Richard Wagner developmental in its treatment of leitmotifs. Wagner took 26 years from writing the first draft of a libretto in 1848 until he completed "Götterdämmerung" in 1874. The "Ring" takes about 15 hours to perform and is the only undertaking of such size to be regularly presented on the world's stages. Wagner's final opera, "Parsifal" (1882), which was his only work written especially for his Bayreuth Festspielhaus and which is described in the score as a ""Bühnenweihfestspiel"" ("festival play for the consecration of the stage"), has a storyline suggested by elements of the legend of the Holy Grail. It also carries
Herbert A. Wagner Generating Station through 1942. Wagner also held a patent on a self-starting, single-phase motor and founded in 1891 the Wagner Electric Manufacturing Company in St. Louis, Missouri. The plant was originally constructed by a predecessor company of Constellation Energy, which was later purchased by Exelon in 2012. On August 9, 2012, Exelon announced that it had reached an agreement, subject to regulatory approvals, for the sale of the Charles P. Crane, Brandon Shores, and Herbert A. Wagner Generating Stations to Raven Power Holdings LLC, a newly formed portfolio company of Riverstone Holdings LLC, for approximately $400 million. Exelon had committed to divest