OHIO POWER CO
SC 13G, 1994-09-12
ELECTRIC SERVICES
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<PAGE>
 
                                                --------------------------------
                                                |       OMB APPROVAL           |
                      UNITED STATES             |OMB Number     3235-0145      |
           SECURITIES AND EXCHANGE COMMISSION   |Expires:  October 3l, 1994    |
                  Washington, D.C. 20549        |Estimated average burden      |
                                                |hours per response . . . 14.90|
                                                --------------------------------

                                 SCHEDULE 13G
 
 
                   Under the Securities Exchange Act of 1934
                          (Amendment No. __________)*
 
                              Ohio Power Company
- --------------------------------------------------------------------------------
                               (Name of Issuer)
 
                       8.04% Cumulative Preferred Stock
- --------------------------------------------------------------------------------
                        (Title of Class of Securities)

                                   677415507
                      ----------------------------------
                                (CUSIP Number)


Check the following box if a fee is being paid with this statement [X]. (A fee
is not required only if the filing person: (1) has a previous statement on file
reporting beneficial ownership of more than five percent of the class of
securities described in Item 1; and (2) has filed no amendment subsequent
thereto reporting beneficial ownership of five percent or less of such class.)
(See Rule 13d-7).

*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).




SEC 1745                         PAGE 1 OF 9 PAGES
<PAGE>
 
- -------------------                                           ----------------- 
CUSIP No. 677415507                     13G                   Page 2 of 9 Pages
- -------------------                                           -----------------

- --------------------------------------------------------------------------------
1          NAME OF REPORTING PERSON
           S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON
          
           John Hancock Mutual Life Insurance Company
           I.R.S. No. 04-1414660
- --------------------------------------------------------------------------------
2          CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*         (a) [ ]
                                                                     (b) [ ]
           N/A
 
- --------------------------------------------------------------------------------
3          SEC USE ONLY
           

- --------------------------------------------------------------------------------
4          CITIZENSHIP OR PLACE OF ORGANIZATION
           
           Commonwealth of Massachusetts

- --------------------------------------------------------------------------------
                 5          SOLE VOTING POWER
Number of
 Shares                     -0-
               -----------------------------------------------------------------
Beneficially     6          SHARED VOTING POWER
  Owned by
    Each                    -0-
               -----------------------------------------------------------------
 Reporting       7          SOLE DISPOSITIVE POWER
  Person
   With                     -0-
               -----------------------------------------------------------------
                 8          SHARED DISPOSITIVE POWER
 
                            -0-
- --------------------------------------------------------------------------------
9          AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

           None, except through its indirect, wholly-owned subsidiary, John
           Hancock Advisers, Inc.
- --------------------------------------------------------------------------------
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
 
           See line 9, above.
 
- --------------------------------------------------------------------------------
12         TYPE OF REPORTING PERSON*
 
           IC, BD, IA, HC

- --------------------------------------------------------------------------------
                     *SEE INSTRUCTIONS BEFORE FILLING OUT!
                               PAGE 2 OF 9 PAGES
 
<PAGE>
 
- -------------------                                           ----------------- 
CUSIP No. 677415507                     13G                   Page 3 of 9 Pages
- -------------------                                           -----------------

- --------------------------------------------------------------------------------
1          NAME OF REPORTING PERSON
           S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON
          
           John Hancock Subsidiaries, Inc.
           I.R.S. No. 04-2687223
- --------------------------------------------------------------------------------
2          CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*         (a) [ ]
                                                                     (b) [ ]
           N/A
 
- --------------------------------------------------------------------------------
3          SEC USE ONLY
           

- --------------------------------------------------------------------------------
4          CITIZENSHIP OR PLACE OF ORGANIZATION
           
           Delaware

- --------------------------------------------------------------------------------
                 5          SOLE VOTING POWER
Number of
 Shares                     -0-
               -----------------------------------------------------------------
Beneficially     6          SHARED VOTING POWER
  Owned by
    Each                    -0-
               -----------------------------------------------------------------
 Reporting       7          SOLE DISPOSITIVE POWER
  Person
   With                     -0-
               -----------------------------------------------------------------
                 8          SHARED DISPOSITIVE POWER
 
                            -0-
- --------------------------------------------------------------------------------
9          AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

           None, except through its indirect, wholly-owned subsidiary, John
           Hancock Advisers, Inc.
- --------------------------------------------------------------------------------
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
 
           See line 9, above.
 
- --------------------------------------------------------------------------------
12         TYPE OF REPORTING PERSON*
 
           HC

- --------------------------------------------------------------------------------
                     *SEE INSTRUCTIONS BEFORE FILLING OUT!
                               PAGE 3 OF 9 PAGES
<PAGE>
 
- -------------------                                           ----------------- 
CUSIP No. 677415507                     13G                   Page 4 of 9 Pages
- -------------------                                           -----------------

- --------------------------------------------------------------------------------
1          NAME OF REPORTING PERSON
           S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON
          
           The Berkeley Financial Group
           I.R.S. No. 04-3145626
- --------------------------------------------------------------------------------
2          CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*         (a) [ ]
                                                                     (b) [ ]
           N/A
 
- --------------------------------------------------------------------------------
3          SEC USE ONLY
           

- --------------------------------------------------------------------------------
4          CITIZENSHIP OR PLACE OF ORGANIZATION
           
           Commonwealth of Massachusetts

- --------------------------------------------------------------------------------
                 5          SOLE VOTING POWER
Number of
 Shares                     -0-
               -----------------------------------------------------------------
Beneficially     6          SHARED VOTING POWER
  Owned by
    Each                    -0-
               -----------------------------------------------------------------
 Reporting       7          SOLE DISPOSITIVE POWER
  Person
   With                     -0-
               -----------------------------------------------------------------
                 8          SHARED DISPOSITIVE POWER
 
                            -0-
- --------------------------------------------------------------------------------
9          AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

           None, except through its direct, wholly-owned subsidiary, John
           Hancock Advisers, Inc.
- --------------------------------------------------------------------------------
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
 
           See line 9, above.
 
- --------------------------------------------------------------------------------
12         TYPE OF REPORTING PERSON*
 
           HC

- --------------------------------------------------------------------------------
                     *SEE INSTRUCTIONS BEFORE FILLING OUT!
                               PAGE 4 OF 9 PAGES
<PAGE>
 
- -------------------                                           ----------------- 
CUSIP No. 677415507                     13G                   Page 5 of 9 Pages
- -------------------                                           -----------------

- --------------------------------------------------------------------------------
1          NAME OF REPORTING PERSON
           S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON
          
           John Hancock Advisers, Inc.
           I.R.S. No. 04-2441573
- --------------------------------------------------------------------------------
2          CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*         (a) [ ]
                                                                     (b) [ ]
           N/A
 
- --------------------------------------------------------------------------------
3          SEC USE ONLY
           

- --------------------------------------------------------------------------------
4          CITIZENSHIP OR PLACE OF ORGANIZATION
           
           Delaware

- --------------------------------------------------------------------------------
                 5          SOLE VOTING POWER
Number of
 Shares                     20,000
               -----------------------------------------------------------------
Beneficially     6          SHARED VOTING POWER
  Owned by
    Each                    -0-
               -----------------------------------------------------------------
 Reporting       7          SOLE DISPOSITIVE POWER
  Person
   With                     20,000
               -----------------------------------------------------------------
                 8          SHARED DISPOSITIVE POWER
 
                            -0-
- --------------------------------------------------------------------------------
9          AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

           20,000

- --------------------------------------------------------------------------------
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
 
           13.3%
 
- --------------------------------------------------------------------------------
12         TYPE OF REPORTING PERSON*
 
           IA

- --------------------------------------------------------------------------------
                     *SEE INSTRUCTIONS BEFORE FILLING OUT!
                               PAGE 5 OF 9 PAGES
<PAGE>
 
     The original statement shall be signed by each person on whose behalf the
statement is filed or his authorized representative.  If the statement is signed
on behalf of a person by his authorized representative other than an executive
officer or general partner of the filing person, evidence of the
representative's authority to sign on behalf of such person shall be filed with
the statement, provided, however, that a power of attorney for this purpose
which is already on file with the Commission may be incorporated by reference.
The name and any title of each person who signs the statement shall be typed or
printed beneath his signature.

Note:  Six copies of this statement, including all exhibits, should be filed
with the Commission.

     Attention: Intentional misstatements or omissions of fact constitute
Federal criminal violations (See 18 U.S.C. 1001)


     Item 1(a)  Name of Issuer:
                -------------- 
                Ohio Power Company

     Item 1(b)  Address of Issuer's Principal Executive Offices:
                ----------------------------------------------- 
                c/o  American Electric Power Service Corporation
                     1 Riverside Plaza
                     Columbus, OH  43215

     Item 2(a)  Name of Person Filing:
                --------------------- 
                This filing is made on behalf of John Hancock Mutual Life
                Insurance Company ("JHMLICO"), JHMLICO's wholly-owned
                subsidiary, John Hancock Subsidiaries, Inc. ("JHSI"), JHSI's
                wholly-owned subsidiary, The Berkeley Financial Group ("TBFG")
                and TBFG's wholly-owned subsidiary, John Hancock Advisers, Inc.
                ("JHA").

     Item 2(b)  Address of the Principal Offices:
                -------------------------------- 
                The principal business offices of JHMLICO and JHSI are located
                at John Hancock Place, P.O. Box 111, Boston, MA 02117. The
                principal business offices of TBFG and JHA are located at 101
                Huntington Avenue, Boston, MA 02199.

     Item 2(c)  Citizenship:
                ----------- 
                JHMLICO and TBFG were organized and exist under the laws of the
                Commonwealth of Massachusetts. JHSI and JHA were organized and
                exist under the laws of the State of Delaware.

     Item 2(d)  Title of Class of Securities:
                ---------------------------- 
                8.04% Cumulative Preferred Stock.

     Item 2(e)  CUSIP Number:
                ------------ 
                677415507

     Item 3     If the Statement is being filed pursuant to Rule 13d-1(b), or
                -------------------------------------------------------------
                13d-2(b), check whether the person filing is a:
                ----------------------------------------------  
            
                JHMLICO:  (a) (X) Broker or Dealer registered under (S)15 of the
                                  Act.

                          (c) (X) Insurance Company as defined in (S)3(a)(19) of
                                  the Act.

                          (e) (X) Investment Adviser registered under (S)203 of
                                  the Investment Advisers Act of 1940.

                          (g) (X) Parent Holding Company, in accordance with
                                  (S)240.13d-1(b)(ii)(G).


                               PAGE 6 OF 9 PAGES
 
<PAGE>
 
                   JHSI:  (g) (X) Parent Holding Company, in accordance with
                                  (S)240.13d-1(b)(ii)(G).
 
                   TBFG:  (g) (X) Parent Holding Company, in accordance with
                                  (S)240.13d-1(b)(ii)(G).

                    JHA:  (e) (X) Investment Adviser registered under (S)203 of
                                  the Investment Advisers Act of 1940.
 
     Item 4     Ownership:
                ---------
 
                (a)  Amount Beneficially Owned:
                     -------------------------
                     JHA has direct beneficial ownership of 20,000 shares of
                     8.04% Cumulative Preferred Stock. Through their parent-
                     subsidiary relationship to JHA, JHMLICO, JHSI and TBFG have
                     indirect beneficial ownership of these same shares. The
                     shares are held by the Patriot Preferred Dividend Fund, a
                     closed end diversified management company registered under
                     (S)8 of the Investment Company Act.

 
                (b)  Percent of Class:   13.3%
                     ----------------
                             
                (c)  (i)   sole power to vote or to direct the vote:
                           JHA has sole power to vote or to direct the vote of
                           the 20,000 shares of the 8.04% Cumulative Preferred
                           Stock under an advisory agreement with the Patriot
                           Preferred Dividend Fund, dated May 21, 1993.
 
                     (ii)  shared power to vote or to direct the
                           vote:  -0-

                     (iii) sole power to dispose or to direct the disposition
                           of: JHA has sole power to dispose or to direct the
                           disposition of the 20,000 shares of the 8.04%
                           Cumulative Preferred Stock under the advisory
                           agreement noted in Item 4(c)(i) above.

                     (iv)  shared power to dispose or to direct the disposition
                           of: -0-

     Item 5     Ownership of Five Percent or Less of a Class:
                -------------------------------------------- 
                Not applicable.

     Item 6     Ownership of More than Five Percent on Behalf of Another Person:
                --------------------------------------------------------------- 
                None, other than the relationship between JHA and the
                diversified management company and its stockholders noted above.

     Item 7     Identification and Classification of the Subsidiary which
                ---------------------------------------------------------
                Acquired the Security Being Reported on by the Parent Holding 
                ------------------------------------------------------------- 
                Company:
                --------
                Not applicable.

     Item 8     Identification and Classification of Members of the Group:
                --------------------------------------------------------- 
                Not applicable.

     Item 9     Notice of Dissolution of a Group:
                -------------------------------- 
                Not applicable.



                               PAGE 7 OF 9 PAGES
<PAGE>
 
     Item 10    Certification:
                ------------- 
                By signing below the undersigned certifies that, to the best of
                its knowledge and belief, the securities referred to above were
                acquired in the ordinary course of business and were not
                acquired for the purpose of and do not have the effect of
                changing or influencing the control of the issuer of such
                securities and were not acquired in connection with or as a
                participant in any transaction having such purpose or effect.



                                   SIGNATURE


     After reasonable inquiry and to the best of its knowledge and belief, each
of the undersigned certifies that the information set forth in this statement is
true, complete and correct.
 

                                   JOHN HANCOCK MUTUAL LIFE INSURANCE COMPANY

                                   By: /s/ John T. Farady
                                      ---------------------------------------  
                                   Name:   John T. Farady
                                        -------------------------------------  
Dated: September 9, 1994           Title:  Vice President & Treasurer
      --------------------               ------------------------------------


                                   JOHN HANCOCK SUBSIDIARIES, INC.

                                   By: /s/ John T. Farady
                                      ---------------------------------------  
                                   Name:   John T. Farady
                                        -------------------------------------  
Dated: September 9, 1994           Title:  Vice President & Treasurer
      --------------------               ------------------------------------

   
                                   THE BERKELEY FINANCIAL GROUP

                                   By: /s/ Susan S. Newton
                                      ---------------------------------------  
                                   Name:   Susan Newton
                                        -------------------------------------  
Dated: September 9, 1994           Title:  Vice President
      --------------------               ------------------------------------


                                   JOHN HANCOCK ADVISERS, INC.

                                   By: /s/ Susan S. Newton
                                      ---------------------------------------  
                                   Name:   Susan Newton
                                        -------------------------------------  
Dated: September 9, 1994           Title:  Vice President
      --------------------               ------------------------------------



                               PAGE 8 OF 9 PAGES
<PAGE>
 
                                                                       EXHIBIT A

                            JOINT FILING AGREEMENT
                            ----------------------


     John Hancock Mutual Life Insurance Company, John Hancock Subsidiaries,
Inc., The Berkeley Financial Group and John Hancock Advisers, Inc. agree that
the initial Schedule 13G, to which this Agreement is attached, relating to the
8.04% Cumulative Preferred Stock of Ohio Power Company, is filed on behalf of
each of them.

 
                                   JOHN HANCOCK MUTUAL LIFE INSURANCE COMPANY

                                   By: /s/ John T. Farady
                                      ---------------------------------------  
                                   Name:   John T. Farady
                                        -------------------------------------  
Dated: September 9, 1994           Title:  Vice President & Treasurer
      --------------------               ------------------------------------


                                   JOHN HANCOCK SUBSIDIARIES, INC.

                                   By: /s/ John T. Farady
                                      ---------------------------------------  
                                   Name:   John T. Farady
                                        -------------------------------------  
Dated: September 9, 1994           Title:  Vice President & Treasurer
      --------------------               ------------------------------------

   
                                   THE BERKELEY FINANCIAL GROUP

                                   By: /s/ Susan S. Newton
                                      ---------------------------------------  
                                   Name:   Susan Newton
                                        -------------------------------------  
Dated: September 9, 1994           Title:  Vice President
      --------------------               ------------------------------------


                                   JOHN HANCOCK ADVISERS, INC.

                                   By: /s/ Susan S. Newton
                                      ---------------------------------------  
                                   Name:   Susan Newton
                                        -------------------------------------  
Dated: September 9, 1994           Title:  Vice President
      --------------------               ------------------------------------




                               PAGE 9 OF 9 PAGES


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