SOLAR: DOE offers $1M in prizes for efforts to shrink rooftop costs Katherine Ling, E&E reporter Published: Tuesday, May 20, 2014 The Department of Energy turned the high costs today of installing and financing solar panels into public enemy No. 1. Please subscribe to E&ENews PM to read the full story. Username: Password: Forgot your access codes? Recover them. Not a subscriber? Sign up for a trial. Ready to subscribe? Click here.