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Skinny, cheap comms such as LoRa would be perfect for redundancy. If you can at least get a simple message to the batteries (charge/discharge at xkW) you still have most of your effectiveness of the system.

One nice thing though is many of the stability services (such as balancing frequency) can be detected locally and therefore centralised dispatch and comms aren't necessary. All of our household systems have high speed metering attached (sampling at 20hZ) and when they make a frequency measurement outside the normal operating range (48.8Hz - 50.2Hz) they discharge/charge respectively. This means that when there's an event we have all the systems reacting in a way that looks coordinated, but is actually just syncronised (as they all essentially have the same input -- grid frequency), so services like this are extremely resilient.

In a sense this is 'virtual inertia', since your local control systems are configured to resist a change in frequency.

Presumably you need comms later to add up how much frequency support you ended up providing, for market settlement?

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