Plug-in solar panels for balconies have become the surprise clean energy story of the year, according to Canary Media's weekly newsletter. The outlet says the trend is already unmistakable as summer winds down, even though it started the year largely unknown.

The appeal appears to be simplicity: these panels plug directly into household outlets, bypassing the cost and complexity of rooftop installations. That makes them an option for renters and apartment dwellers.

Canary Media's analysis is a single source, so no differing viewpoints are available. But it signals that small-scale, plug-in solar may be entering the mainstream US market.