Plug-in solar is coming. Here’s how much you could save on electric bills

# Plug-in Solar Panels Could Lower Your Electric Bills—No Installation Fees Required Small solar panels that plug directly into your wall outlet are becoming legal in more states, and they could help you cut electricity costs without hiring electricians or getting permits. They're especially useful for apartment renters and homeowners who don't want expensive rooftop installations, since you can simply hang them in a window or on a deck. A new online calculator lets you check your zip code to see exactly how much money you could save based on your local sunshine and current electric rates.