Solar is not like other energy sources. Photovoltaic cells are a transformative technology, Alexis Madrigal, The Atlantic's senior technology editor, argues in the short video above. The faster the price of solar energy falls, the more viable it becomes as a source of clean power -- and the sooner we'll see it on roofs across America. Animated by Lindsey Testolin, this clip is part of a six-part video series in The User's Guide to Energy special report.

Alexis Madrigal: theatlantic.com/alexis-madrigal/

Lindsey Testolin: lindseytestolin.com/

Story: theatlantic.com/video/archive/2013/08/when-will-solar-get-cheap/278779/

Atlantic Video: theatlantic.com/video

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