I’ll get you one step further. Because you’ve handled the trigger part (I use a power source switches to battery event from the Ring Alarm Extender Gen 2 for mine), the next piece (actually, last action for your Rule) is to shutdown Hubitat. To do that, install Dominic Meglio’s (@dman2306’s) Hubitat Hub Controller driver (installable via Hubitat Package Manager, also by Dominic Meglio) and do a shutdown() Actuator custom command on that virtual device.
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