Why do you could think one could recreate such a large cooperative like this without much trouble? Isn't the likely outcome of this bankruptcy a sale of assets to private equity: a situation that can probably never be reversed?
What do you think this cooperative did if it was not facilitating the transactions between power plans and consumers? I'm confused by your assertion.
The power grid is the platform; I'm not sure how the original poster intended to apply the platform argument to the cooperative.
As far as recreating the cooperative goes: it doesn't need to start large, and I'm reasonably sure it doesn't hold much in assets. My understanding is that this cooperative is simply a collective of buyers who "pool their shopping", so money flows in and back out. A new cooperative may need to work its way back up to bulk pricing, but that should be doable?
This really applies to the power grid itself. Even the power plants aren't covered by the argument, since if you have a reasonable grid, you can build another power plant of any kind you feel viable in some reasonably suitable place.
[Ed. add.: the grid is actually the market. It facilitates the transactions between power plants and consumers.]