How your solar rooftop became a national security issue

James Showalter describes a pretty specific if not entirely implausible nightmare scenario. Someone drives up to your house, cracks your Wi-Fi password, and then starts messing with the solar inverter mounted beside your garage. This unassuming gray box converts the direct current from your rooftop panels into the alternating current that powers your home.

“You’ve got to have a solar stalker” for this scenario to play out, says Showalter, describing the kind of person who would need to physically show up in your driveway with both the technical know-how and the motivation to hack your home energy system.

The CEO of EG4 Electronics , a company based in Sulphur Springs, Texas, doesn’t consider this sequence of events particularly likely. Still, it’s why his company last week found itself