Zobel said:
I don't think that is what they are for, but it's possible. They'd be running as grid forming / power islands in that case and setting frequency. Truly disconnected from the grid, and you'd have to manage load on that block independently. I really dont think that's the idea.
I think they're there as a back stop on peak demand days. Liquid fuel peakers to fire up at critical nodes to prevent brownouts.
I'm not upset about the idea, and even if they never run they are providing a service (backup is a service, just like insurance, and costs even if never used). Just wonder who gets the profit if they fire up and sell power at $9000/MWh. The whole point of deregulation was to break apart infrastructure/ delivery from generation. If we need that backup, it should be done by a separate entity and the risk/reward needs to be coupled and carried by them.
Edit to add. They may also be there for what's called black start. If you lose the grid, like all the power is out, most power plants can't start. They need AC power to start up, to run pumps etc. Black start units have batteries and DC systems and are usually liquid fired (so not reliant on electric compressor supplied natural gas..) so they can start up and bootstrap the grid. I could see that being a valid CP mission.
I know about black starts and such; designed LNG plants that were power islands and got to go through the whole process of what to start and how, along with load shedding and such when one of your generator trips.
But agreed that the idea of using them for peakers is fine; but they aren't in the generation business. The whole point of breaking it up was so that there was space. But I see the power grid just like the EtOH business (beer). Eventually the groups get back togher because "they really like each other and this time it'll be different!" unless someone (the gov't) steps in and says no.
But after the derecho, a buddy who works for CNP said they were deploying generators for substations to bring power to all. I didn't press for details, but that's the only reason I could see. Partial to total inlet line loss, but demand is still there. Or partial inlet capacity and local generation to 'boost' for demand.
~egon