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SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

SCHEDULE 13G

Under the Securities Exchange Act of 1934
(Amendment No. 2)*

Advanced Energy Industries, Inc.

(Name of Issuer)

Common Stock, $0.001 par value

(Title of Class of Securities)

007973 10 0

(CUSIP Number)

May 1, 2000

(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)

[ ] Rule 13d-1(c)

[X] 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. 007973100                       13G                  Page 2 of 6 Pages



--------------------------------------------------------------------------------
 1    NAME OF REPORTING PERSON.
      I.R.S. IDENTIFICATION NOS. OF ABOVE PERSONS (ENTITIES ONLY).

               G. Brent Backman
--------------------------------------------------------------------------------
 2    CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP (See Instructions)
      (a) [ ]

      (b) [ ]
--------------------------------------------------------------------------------
 3    SEC USE ONLY


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

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

          NUMBER OF                     1,214,782

           SHARES              -------------------------------------------------
                               6     SHARED VOTING POWER
        BENEFICIALLY
                                        0
          OWNED BY
                               ------------------------------------------------
            EACH               7     SOLE DISPOSITIVE POWER

          REPORTING                     1,214,782

           PERSON              ------------------------------------------------
                               8     SHARED DISPOSITIVE POWER
            WITH
                                        0

-------------------------------------------------------------------------------
 9    AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

               1,214,782

--------------------------------------------------------------------------------
10    CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES
      (See Instructions)

      [ ]
--------------------------------------------------------------------------------
11    PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (9)

               3.9%

--------------------------------------------------------------------------------
12    TYPE OF REPORTING PERSON (See Instructions)

               IN

--------------------------------------------------------------------------------


13G Page 3 of 6 Pages

Item 1. (a). Name of Issuer:

Advanced Energy Industries, Inc.

(b). Address of Issuer's Principal Executive Offices:

1625 Sharp Point Drive Fort Collins, CO 80525

Item 2. (a). Name of Person Filing:

G. Brent Backman

(b). Address of Principal Business Office or, if none, Residence:

1625 Sharp Point Drive Fort Collins, CO 80525

(c). Citizenship

United States


                                          13G                 Page 4 of 6 Pages

Item 2.    (d).    Title of Class of Securities:

                   Common Stock, $0.001 par value


           (e).    CUSIP Number:

                   007973 10 0

Item 3. If this statement is filed pursuant to Rule 13d-1(b) or 13d-2(b) or
(c), check whether the person filing is a :

Not applicable

(a) [ ] Broker or dealer registered under section 15 of the Act (15 U.S.C. 78o).

(b) [ ] Bank as defined in section 3(a)(6) of the Act (15 U.S.C 78c).

(c) [ ] Insurance company as defined in section 3(a)(19) of the Act (15 U.S.C. 78c).

(d) [ ] Investment company registered under section 8 of the Investment Company Act of 1940 (15 U.S.C. 80a-8).

(e) [ ] An investment adviser in accordance with Rule 13d-1(b)(1)(ii)(E);

(f) [ ] An employee benefit plan or endowment fund in accordance with Rule 13d-1(b)(1)(ii)(F);

(g) [ ] A parent holding company or control person in accordance with Rule 13d-1(b)(1)(ii)(G)

(h) [ ] A savings association as defined in Section 3(b) of the Federal Deposit Insurance Act (12 U.S.C. 1813);

(i) [ ] A church plan that is excluded from the definition of an investment company under section 3(c)(14) of the Investment Company Act of 1940 (15 U.S.C. 80a-3);

(j) [ ] Group, in accordance with Rule 13d-1(b)(1)(ii)(J).

Item 4. Ownership.

(a). Amount Beneficially Owned:

1,214,782 shares

(b). Percent of Class:

3.9%

(c). Number of shares as to which the person has:

(i) Sole power to vote or to direct the vote 1,214,782.

(ii) Shared power to vote or to direct the vote 0.

(iii) Sole power to dispose or to direct the disposition of 1,214,782.

(iv) Shared power to dispose or to direct the disposition of 0.

The shares reported include 2,500 shares that Mr. Backman has the right to acquire pursuant to an option granted by the issuer.

INSTRUCTION. For computations regarding securities which represent a right to acquire an underlying security SEE Rule 13d3(d)(1).


13G Page 5 of 6 Pages

Item 5. Ownership of Five Percent or Less of a Class:

If this statement is being filed to report the fact that as of the date hereof the reporting person has ceased to be the beneficial owner of more than five percent of the class of securities, check the following. [X]

INSTRUCTION: Dissolution of a group requires a response to this item.

Item 6. Ownership of More than Five Percent on Behalf of Another Person.

Not applicable

Item 7. Identification and Classification of 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


                                           13G                 Page 6 of 6 Pages

Item 9.      Notice of Dissolution of Group:

             Not applicable


Item 10.     Certification:

             Not applicable

(a) The following certification shall be included if the statement is filed pursuant to Rule 13d-1(b):

By signing below I certify that, to the best of my knowledge and belief, the securities referred to above were acquired and are held in the ordinary course of business and 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.

(a) The following certification shall be included if the statement is filed pursuant to Rule 13d-1(c):

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.

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.

2/7/01

Date:

/s/ G. BRENT BACKMAN
------------------------
Signature:

G. Brent Backman
Name/Title: