UNITED STATES
                      SECURITIES AND EXCHANGE COMMISSION
                            Washington, DC 20549

                                  Form 13F

                            Form 13F COVER PAGE

This filing lists a security holding not reported on the Form 13F filed on
February 13, 2007 due to an inadvertent error in reporting of shares impacted
by the issuer's corporate action.

Report for the Calendar Year or Quarter Ended:            December 31, 2006

Check here if Amendment     [ X];         Amendment Number:  1
This Amendment (Check only one.):       [  ] is a restatement.
                                        [ X] adds new holdings entries.


Institutional Investment Manager Filing this Report:

Name:        T. Rowe Price Associates, Inc.
Address:     100 East Pratt Street
             Baltimore, Maryland  21202

Form 13F File Number:  28-115

The institutional investment manager filing this report and the person by whom
it is signed hereby represent that the person signing the report is authorized
to submit it, that all information contained herein is true, correct and
complete, and that it is understood that all required items, statements,
schedules, lists, and tables, are considered integral parts of this form.

Person Signing this Report on Behalf of Reporting Manager:

Name:     Henry H. Hopkins
Title:    Vice President
Phone:    410-345-6603

Signature, Place, and Date of Signing:

      /S/ Henry H. Hopkins        Baltimore, Maryland             05/23/2007
         [Signature]                [City, State]                   [Date]

Report type (Check only one.):

[ X] 13F HOLDINGS REPORT.  (Check here if all holdings of this reporting
manager are reported in this report.)

[  ] 13F NOTICE. (Check here if no holdings reported are in this report, and
all holdings are reported by other reporting manager(s).)

[  ] 13F COMBINATION REPORT. (Check here if a portion of the holdings for
this reporting manager are reported in this report and a portion are
reported by other reporting manager(s).)

List of Other Managers Reporting for this Manager:       NONE



                          Form 13F SUMMARY PAGE

Report Summary:

Number of Other Included Managers: 0

Form 13F Information Table Value Total:    1

Form 13F Information Table Entry Total:    658211


List of Other Included Managers: NONE






                                                    FORM 13F INFORMATION TABLE

                               TITLE OF               VALUE    SHARES/  SH/ PUT/ INVSTMT OTH           VOTING AUTHORITY
NAME OF ISSUER                 CLASS      CUSIP      (x$1000)  PRN AMT  PRN CALL DSCRETN MGR       SOLE      SHARE       NONE
------------------------------ ---------- --------- -------- ---------- --- ---- ------- --- ---------- ---------- ----------
                                                                        
DUKE ENERGY CORP               COMM STK   26441c105   658211   19819657 SH       SOLE           5306414          0   14513243