Grid connection status sensor

[IanK6449]

Hi, firstly thank you for building this integration. It plays a central role in managing my house's power consumption and EV charging. I would like to put an automation on place that gracefully shuts down HASS in the event of a power outage (I have a small UPS). Is there a sensor exposed by this integration that I can use to tell me whether grid power is available? I've looked at the status sensor but I don't think that's to do with the grid, just the inverter itself.
Open to any and all suggestions and grateful for any assistance.

Cheers,

Ian