The only difference is that you're shutting off power to people who are willing to pay for it the least, rather than the whole neighborhood.