DIY "plug-in solar" kits, already popular across Europe, are gaining traction in the US as a low-cost alternative to traditional rooftop solar installations. Unlike conventional systems, which can cost around $15,000 and require contractors, permits and utility approval, these plug-in kits start at roughly $300, need no electrician, and can simply be hung from a balcony or propped against a wall and connected to a standard wall socket. Their spread matters because it could significantly lower the barrier to household energy generation, particularly as energy costs remain volatile.

The kits typically pair a few solar panels with a small microinverter that feeds power directly into the home's electrical system, with an optional battery (from around $500 for 1kWh) to store surplus energy or provide backup power during outages. Adoption has been driven by high oil and gas prices since Russia's invasion of Ukraine and record-low global solar panel and battery costs, though US buyers face higher prices due to tariffs and the removal of solar tax credits. Historically, US utility rules treated even small garden panels like large rooftop arrays, but over a dozen states have now passed or proposed laws permitting plug-in solar without prior utility approval, provided safety standards are met.