Definitely not paranoid. This is the time to get ahead of this. For distributed energy scenarios in which various sites operated by different administrators (

Definitely not paranoid. This is the time to get ahead of this. For distributed energy scenarios in which various sites operated by different administrators (my_neighborhood_solar, big utility, your_personal_site) may exchange energy, then how do we securely design the communication between the smart meters? For example, perhaps dedicated SIMs would get the traffic off our home networks, but the resultant network would need security.