The systems allow apartment residents to generate electricity without rooftop installations. Supporters say balcony solar could make clean energy more accessible in cities, particularly for renters and lower-income households.

Known as “balcony solar” systems, the technology has expanded rapidly in countries such as Germany, where simplified regulations and lower costs boosted adoption. Advocates believe similar systems could help reduce household energy bills and increase public participation in renewable energy in the US. However, regulatory barriers and building codes still limit widespread use in many American cities.