UL Solutions has released new technical guidance and a proposed certification pathway for plug-in balcony solar systems, addressing safety risks and design requirements as US states consider legalizing the technology. The white paper outlines safety considerations such as overcurrent protection, touch safety, and ground-fault protection for consumer-installed solar systems that connect directly to wall outlets. UL developed a new certification pathway, UL 3700, following the passage of Utah's balcony solar legislation, with similar bills under consideration in other states. Potential mitigation measures include dedicated circuits, solar-specific receptacles, and careful design for interactions with ground-fault circuit interrupters. UL emphasizes evaluating safety outcomes over commercial viability for plug-in PV systems.