The Collaborative International Dictionary of English v.0.48:

Electrify \E*lec"tri*fy\, v. t. [imp. & p. p. Electrified; p.
   pr. & vb. n. Electrifying .] [Electric + -fy.]
   1. To communicate electricity to; to charge with electricity;
      as, to electrify a jar.
      [1913 Webster]

   2. To cause electricity to pass through; to affect by
      electricity; to give an electric shock to; as, to
      electrify a limb, or the body.
      [1913 Webster]

   3. To excite suddenly and violently, esp. by something highly
      delightful or inspiriting; to thrill; as, this patriotic
      sentiment electrified the audience.
      [1913 Webster]

            If the sovereign were now to immure a subject in
            defiance of the writ of habeas corpus . . . the
            whole nation would be instantly electrified by the
            news.                                 --Macaulay.
      [1913 Webster]

            Try whether she could electrify Mr. Grandcourt by
            mentioning it to him at table.        --G. Eliot.
      [1913 Webster]

   4. To equip for employment of electric power; to modify (a
      device) so that it uses electrical power as the main
      source of energy; as, to electrify a railroad.
      [Webster 1913 Suppl. +PJC]

WordNet (r) 3.0 (2006):

electrifying
    adj 1: causing a surge of emotion or excitement; "she gave an
           electrifying performance"; "a thrilling performer to
           watch" [syn: electrifying, thrilling]

Moby Thesaurus II by Grady Ward, 1.0:

47 Moby Thesaurus words for "electrifying":
   abrupt, astonishing, battery-powered, dynamoelectric, electric,
   electric-powered, electrified, electrochemical, electrodynamic,
   electrokinetic, electromechanical, electrometric, electromotive,
   electropneumatic, electrostatic, electrothermal, galvanic,
   galvanometric, hasty, headlong, hydroelectric, impetuous,
   impulsive, jarring, jolting, nerve-shattering, photoelectric,
   piezoelectric, precipitant, precipitate, precipitous, quick,
   shocking, speedy, staggering, startling, static, stunning, sudden,
   surprising, swift, unanticipated, unexpected, unforeseen,
   unlooked-for, unpredicted, voltaic