You're also drawing attention to the economic issues involved with extreme price fluctuations. Both really good points.

Are the people proposing to do the aggregating really that good? Co-ops, perhaps? Because it could be a way to screw over property owners really effectively.

And when I have considered the issue, making it work for the homeowner was more of a concern, and getting paid even a fair rate compared to what they paid. Extreme price fluctuations put a whole new spin on it. I would think the power companies would have some interest in the homeowner getting the least money for their power, and the middlemen would have an overriding interest in it, since it would be a lot larger portion of their profit margin. That's why I think co-ops or something. In this part of the country there's legal infrastructure for creating PUDs, even tiny ones. There's a bunch of places where a handful of homes created a water district. But I would think a for-profit business the worst possible structure for managing it in the interests of the homeowners.