Why are citizens so scared of the blackout form city of ember book?

Citizens in "City of Ember" are scared of the blackout because it marks a period of darkness and uncertainty. The blackout signifies a loss of essential services like electricity and light, creating fear and anxiety among the citizens who rely on these comforts for daily living. Additionally, the blackout intensifies the mysterious and oppressive environment of the city, adding to the overall sense of unease.