As the federal government looks to a second (or even third) stimulus bill, Congress should consider a huge opportunity to pay Americans that pays back: solar rooftops. Somewhat more than one in three home or business rooftops in America is suitable for solar: sunny with sufficient space to host a few panels. By investing $450 billion in rooftop solar, the federal government could slash energy bills for Americans, cut air pollution, and create over 3.7 million jobs. The government could also get paid back.