UNITED STATES
                       SECURITIES AND EXCHANGE COMMISSION
                             Washington, D.C. 20549



                                  SCHEDULE 13G

                   Under the Securities Exchange Act of 1934*

                                (Amendment No. 1)



                          UniSource Energy Corporation
                          ----------------------------
                                (Name of Issuer)


                           Common Stock, no par value
                           --------------------------
                         (Title of Class of Securities)


                                    909205106
                                    ---------
                                 (CUSIP Number)


                                December 31, 2008
                                -----------------
             (Date of Event Which Requires Filing of this Statement)


Check the appropriate box to designate the rule pursuant to which this Schedule
is filed:

                                [ ] Rule 13d-1(b)
                                [X] Rule 13d-1(c)
                                [ ] Rule 13d-1(d)


  *The remainder of this cover page shall be filled out for a reporting person's
  initial filing on this form with respect to the subject class of securities,
  and for any subsequent amendment containing information which would alter the
  disclosures provided in a prior cover page.

  The information required in the remainder of this cover page shall not be
  deemed to be "filed" for the purpose of Section 18 of the Securities Exchange
  Act of 1934 ("Act") or otherwise subject to the liabilities of that section of
  the Act but shall be subject to all other provisions of the Act (however, see
  the Notes).








------------------------------                             ---------------------
CUSIP No.  909205106                       13G             Page 2 of 5  Pages
------------------------------                             ---------------------

---------- ---------------------------------------------------------------------
1          NAME OF REPORTING PERSON
           S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON

           Duquesne Capital Management, L.L.C.
---------- ---------------------------------------------------------------------
2          CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*
                                                                   (a) [ ]
                                                                   (b) [X]
---------- ---------------------------------------------------------------------
3          SEC USE ONLY
---------- ---------------------------------------------------------------------
4          CITIZENSHIP OR PLACE OF ORGANIZATION

           Pennsylvania
-------------------- ------ ----------------------------------------------------
                     5      SOLE VOTING POWER

                            0
                     ------ ----------------------------------------------------
     NUMBER OF       6      SHARED VOTING POWER
      SHARES
   BENEFICIALLY             1,781,000
     OWNED BY
       EACH          ------ ----------------------------------------------------
     REPORTING       7      SOLE DISPOSITIVE POWER
      PERSON
       WITH                 0
                     ------ ----------------------------------------------------
                     8      SHARED DISPOSITIVE POWER

                            1,781,000
---------- ---------------------------------------------------------------------
9          AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

           1,781,000
---------- ---------------------------------------------------------------------
10         CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES*

           N/A
---------- ---------------------------------------------------------------------
11         PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 9

           5.0%
---------- ---------------------------------------------------------------------
12         TYPE OF REPORTING PERSON*

           OO
---------- ---------------------------------------------------------------------






------------------------------                             ---------------------
CUSIP No.  909205106                       13G             Page 3 of 5  Pages
------------------------------                             ---------------------

---------- ---------------------------------------------------------------------
1          NAME OF REPORTING PERSON
           S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON

           Stanley F. Druckenmiller
---------- ---------------------------------------------------------------------
2          CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*
                                                                   (a) [ ]
                                                                   (b) [X]
---------- ---------------------------------------------------------------------
3          SEC USE ONLY
---------- ---------------------------------------------------------------------
4          CITIZENSHIP OR PLACE OF ORGANIZATION

           United States
-------------------- ------ ----------------------------------------------------
                     5      SOLE VOTING POWER

                            0
                     ------ ----------------------------------------------------
     NUMBER OF       6      SHARED VOTING POWER
      SHARES
   BENEFICIALLY             1,781,000
     OWNED BY
       EACH          ------ ----------------------------------------------------
     REPORTING       7      SOLE DISPOSITIVE POWER
      PERSON
       WITH                 0
                     ------ ----------------------------------------------------
                     8      SHARED DISPOSITIVE POWER

                            1,781,000
---------- ---------------------------------------------------------------------
9          AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

           1,781,000
---------- ---------------------------------------------------------------------
10         CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES*

           N/A
---------- ---------------------------------------------------------------------
11         PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 9

           5.0%
---------- ---------------------------------------------------------------------
12         TYPE OF REPORTING PERSON*

           IN
---------- ---------------------------------------------------------------------






     This Amendment No. 1 to Schedule 13G (this "Amendment No. 1") is filed with
respect to the common stock, no par value (the "Common Stock") of UniSource
Energy Corporation, a corporation organized under the laws of the State of
Arizona (the "Company"), to amend the Schedule 13G filed on December 5, 2008
(the "Schedule 13G"), in accordance with the annual amendment requirements.
Capitalized terms used but not defined herein have the meaning ascribed thereto
in the Schedule 13G.

Item 4:   Ownership:
------    ---------

     Item 4 of the Schedule 13G is hereby amended by deleting the entirety of
the text thereof and replacing it with the following:

     The beneficial ownership of Common Stock by the Reporting Persons, as of
the date of this Amendment No. 1, is as follows:

  A. Duquesne Capital
     ----------------
     (a) Amount beneficially owned: 1,781,000.
     (b) Percent of class: 5.0%. The percentages used herein and in the rest of
this Amendment No. 1 are calculated based upon a total of 35,494,089 shares of
Common Stock issued and outstanding as of November 4, 2008, as reported in the
Company's Quarterly Report on Form 10-Q for the quarterly period ended September
30, 2008.
     (c) Number of shares as to which such person has:
          (i)   Sole power to vote or direct the vote: -0-
          (ii)  Shared power to vote or direct the vote: 1,781,000
          (iii) Sole power to dispose or direct the disposition: -0-
          (iv)  Shared power to dispose or direct the disposition: 1,781,000

   B. Mr. Druckenmiller
      -----------------
     (a) Amount beneficially owned: 1,781,000.
     (b) Percent of class: 5.0%.
     (c) Number of shares as to which such person has:
          (i)   Sole power to vote or direct the vote: -0-
          (ii)  Shared power to vote or direct the vote: 1,781,000
          (iii) Sole power to dispose or direct the disposition: -0-
          (iv)  Shared power to dispose or direct the disposition: 1,781,000

Item 10:   Certification:
-------    -------------

     Each Reporting Person hereby makes the following certification:

     By signing below I certify that, to the best of my knowledge and belief,
the securities referred to above were not acquired and are not held for the
purpose of or with the effect of changing or influencing the control of the
issuer of the securities and were not acquired and are not held in connection
with or as a participant in any transaction having that purpose or effect.


              [THE REMAINDER OF THIS PAGE LEFT INTENTIONALLY BLANK]

                                      -4-









                                    SIGNATURE

     After reasonable inquiry and to the best of my knowledge and belief, I
certify that the information set forth in this statement is true, complete and
correct.

Dated:  February 12, 2009


                                          DUQUESNE CAPITAL MANAGEMENT, L.L.C.


                                          By:  /s/ Gerald Kerner
                                               ---------------------------------
                                               Name:  Gerald Kerner
                                               Title: Managing Director




                                          STANLEY F. DRUCKENMILLER


                                          By:  /s/ Gerald Kerner
                                               ---------------------------------
                                               Name:  Gerald Kerner
                                               Title: Attorney-in-Fact



               [SIGNATURE PAGE TO AMENDMENT NO. 1 TO SCHEDULE 13G
                  WITH RESPECT TO UNISOURCE ENERGY CORPORATION]