Podcast:99% Invisible Published On: Tue May 02 2017 Description: For most people, electricity only flows one way (into the home), but there are exceptions — people who use solar panels, for instance. In those cases, excess electricity created by the solar cells travels back out into the grid to … Continue reading → Subscribe to SiriusXM Podcasts+ on Apple Podcasts to listen to ad-free new episodes and get exclusive access to bonus content.