By Denis Hayes and Scott Denman
April 22, 2014 — Updated 1256 GMT (2056 HKT)
(CNN) — At long last, this Earth Day we celebrate the true dawn of the Solar Age. That sunrise is hastened, here and abroad, by the slow demise of the once-touted "too-cheap-to-meter" Atomic Age of nuclear power.
As utilities find nuclear power less and less cost effective, new solar photovoltaic installations in the United States are springing up. New solar installations in 2013 reached a record 4.2 gigawatts, bringing the total to 10. On average, one gigawatt of solar photovoltaics powers 164,000 U.S. homes. That means power for 1.6 million homes.
Worldwide, in 2013, solar power installations grew by 38 gigawatts, from 96 to 134. According to the World Nuclear Industry Status Report 2013, in the preceding year, 45 gigawatts of wind and 32 gigawatts of solar power were installed worldwide, compared with a net addition of just 1.2 gigawatts of nuclear.