SECURITIES AND EXCHANGE COMMISSION
                             WASHINGTON, D.C. 20549


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


                    Under the Securities Exchange Act of 1934

                                  SCHEDULE 13G
                                 Final Amendment

             INFORMATION STATEMENT PURSUANT TO RULES 13d-1 AND 13d-2
                    UNDER THE SECURITIES EXCHANGE ACT OF 1934




                               Active Power, Inc.
                               ------------------
                                (Name of Issuer)



                                  Common Stock
                                  ------------
                         (Title of Class of Securities)



                                    00504W100
                                    ---------
                                 (CUSIP Number)



                                December 31, 2000
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             (Date of Event Which Requires Filing of this Statement)



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

         |X|  Rule 13d-1(b)
         |_|  Rule 13d-1(c)
         |_|  Rule 13d-1(d)


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                                Page 1 of 6 Pages

SCHEDULE 13G CUSIP No. 00504W100 Page 2 of 6 Pages - -------------------------------------------------------------------------------- 1) NAME OF REPORTING PERSON S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON Gilder, Gagnon, Howe & Co. LLC 13-3174112 - -------------------------------------------------------------------------------- 2) CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP (a) |_| (b) |_| - -------------------------------------------------------------------------------- 3) SEC USE ONLY - -------------------------------------------------------------------------------- 4) CITIZENSHIP OR PLACE OF ORGANIZATION New York - -------------------------------------------------------------------------------- NUMBER 5) SOLE VOTING POWER OF None SHARES --------------------------------------------- BENEFICIALLY 6) SHARED VOTING POWER OWNED BY None EACH --------------------------------------------- REPORTING 7) SOLE DISPOSITIVE POWER PERSON None WITH --------------------------------------------- 8) SHARED DISPOSITIVE POWER 1,887,419 - -------------------------------------------------------------------------------- 9) AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON 1,887,419 - -------------------------------------------------------------------------------- 10) CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES |-| - -------------------------------------------------------------------------------- 11) PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (9) 4.9% - -------------------------------------------------------------------------------- 12) TYPE OF REPORTING PERSON BD - -------------------------------------------------------------------------------- -2-

Schedule 13G Item 1(a). Name of Issuer: Active Power, Inc. Item 1(b). Address of Issuer's Principal Executive Offices: 11525 Stonehollow Drive Suite 110 Austin, TX 78758 Item 2(a). Name of Person Filing: Gilder, Gagnon, Howe & Co. LLC Item 2(b). Address of Principal Business Office or, if None, Residence: 1775 Broadway, 26th Floor New York, NY 10019 Item 2(c). Citizenship: New York Item 2(d). Title of Class of Securities: Common Stock Item 2(e). CUSIP Number: 00504W100 Item 3. If this statement is filed pursuant toss.ss.240.13d-1(b), or 240.13d-2(b) or (c), check whether the person filing is a: (a) [x] 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) |_| Investment Adviser in accordance withss.240.13d-1(b)(1)(ii)(E) (f) |_| Employee benefit plan or endowment fund in accordance withss.240.13d-1(b)(1)(ii)(F) -3-

(g) |_| Parent Holding Company or control person in accordance withss.240.13d-1(b)(ii)(G) (h) |_| Savings Association as defined inss.3(b) of the Federal Deposit Insurance Act (12 U.S.C. 1813) (i) |_| Church plan that is excluded from the definition of an investment company under ss.3(c)(15) of the Investment Company Act of 1940 (15 U.S.C. 80a-3) (j) |_| Group, in accordance withss.240.13d-1(b)(ii)(J) Item 4. Ownership. (a) Amount beneficially owned: 1,887,419 (b) Percent of class: 4.9% (c) Number of shares as to which such person has: (i) Sole power to vote or to direct the vote: None (ii) Shared power to vote or to direct the vote: None (iii) Sole power to dispose or to direct the disposition of: None (iv) Shared power to dispose or to direct the disposition of: 1,887,419 Item 5. Ownership of Five Percent or Less of a Class. This statement is being filed to report the fact that as of the date hereof the reporting person has ceased to be beneficial owner of more than five percent of the class of securities. Item 6. Ownership of More than Five Percent on Behalf of Another Person. None Item 7. Identification and Classification of the Subsidiary Which Acquired the Security Being Reported on by the Parent Holding Company. Not applicable -4-

Item 8. Identification and Classification of Members of the Group. Not applicable Item 9. Notice of Dissolution of Group. Not applicable Item 10. Certification. By signing below I certify that, to the best of my 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 purposes or effect. -5-

SIGNATURE After reasonable inquiry and to the best knowledge and belief of the undersigned, the undersigned certifies that the information set forth in this Statement is true, complete and correct. February 5, 2001 -------------------------- Date /s/ Walter Weadock -------------------------- Signature Walter Weadock, Member Name/Title -6-