1951 saw the first electric power ever generated from which source?

Which 1951 science-fiction film features the famous phrase "Klaatu barada nikto"? In which 1951 film does a missionary's sister tell her boat captain, "Nature, Mr. Allnut, is what we are put in this wo… Gene Kelly plays an ex-GI painter on Paris's Left Bank in which 1951 Best Picture winner? Which country produced the 1951 film "Rashomon"? The 1951 cartoon "Scent-imental Romeo" starred which amorous skunk? The 1951 Battle of Heartbreak Ridge was fought during which war? In Herman Wouk's 1951 novel "The Caine Mutiny," who commands the ship before the mutiny? In which 1951 Disney film does the Queen of Hearts want to chop off a little girl's head?