Interesting physics...

Solar PV is Environmentally Friendly: Over its lifetime a single gram of silicon (main component in solar cells) can produce 3,300 kWh of electricity without releasing life threatening toxic and radioactive substances. A single gram of uranium can produce 3,800 kWh of electricity.  However, a uranium atom can only be fissioned once, whereas a silicon solar cell can absorb photons repeatedly to generate electricity. Gram for gram, silicon and uranium produce comparable amounts of electricity.