Grid failures due to extreme weather events are causing deadly situations around the country. The electric grid caused the deadliest fire in California history. Now the grid is preemptively turned off during hot, dry wind events. Chloe Goshay explores how the grid was designed to work over a hundred years ago and the new challenges it faces today. A microgrid in the South Side of Chicago keeps the lights and the heat on during the worst winter storm. Batteries and fuel cells replace backup generators and help the grid balance the supply and demand.