Electricity is essential for our day-to-day lives. It powers our homes, commercial and industrial activities, and critical social services such as hospitals and emergency responders. Nearly all other vital infrastructures such as telecommunications, natural gas delivery, and transportation are dependent on continually available electricity. However, electricity systems in the U.S. and other countries are vulnerable to diverse and evolving threats that can cause large-area outages that last for days, weeks, or longer. This report identifies technologies, policies, and organizational strategies to increase the resilience of the nation's electric system in the face of large outages.