SCHEDULE 14A INFORMATION

                  Proxy Statement Pursuant to Section 14(a)
           of the Securities Exchange Act of 1934 (Amendment No.  )

Filed by the Registrant [X]

Filed by a Party other than the Registrant [_]

Check the appropriate box:

[_]  Preliminary Proxy Statement

[_]  CONFIDENTIAL, FOR USE OF THE
     COMMISSION ONLY (AS PERMITTED BY
     RULE 14a-6(e)(2))

[X]  Definitive Proxy Statement

[_]  Definitive Additional Materials

[_]  Soliciting Material Pursuant to (S) 240.14a-11(c) or (S) 240.14a-12


                              ACTIVE POWER, INC.
- --------------------------------------------------------------------------------
               (Name of Registrant as Specified In Its Charter)


Payment of Filing Fee (Check the appropriate box):

[X]  No fee required.

[_]  Fee computed on table below per Exchange Act Rules 14a-6(i)(4) and 0-11.


     (1) Title of each class of securities to which transaction applies:


     (2) Aggregate number of securities to which transaction applies:


     (3) Per unit price or other underlying value of transaction computed
         pursuant to Exchange Act Rule 0-11 (Set forth the amount on which
         the filing fee is calculated and state how it was determined):


     (4) Proposed maximum aggregate value of transaction:


     (5) Total fee paid:


[_]  Fee paid previously with preliminary materials.

[_]  Check box if any part of the fee is offset as provided by Exchange
     Act Rule 0-11(a)(2) and identify the filing for which the offsetting fee
     was paid previously. Identify the previous filing by registration statement
     number, or the Form or Schedule and the date of its filing.

     (1) Amount Previously Paid:


     (2) Form, Schedule or Registration Statement No.:


     (3) Filing Party:


     (4) Date Filed:


Notes:








                         [LOGO OF ACTIVE POWER, INC.]

                              ACTIVE POWER, INC.

                      11525 Stonehollow Drive, Suite 110
                              Austin, Texas 78758

                                March 15, 2001

Dear Stockholder:

  You are cordially invited to attend the 2001 Annual Meeting of Stockholders
of Active Power, Inc., which will be held at Renaissance Austin Hotel on
Thursday, April 26, 2001, at 3:00 p.m. Central Daylight Time.

  Details of the business to be conducted at the annual meeting are given in
the accompanying Notice of Annual Meeting of Stockholders and Proxy Statement.

  After careful consideration, our Board of Directors has unanimously approved
the proposal set forth in the Proxy Statement and recommends that you vote in
favor of such proposal and for both of the directors nominated for election to
the Active Power, Inc. Board of Directors.

  You may vote your shares by signing, dating and returning the enclosed proxy
promptly in the accompanying reply envelope. Representation of your shares at
the meeting is very important. Accordingly, whether or not you plan to attend
the meeting, we urge you to submit your proxy promptly by one of the methods
offered. If you are able to attend the annual meeting and wish to change your
proxy vote, you may do so simply by voting in person at the meeting.

                                 Sincerely,
                                 /s/ JOSEPH F. PINKERTON III
                                 Joseph F. Pinkerton, III
                                 President and Chief Executive Officer


                              ACTIVE POWER, INC.

                   NOTICE OF ANNUAL MEETING OF STOCKHOLDERS
                           TO BE HELD APRIL 26, 2001

TO THE STOCKHOLDERS OF ACTIVE POWER, INC.:

  NOTICE IS HEREBY GIVEN that the Annual Meeting of Stockholders of Active
Power, Inc., a Delaware corporation, will be held on Thursday, April 26, 2001,
at 3:00 p.m. Central Daylight Time, at Renaissance Austin Hotel, 9721
Arboretum Blvd., Austin, Texas 78759, for the following purposes, as more
fully described in the Proxy Statement accompanying this Notice:

  1. To elect two Class I directors to serve until our 2004 annual meeting of
     stockholders, or until their successors are duly elected and qualified;

  2.  To ratify the appointment of Ernst & Young LLP as independent auditors
      for our company for the fiscal year ending December 31, 2001; and

  3.  To transact such other business as may properly come before the meeting
      or any adjournment or adjournments thereof.

  Only stockholders of record at the close of business on March 1, 2001 are
entitled to notice of and to vote at the Annual Meeting. Our stock transfer
books will remain open between the record date and the date of the meeting. A
list of stockholders entitled to vote at the Annual Meeting will be available
for inspection at our executive offices.

  All stockholders are cordially invited to attend the meeting in person.
Whether or not you plan to attend, please vote your shares by signing, dating
and returning the enclosed proxy as promptly as possible in the envelope
enclosed for your convenience. Should you receive more than one proxy because
your shares are registered in different names and addresses, each proxy should
be signed and returned to assure that all your shares will be voted. You may
revoke your proxy at any time prior to the Annual Meeting. If you attend the
Annual Meeting and vote by proxy, your proxy will be revoked automatically and
only your vote at the Annual Meeting will be counted.

                                          Sincerely,
                                          /s/ David S. Gino
                                          David S. Gino
                                          Secretary

Austin, Texas
March 15, 2001

YOUR VOTE IS VERY IMPORTANT, REGARDLESS OF THE NUMBER OF SHARES YOU OWN.
PLEASE READ THE ATTACHED PROXY STATEMENT CAREFULLY, AND VOTE YOUR SHARES BY
COMPLETING, SIGNING AND DATING THE ENCLOSED PROXY CARD AS PROMPTLY AS POSSIBLE
AND RETURNING IT IN THE ENCLOSED ENVELOPE.


                              ACTIVE POWER, INC.

                      11525 Stonehollow Drive, Suite 110
                              Austin, Texas 78758

                                PROXY STATEMENT
                    FOR THE ANNUAL MEETING OF STOCKHOLDERS
                         TO BE HELD ON APRIL 26, 2001

General

  The enclosed proxy is solicited on behalf of the Board of Directors of
Active Power, Inc., a Delaware corporation, for use at the Annual Meeting of
Stockholders to be held on April 26, 2001. The annual meeting will be held at
3:00 p.m. Central Daylight Time at Renaissance Austin Hotel, 9721 Arboretum
Blvd, Austin, Texas 78759. These proxy solicitation materials were mailed on
or about March 15, 2001, to all stockholders entitled to vote at our annual
meeting.

Voting

  The specific proposals to be considered and acted upon at our annual meeting
are summarized in the accompanying notice and are described in more detail in
this proxy statement. On March 1, 2001, the record date for determination of
stockholders entitled to notice of and to vote at the annual meeting, we had
outstanding 39,257,420 shares of our common stock and no shares of our
preferred stock. Each stockholder is entitled to one vote for each share of
common stock held by such stockholder on March 1, 2001. Stockholders may not
cumulate votes in the election of directors.

  All votes will be tabulated by the inspector of election appointed for the
meeting, who will separately tabulate affirmative and negative votes,
abstentions and broker non-votes. Abstentions and broker non-votes are counted
as present for purposes of determining the presence or absence of a quorum for
the transaction of business. Abstentions will be counted towards the
tabulations of votes cast on proposals presented to the stockholders and will
have the same effect as negative votes, whereas broker non-votes will not be
counted for purposes of determining whether a proposal has been approved.

Proxies

  If the enclosed form of proxy is properly signed and returned, the shares
represented thereby will be voted at the annual meeting in accordance with the
instructions specified thereon. If you sign and return your proxy without
specifying how the shares represented thereby are to be voted, the proxy will
be voted FOR the election of the director proposed by our board unless the
authority to vote for the election of such director is withheld and, if no
contrary instructions are given, the proxy will be voted FOR the approval of
Proposal 2 described in the accompanying notice and proxy statement. You may
revoke or change your Proxy at any time before the annual meeting by filing
with our Corporate Secretary at our principal executive offices at 11525
Stonehollow Drive, Suite 110, Austin, Texas 78758, a notice of revocation or
another signed proxy with a later date. You may also revoke your proxy by
attending the annual meeting and voting in person.

Solicitation

  We will bear the entire cost of solicitation, including the preparation,
assembly, printing and mailing of this proxy statement, the proxy and any
additional solicitation materials furnished to the stockholders. Copies of
solicitation materials will be furnished to brokerage houses, fiduciaries and
custodians holding shares in their names that are beneficially owned by others
so that they may forward this solicitation material to such beneficial owners.
In addition, we may reimburse such persons for their costs in forwarding the
solicitation materials to such beneficial owners. The original solicitation of
proxies by mail may be supplemented by a solicitation by telephone, telegram
or other means by our directors, officers or employees. No additional
compensation will be paid to these individuals for any such services. We do
not presently intend to solicit proxies other than by mail.


Deadline for Receipt of Stockholder Proposals

  Pursuant to Rule 14a-8 under the Securities Exchange Act of 1934,
stockholder proposals to be presented at our 2002 annual meeting of
stockholders and in our proxy statement and form of proxy relating to that
meeting, must be received by us at our principal executive offices in Austin,
Texas, addressed to our Secretary, not later than October 15, 2001, the date
which is 120 days prior to March 15, 2002. With respect to any stockholder
proposal not submitted pursuant to Rule 14a-8 and unless notice is received by
us in the manner specified in the previous sentence, persons acting as proxies
shall have discretionary authority to vote against any proposal presented at
our 2002 annual meeting of stockholders. These proposals must comply with
applicable Delaware law, the rules and regulations promulgated by the
Securities and Exchange Commission and the procedures set forth in our bylaws.

                                       2


                  MATTERS TO BE CONSIDERED AT ANNUAL MEETING
                      PROPOSAL ONE: ELECTION OF DIRECTORS

General

  Our certificate of incorporation provides that our board of directors be
divided into three classes of directors, as nearly equal in size as
practicable, and each of which will serve staggered three-year terms or until
his or her successor has been duly elected and qualified. At this annual
meeting, we will be electing two Class I directors whose terms will expire at
our 2004 annual meeting. Our board currently consists of six persons. Both of
the nominees listed below are current directors.

  Both nominees for election have agreed to serve if elected, and management
has no reason to believe that the nominees will be unavailable to serve. In
the event a nominee is unable or declines to serve as a director at the time
of the annual meeting, the proxies will be voted for any nominee who may be
designated by our present board of directors to fill the vacancy. Unless
otherwise instructed, the proxy holders will vote the proxies received by them
FOR the nominees named below.

Nominees for Director

  The following table sets forth the name, age and current position of each
person who is a nominee for election as one of our directors:



                                                                  Proposed Class
      Name                                   Age Current Position  of Director
      ----                                   --- ---------------- --------------
                                                         
      Richard E. Anderson...................  36     Director        Class I

      Rodney S. Bond........................  56     Director        Class I


                        Nominees for Class I Directors

  Richard E. Anderson, 36, has served as a member of our Board of Directors
since 1992. In 1992, Mr. Anderson co-founded Hill Partners, Inc., a real
estate development and investment company, where he currently serves as
partner. Mr. Anderson holds a B.A. in economics from Southern Methodist
University.

  Rodney S. Bond, 56, has served as a member of our Board of Directors since
September 1994. From May 1990 to October 2000, Mr. Bond served in various
capacities with VTEL Corporation, a public digital video communications
company, including as Vice President, Chief Strategic Officer and Vice
President, Chief Financial Officer. Mr. Bond is currently a principal serving
as a financial and strategic planning consultant at Sherman Partners in
Austin, Texas. Mr. Bond holds a B.S. in metallurgical engineering from the
University of Illinois and a M.B.A. from Northwestern University.

Other Directors

  Set forth below is information concerning our other directors whose term of
office continues after this annual meeting.

 Class II Directors Whose Terms Expire at the 2002 Annual Meeting of
Stockholders.

  Jan H. Lindelow, 55, has served as a member of our Board of Directors since
February 1998. Mr. Lindelow is currently the chairman of Tivoli Systems, Inc.
Since May 1997, he has served in various other capacities at Tivoli, including
as president, chief operating officer and chief executive officer. From
January 1995 to April 1997, he was a self-employed management consultant. From
1988 to June 1994, Mr. Lindelow worked in various capacities at Asea Brown
Boveri AG. Mr. Lindelow holds an M.S. in electrical engineering from the Royal
Institute of Technology in Stockholm, Sweden.

                                       3


  Terrence L. Rock, 54, has served as a member of our Board of Directors since
1997. Since 1996, Mr. Rock has served as a partner with CenterPoint Venture
Partners. From 1983 to 1996, Mr. Rock worked for Convex Computer Corporation
holding various positions, including President and Vice President of
Operations. Mr. Rock also serves on the board at several private companies.
Mr. Rock holds a B.S. in mechanical engineering from South Dakota School of
Mines and Technology.

 Class III Directors Whose Terms Expire at the 2003 Annual Meeting of
Stockholders.

  Eric L. Jones, 65, has served as the Chairman of the Board of Directors
since March 1995. Since April 1994, he has been a partner with SSM Venture
Partners, L.P., an Austin, Texas-based venture capital firm. Mr. Jones is
currently a director/chairman of several private companies including 360
Commerce, eTopware, Motive Communications and NetBotz. He is also the past
chairman of the board of directors of VTEL Corporation and Tivoli Systems,
both of which became public companies during his tenure. During a 25 year
career at Texas Instruments, Mr. Jones managed Fortune 500-sized business
units as a corporate vice president and group president. Mr. Jones holds a
Ph.D. in mechanical engineering from the University of Texas at Austin.

  Joseph F. Pinkerton, III, 37, our founder, has served as our Chief Executive
Officer, President and member of our Board of Directors since August 1992.
Prior to founding Active Power, from June 1989 to June 1992, Mr. Pinkerton was
a principal with Fundamental Research Corporation, a private research and
development company in Walled Lake, Michigan. Mr. Pinkerton holds numerous
U.S. and foreign patents. Mr. Pinkerton holds a B.A. in physics from Albion
College, in association with Columbia University.

Board Committees and Meetings

  In 2000, our board of directors held eleven (11) meetings and acted by
unanimous written consent two (2) times including meetings held by the board
of directors of our predecessor Texas company. The board of directors has an
audit committee and a compensation committee. Each director attended or
participated in 75% or more of the aggregate of (i) the total number of
meetings of the board of directors and (ii) the total number of meetings held
by all committees of the board on which such director served during fiscal
2000.

  Audit Committee. The audit committee reports to the board of directors with
regard to the selection of our independent auditors, the scope of our annual
audits, fees to be paid to the auditors, the performance of our independent
auditors, compliance with our accounting and financial policies, and
management's procedures and policies relative to the adequacy of our internal
accounting controls. The members of the audit committee are Messrs. Bond,
Lindelow and Rock. The audit committee held two (2) meetings during fiscal
2000.

  Our board adopted and approved an amended charter for the audit committee in
March, 2001, a copy of which is attached hereto as Appendix A. The board has
determined that all members of the audit committee are "independent" as that
term is defined in Rule 4200 of the listing standards of the National
Association of Securities Dealers.

  Compensation Committee. The compensation committee reviews and makes
recommendations to the board regarding our compensation policies and all forms
of compensation to be provided to our directors, executive officers and
certain other employees. In addition, the compensation committee reviews bonus
and stock compensation arrangements for all of our other employees. The
compensation committee also administers our stock option and stock purchase
plans. The members of the compensation committee are Messrs. Anderson,
Lindelow and Rock. The compensation committee held twelve (12) meetings during
fiscal 2000.

Director Compensation and Indemnification Arrangements

  Each of our non-employee directors receives a fee of $5,000 per quarter for
his service as a director. In addition, non-employee directors receive option
grants at periodic intervals under the automatic option grant program of our
2000 Stock Incentive Plan. Non-employee and employee directors are also
eligible to receive

                                       4


option grants under the discretionary option grant program of the 2000 plan.
Under the automatic option grant program, each individual who first becomes a
non-employee board member at any time after our initial public offering
receives an option grant to purchase 25,000 shares of common stock on the date
such individual joins the board. In addition, on the date of each annual
stockholders meeting held after our initial public offering, each non-employee
board member who continues to serve as a non-employee board member is
automatically granted an option to purchase 7,500 shares of common stock,
provided such individual has served on the board for at least six months.

  Our certificate of incorporation limits the liability of our directors to us
or our stockholders for breaches of the directors' fiduciary duties to the
fullest extent permitted by Delaware law. In addition, our certificate of
incorporation and bylaws provide for mandatory indemnification of directors
and officers to the fullest extent permitted by Delaware law. We also maintain
directors' and officers' liability insurance and enter into indemnification
agreements with all of our directors and executive officers.

Recommendation of the Board of Directors

  The Board of Directors recommends that the stockholders vote FOR the
election of both of the nominees listed above.

                                       5


              PROPOSAL TWO: RATIFICATION OF INDEPENDENT AUDITORS

  Our board of directors appointed the firm of Ernst & Young LLP, independent
auditors for the fiscal year ended December 31, 2000 and has appointed Ernst &
Young LLP to serve in the same capacity for the fiscal year ending December
31, 2001. Fees for the last annual audit were $54,000 and all other fees were
$270,000, including audit related services of $260,000 and non-audit related
services of $10,000. Audit related services primarily related to the
preparation of registration statements filed with the Securities and Exchange
Commission. We did not engage Ernst & Young LLP to provide advice to Active
Power regarding financial information systems design and implementation during
fiscal 2000. The board is asking the stockholders to ratify this appointment.
The affirmative vote of a majority of the shares represented and voting at the
annual meeting is required to ratify the selection of Ernst & Young LLP.

  In the event the stockholders fail to ratify the appointment, our board will
reconsider its selection. Even if the selection is ratified, the board in its
discretion may direct the appointment of a different independent auditing firm
at any time during the year if the board believes that such a change would be
in the best interests of the company and our stockholders.

  A representative of Ernst & Young LLP is expected to be present at the
annual meeting, will have the opportunity to make a statement if he or she
desires to do so, and will be available to respond to appropriate questions.

Recommendation of the Board of Directors

  Our board of directors recommends that the stockholders vote FOR the
ratification of the selection of Ernst & Young LLP to serve as our independent
auditors for the fiscal year ending December 31, 2001.

                                 OTHER MATTERS

  We know of no other matters that will be presented for consideration at the
annual meeting. If any other matters properly come before the annual meeting,
it is the intention of the persons named in the enclosed form of proxy to vote
the shares they represent as our board of directors may recommend.
Discretionary authority with respect to such other matters is granted by the
execution of the enclosed proxy.

                                       6


                            OWNERSHIP OF SECURITIES

  The following table sets forth certain information known to us with respect
to the beneficial ownership of our common stock as of March 1, 2001, by:

  .   each person known by us to be a beneficial owners of five percent (5%)
      or more of our common stock;

  .   each current director, each of whom is a nominee for election as a
      director;

  .   each executive officer named in the summary compensation table of the
      Executive Compensation and Other Information section of this proxy
      statement; and

  .   all current directors and executive officers as a group.

  Beneficial ownership is determined in accordance with the rules of the
Securities and Exchange Commission and includes voting and investment power
with respect to the securities. Except as indicated in the notes following the
table, and subject to applicable community property laws, the persons named in
the table have sole voting and investment power with respect to all shares of
common stock shown as beneficially owned by them. The number of shares of
common stock used to calculate the percentage ownership of each listed person
includes shares of common stock underlying options or warrants held by such
persons that are exercisable within 60 days of March 1, 2001. The percentage
of beneficial ownership before the offering is based on 39,257,420 shares of
common stock outstanding as of March 1, 2001.

  Our common stock is the only class of voting securities outstanding. Unless
otherwise indicated, each of the stockholders has sole voting and investment
power with respect to the shares beneficially owned, subject to community
property laws, where applicable.



                                                                    Percentage
                                                         Shares     of Shares
                                                      Beneficially Beneficially
                  Beneficial Owner                       Owned        Owned
                  ----------------                    ------------ ------------

                                                             
Executive Officers and Directors:
  Eric L. Jones......................................    758,087        1.9%
  Joseph F. Pinkerton, III...........................  5,900,726       15.0
  David S. Gino......................................    472,500        1.2
  James A. Balthazar.................................    285,970          *
  William E. Ott, II.................................    269,340          *
  Richard E. Anderson................................    353,609          *
  Rodney S. Bond.....................................     58,590          *
  Jan H. Lindelow....................................     93,680          *
  Terrence L. Rock...................................     63,159          *
  All current directors and executive officers as a
   group (9 persons).................................  8,255,661       21.0

- --------
*  Less than one percent of the outstanding common stock

  Unless otherwise indicated, the address for all officers and directors is
c/o Active Power, Inc., 11525 Stonehollow Drive, Suite 110, Austin, Texas
78758.

  . Eric L. Jones. 433,268 shares indicated as owned by Mr. Jones are
    included because of his association with funds affiliated with SSM
    Venture Partners. Mr. Jones is a shareholder of SSM Corporation, the
    general partner of SSM I, L.P., the general partner of (a) SSM Venture
    Partners, L.P., (b) SSM Partners II, L.P. and (c) SSM Venture Associates,
    L.P. Mr. Jones disclaims beneficial ownership of the shares held by SSM
    Venture Partners, L.P., SSM Venture Partners II, L.P. and SSM Venture
    Associates, L.P., except to the extent of his interest in SSM
    Corporation. Additionally, 38,880 of the shares indicated as owned by Mr.
    Jones are included because of his position as a trustee of various trusts
    for the benefit of his family members. Mr. Jones disclaims beneficial
    ownership of these shares. Mr. Jones' address is c/o SSM Corporation, 110
    Wild Basin Rd., Suite 280, Austin, Texas 78734.

                                       7


  . Joseph F. Pinkerton, III. Includes immediately exercisable options to
    purchase 70,500 shares of common stock, none of which were vested as of
    March 1, 2001. In addition, 554,000 of the shares indicated as owned by
    Mr. Pinkerton are held by the Joe Pinkerton GRAT for children and the
    Claire Pinkerton GRAT for children. Both trusts are for the benefit of
    Mr. Pinkerton's minor children. Mr. Pinkerton disclaims beneficial
    ownership of the 554,000 shares held in the trusts.

  . David S. Gino. 104,993 shares indicated as owned by Mr. Gino are subject
    to a right of repurchase in favor of us which lapses over time. These
    shares also include immediately exercisable options to purchase 232,507
    shares of common stock, none of which were vested as of March 1, 2001.

  . James A. Balthazar. Includes immediately exercisable options to purchase
    57,170 shares of common stock, 8,455 shares of which were vested as of
    March 1, 2001.

  . William E. Ott, II. Includes immediately exercisable options to purchase
    174,940 shares of common stock, 77,287 shares of which were vested as of
    March 1, 2001.

  . Richard E. Anderson. 86,400 shares indicated as owned by Mr. Anderson are
    included because of his association with Rita Investments. Mr. Anderson
    also holds 100,000 shares, or 23.8%, of our non-voting 1992 preferred
    stock, which is not convertible into shares of our common stock. These
    shares of 1992 preferred stock are not included in the foregoing table.
    Mr. Anderson's address is c/o Hill Partners, 2800 Industrial Terrace,
    Austin, Texas 78758.

  . Rodney S. Bond. Includes immediately exercisable options to purchase
    27,000 shares of common stock, all of which are vested. Mr. Bond's
    address is c/o VTEL Corporation, 108 Wild Basin Road, Austin, Texas
    78746.

  . Jan H. Lindelow. Includes immediately exercisable options to purchase
    43,200 shares of common stock, all of which are vested. Mr. Lindelow's
    address is c/o Tivoli Systems, 9442 Capital of Texas Highway North,
    Austin, Texas 78759.

  . Terrence L. Rock. Mr. Rock's address is c/o CenterPoint Venture Partners,
    13455 Noel Road, Suite 1670, Two Galleria Tower, Dallas, Texas 75240.

                                       8


                             RELATED TRANSACTIONS

  Registration rights. According to the terms of an investors' rights
agreement, some of our stockholders, including our chief executive officer,
Joseph F. Pinkerton, III, may require us to file a registration statement
under the Securities Act of 1933 with respect to the resale of their shares.
We are not required to effect more than two of these demand registrations.
Holders of demand registration rights may require us to file an unlimited
number of registration statements on Form S-3 with respect to their shares of
common stock.

  Additionally, some of our stockholders, including our chief executive
officer, have piggyback registration rights with respect to future
registration of our shares of common stock under the Securities Act. If we
propose to register any shares of common stock under the Securities Act, the
holders of shares having piggyback registration rights are entitled to receive
notice of such registration and are entitled to include their shares in the
registration.

  At any time after we become eligible to file a registration statement on
Form S-3 under the Securities Act, holders of demand registration rights may
require us to file up to six registration statements on Form S-3 with respect
to their shares of common stock, resulting in an aggregate offering of at
least $500,000 on each registration statement on Form S-3. We are not required
to file more than one registration statement on Form S-3 in any one six-month
period.

  These registration rights are subject to conditions and limitations,
including the right of the underwriters of an offering to limit the number of
shares of common stock to be included in the registration. We are generally
required to bear all of the expenses of all registrations under the investors'
rights agreement, except underwriting discounts and commissions incurred by
the selling stockholders. The investors' rights agreement also contains our
commitment to indemnify the holders of registration rights for losses they
incur in connection with registrations under the agreement. Registration of
any of the shares of common stock held by security holders with registration
rights would result in those shares becoming freely tradeable without
restriction under the Securities Act.

  Stock options granted to executive officers and directors. For more
information regarding the grant of stock options to executive officers and
directors in fiscal 2000, please see "Director Compensation and
Indemnification Arrangements" above and "Option Grants in Fiscal 2000" below.

  Employment agreements. For information regarding the employment agreements
we have with Joseph F. Pinkerton, III, and David S. Gino, please see
"Employment Contracts, Termination of Employment and Change in Control
Agreements" below.

  Consulting Agreement with Eric L. Jones. In May 1996, we entered into a
consulting services agreement with Eric Jones, the chairman of our board of
directors. In exchange for providing business and strategic advisory
consulting services to us, Mr. Jones receives a fee of $6,250 per month. This
agreement is terminable by either party with 30 days advance written notice.

  Indemnification and Insurance. Our bylaws require us to indemnify our
directors and executive officers to the fullest extent permitted by Delaware
law. We have entered into indemnification agreements with all of our directors
and executive officers and have purchased directors' and officers' liability
insurance. In addition, our certificate of incorporation limits the personal
liability of our board members for breaches of their fiduciary duties.

                                       9


                            AUDIT COMMITTEE REPORT

  The Audit Committee reports as follows with respect to the audit of our
fiscal 2000 audited financial statements:

  Management is responsible for Active Power's internal controls and the
financial reporting process. The independent auditors are responsible for
performing an independent audit of Active Power's financial statements in
accordance with auditing standards generally accepted in the United States and
to issue a report thereon. The Committee's responsibility is to monitor and
oversee these processes.

  In this context, the Committee has met and held discussions with management
and the independent auditors. Management represented to the Committee that
Active Power's consolidated financial statements were prepared in accordance
with accounting principles generally accepted in the United States, and the
Committee has reviewed and discussed the financial statements with management
and the independent auditors. The Committee discussed with the independent
auditors matters required to be discussed by Statement on Auditing Standards
No. 61 (Communication with Audit Committees).

  Active Power's independent auditors also provided to the Committee the
written disclosures required by Independence Standards Board Standard No. 1
(Independence Discussions with Audit Committees), and the Committee discussed
with the independent auditors that firm's independence and considered the
compatibility of non-audit services with the independent auditors'
independence.

  Based upon the Committee's discussion with management and the independent
auditors and the Committee's review of the representation of management and
the report of the independent auditors to the Committee, the Committee
recommended that the board of directors include the audited financial
statements in Active Power's Annual Report on Form 10-K for the year ended
December 31, 2000 filed with the Securities and Exchange Commission.

                                          Rodney S. Bond
                                          Jan H. Lindelow
                                          Terrence L. Rock

                                      10


                 EXECUTIVE COMPENSATION AND OTHER INFORMATION

Summary of Cash and Certain Other Compensation

  The following table provides certain summary information concerning the
compensation earned, by our Chief Executive Officer and each of the three
other most highly compensated executive officers whose salary and bonus for
fiscal 2000 was in excess of $100,000, for services rendered in all capacities
to the company for the fiscal years ended December 31, 1998, 1999 and 2000.

                          SUMMARY COMPENSATION TABLE




                                                                    Long-Term
                                                        Annual     Compensation
                                                     Compensation     Awards
                                                    -------------- ------------
                                                                    Securities
                                             Fiscal Salary  Bonus   Underlying
        Name and Principal Position           Year    ($)    ($)    Options (#)
        ---------------------------          ------ ------- ------ ------------
                                                       
Joseph F. Pinkerton, III....................  2000  244,524 90,000       --
 President and Chief Executive Officer        1999  157,308 50,000       --
                                              1998  140,000    --        --

David S. Gino (1)...........................  2000  194,376 60,000       --
 Vice President of Finance and Chief          1999   13,982    --    432,000
  Financial Officer

James A. Balthazar..........................  2000  136,646 35,000       --
 Vice President of Marketing                  1999  128,750    254    15,120
                                              1998  125,000    303       --

William E. Ott, II..........................  2000  146,341 60,000       --
 Vice President of Sales and Service          1999  123,600 25,499    28,080
                                              1998  120,000 36,303       --

- --------
(1) Mr. Gino joined us as our Vice President of Finance and Chief Financial
    Officer in December 1999.

                                      11


                     OPTION/SAR GRANTS IN LAST FISCAL YEAR

  We did not make any grants of stock options or stock appreciation rights
during fiscal 2000 to our executive officers named in the Summary Compensation
Table.

Fiscal Year-end Option Values

  The following table provides information about stock options exercised in
fiscal 2000 and options held as of December 31, 2000 by each of our executive
officers named in the Summary Compensation Table. No stock appreciation rights
were exercised during fiscal 2000 and none were outstanding at December 31,
2000. Actual gains on exercise, if any, will depend on the value of our common
stock on the date on which the shares are sold.

                           FISCAL 2000 OPTION VALUES



                                                   Number Of Securities
                          Shares                  Underlying Unexercised    Value of Unexercised In-
                         Acquired                       Options At            the-money Options At
                            On                      December 31, 2000(#)(2)December 31, 2000($)(2)(3)
                         Exercise     Value      ------------------------- -----------------------------
                           (#)    Realized($)(1) Exercisable Unexercisable Exercisable    Unexercisable
                         -------- -------------- ----------- ------------- -------------  --------------
                                                                        
Joseph F. Pinkerton,
 III....................     --           --          --            --                --              --
David S. Gino........... 239,993    5,065,652         --        192,007               --        4,052,787
James A. Balthazar...... 334,850    7,310,835       8,455        28,215           183,266         604,473
William E. Ott..........  86,400    1,881,576      77,287        77,153         1,676,940       1,661,667

- --------
(1)   The value realized of shares acquired on exercise was determined by
      subtracting the exercise price from the fair market value of the common
      stock on the exercise date multiplied by the number of shares acquired
      on exercise.
(2)   Options granted under our 2000 Stock Incentive Plan and its predecessor
      plan are immediately exercisable. "Exercisable" refers to those options
      which were both exercisable and vested while "unexercisable" refers to
      those options which were unvested.
(3)   Value is determined by subtracting the exercise price from the fair
      market value of our common stock at December 29, 2000 ($21.9375 per
      share based upon the closing sale price of our common stock on the
      Nasdaq National Market on such date) and multiplying by the number of
      shares underlying the options.

Employment Contracts, Termination of Employment and Change in Control
Arrangements

  The Company has termination of employment and change in control arrangements
in place with Joseph F. Pinkerton, III and David S. Gino. Mr. Pinkerton will
receive six months of severance pay if he is terminated without cause, which
would result in a severance payment of $137,500 based on Mr. Pinkerton's
current salary. Additionally, if after six months of an inability to perform
his duties due to a permanent disability Mr. Pinkerton is terminated, he will
receive three months of severance pay, which would result in a severance
payment of $68,750 based on Mr. Pinkerton's current salary. Upon a change in
corporate control that results in a significant reduction in Mr. Gino's role
and/or responsibility within 12 months of the change in corporate control, Mr.
Gino will receive up to six months of severance pay, which would result in a
severance payment of $107,500 based on Mr. Gino's current salary.
Additionally, 75% of his then unvested options will accelerate and vest
immediately.

  Our 2000 Stock Incentive Plan, which governs the options granted to the
named executive officers, includes the following change in control provisions
which may result in the accelerated vesting of outstanding option grants and
stock issuances:

  . In the event that we are acquired by merger or asset sale or board-
    approved sale by the stockholders of more than 50% of our outstanding
    voting stock, each outstanding option under the discretionary option
    grant program which is not to be assumed by the successor corporation or
    otherwise continued in effect

                                      12


    will immediately become exercisable for all the option shares, and all
    outstanding unvested shares will immediately vest, except to the extent
    our repurchase rights with respect to those shares are to be assigned to
    the successor corporation or otherwise continued in effect.

  . The compensation committee will have complete discretion to grant one or
    more options that will become exercisable for all the option shares in
    the event those options are assumed in the acquisition and the optionee's
    service with us or the acquiring entity is subsequently involuntarily
    terminated. The vesting of any outstanding shares under our 2000 plan may
    be accelerated upon similar terms and conditions.

  . The compensation committee may grant options and structure repurchase
    rights so that the shares subject to those options or repurchase rights
    will immediately vest in connection with a hostile take-over effected
    through a successful tender offer for more than 50% of our outstanding
    voting stock or a change in the majority of our board through one or more
    contested elections. Such accelerated vesting may occur either at the
    time of such transaction or upon the subsequent termination of the
    optionee's services.

  . The options currently outstanding under our 1993 Stock Option/Stock
    Issuance Plan, which was succeeded by the 2000 plan, will immediately
    vest in the event we are acquired by merger or asset sale, unless those
    options are assumed by the acquiring entity or our repurchase rights with
    respect to any unvested shares subject to those options are assigned to
    such entity. If the options are so assumed by the acquiring entity and
    our repurchase rights are so assigned to such entity, then no accelerated
    vesting will occur at the time of the acquisition but the options will
    accelerate and vest in full upon an involuntary termination of the
    optionee's employment within 18 months following the acquisition.

Compensation Committee Interlocks and Insider Participation

  None of our executive officers serves as a member of the board of directors
or compensation committee of any entity that has one or more of its executive
officers serving as a member of our board of directors or compensation
committee. Our compensation committee currently consists of Messrs. Anderson,
Lindelow and Rock, none of whom currently serves or has previously served as
an officer or employee of our company.

                                      13


Board Compensation Committee Report on Executive Compensation

  It is the duty of the compensation committee to review and determine the
salaries and bonuses of executive officers of Active Power, including the
Chief Executive Officer, and to establish the general compensation policies
for such individuals. The compensation committee also has the sole and
exclusive authority to make discretionary option grants to the company's
executive officers under our 2000 Stock Incentive Plan.

  The compensation committee believes that the compensation programs for the
company's executive officers should reflect Active Power' performance and the
value created for Active Power' stockholders. In addition, the compensation
programs should support the short-term and long-term strategic goals and
values of the company and should reward individual contribution to Active
Power' success. Active Power is engaged in a very competitive industry, and
the company's success depends upon its ability to attract and retain qualified
executives through the competitive compensation packages it offers to such
individuals.

  General Compensation Policy. The compensation committee's policy is to
provide the company's executive officers with compensation opportunities which
are based upon their personal performance, the financial performance of the
company and their contribution to that performance and which are competitive
enough to attract and retain highly skilled individuals. Each executive
officer's compensation package is comprised of three elements: (i) base salary
that is competitive with the market and reflects individual performance, (ii)
annual variable performance awards payable in cash and tied to the company's
achievement of annual financial, strategic and operational objectives in
addition to individual contributions to these objectives and (iii) long-term
stock-based incentive awards designed to strengthen the mutual interest of
Active Power's executive officers and its stockholders.

  Factors. The principal factors that were taken into account in establishing
each executive officer's compensation package for fiscal 2000 are described
below. However, the compensation committee may in its discretion apply
entirely different factors, such as different measures of financial
performance, for future fiscal years.

  Base Salary. In setting base salaries, the compensation committee reviewed
published compensation survey data for its industry. Specifically, the
Committee considered an October 2000 report by the Watson Wyatt Worldwide
consulting firm, entitled Executive Compensation Review and Stock Option
Modeling Report. The base salary for each officer reflects the salary levels
for comparable positions in the published surveys and the comparative group of
companies, as well as the individual's personal performance and internal
alignment considerations. The relative weight given to each factor varies with
each individual in the sole discretion of the compensation committee. Each
executive officer's base salary is adjusted each year on the basis of (i) the
compensation committee's evaluation of the officer's personal performance for
the year and (ii) the competitive marketplace for persons in comparable
positions. Active Power' performance may also be a factor in determining the
base salaries of executive officers.

  Annual Incentives. In setting bonus amounts to executive officers, the
compensation committee looks to external market data to assemble competitive
variable compensation levels in competitive companies and markets. Based on
the foregoing factors and the company's performance for fiscal 2000, bonuses
were awarded to the executive officers named in the Summary Compensation Table
in the indicated amounts.

  Long-Term Incentives. Generally, stock option grants are made annually by
the compensation committee to each of the company's executive officers. Each
grant is designed to align the interests of the executive officer with those
of the stockholders and provide each individual with a significant incentive
to manage Active Power from the perspective of an owner with an equity stake
in the business. Each grant allows the officer to acquire shares of the
company's common stock at a fixed price per share (typically, the market price
on the grant date) over a specified period of time (up to ten years). Each
option becomes exercisable in a series of installments over a four-year
period, contingent upon the officer's continued employment with Active Power.
Accordingly,

                                      14


the option will provide a return to the executive officer only if he or she
remains employed by the company during the vesting period, and then only if
the market price of the shares appreciates over the option term.

  The size of the option grant to each executive officer is set by the
compensation committee at a level that is intended to create a meaningful
opportunity for stock ownership based upon the individual's current position
with the company, the individual's personal performance in recent periods and
his or her potential for future responsibility and promotion over the option
term. The compensation committee also takes into account the number of
unvested options held by the executive officer in order to maintain an
appropriate level of equity incentive for that individual. The relevant weight
given to each of these factors varies from individual to individual. The
compensation committee has established certain guidelines with respect to the
option grants made to the executive officers, but has the flexibility to make
adjustments to those guidelines at its discretion.

  CEO Compensation. In setting the total compensation payable to our Chief
Executive Officer, Joseph F. Pinkerton III, in fiscal 2000, the compensation
committee has taken into consideration Mr. Pinkerton's prior accomplishments
and strategic leadership in our industry and also sought to make that
compensation competitive with the compensation paid to the chief executive
officers of comparable companies. Additionally, the compensation committee
looked to Active Power' performance and stock price appreciation for a
significant percentage of his total compensation.

  Employee Stock Purchase Plan. We maintain an employee stock purchase plan
that qualifies under Section 423 of the Internal Revenue Code and permits
substantially all of our U.S. employees to purchase shares of our common
stock. Participating employees may purchase our common stock at a purchase
price equal to 85% of the lower of the fair market value of our common stock
at the beginning of an offering period or on the exercise date. Employees may
designate up to 15% of their base compensation for the purchase of our common
stock under this plan. Active Power' executive officers are eligible to
participate in this program, subject to any applicable tax laws.

  Retirement Plans. We maintain a plan that complies with the provisions of
Section 401(k) of the Internal Revenue Code. Substantially all U.S. employees
are eligible to participate in this plan, and eligibility for participation
commences upon hiring. We also maintain retirement plans for certain non-U.S.
employees. Obligations under these plans are determined in accordance with
local regulations and customs. Active Power' executive officers are eligible
to participate in this program, subject to any applicable tax laws.

  Compliance with Internal Revenue Code Section 162(m). Section 162(m) of the
Internal Revenue Code disallows a tax deduction to publicly held companies for
compensation paid to certain of their executive officers, to the extent that
compensation exceeds $1 million per covered officer in any fiscal year. The
limitation applies only to compensation that is not considered to be
performance-based. Active Power' 2000 Stock Incentive Plan has been structured
so that any compensation deemed paid in connection with the exercise of option
grants made under that plan with an exercise price equal to the fair market
value of the option shares on the grant date will qualify as performance-based
compensation which will not be subject to the $1 million limitation. Cash and
other non-performance based compensation paid to Active Power' executive
officers for fiscal 2000 did not exceed the $1 million limit per officer, and
the compensation committee does not anticipate that the non-performance based
compensation to be paid to the company's executive officers will exceed that
limit. Because it is unlikely that the cash compensation payable to any of the
company's executive officers in the foreseeable future will approach the $1
million limit, the compensation committee has decided at this time not to take
any action to limit or restructure the elements of cash compensation payable
to the company's executive officers. The compensation committee will
reconsider this decision should the individual cash compensation of any
executive officer ever approach the $1 million level.

  It is the opinion of the compensation committee that the executive
compensation policies and plans provide the necessary total remuneration
program to properly align the company's performance and the interests of
Active Power' stockholders through the use of competitive and equitable
executive compensation in a balanced and reasonable manner, for both the short
and long-term.

  Submitted by the compensation committee of the board of directors:

                                       Richard E. Anderson
                                       Jan H. Lindelow
                                       Terrence L. Rock

                                      15


Stock Performance Graph

  The graph depicted below shows a comparison of cumulative total stockholder
returns for an investment in our common stock, the Nasdaq Stock Market Index
and the CIBC Power Technology & Growth Index.


                             [GRAPH APPEARS HERE]

                           COMPARISON OF CUMULATIVE TOTAL RETURN
                      ------------------------------------------------
                      8/7/00   8/31/00   9/30/00   11/30/00   12/31/00
                      ------   -------   -------   --------   --------
CIBC World Markets
 Power Technology &
 Growth Index          100     130.18    140.86      77.29      90.84
NASDAQ Composite       100     108.89     95.08      67.25      63.95
Active Power           100     413.23    364.70      80.51     129.04


(1) The graph covers the period from August 7, 2000, the first date on which
    our common stock began trading following our initial public offering of
    shares of our common stock, to December 31, 2000.

(2) The graph assumes that $100 was invested in our common stock on August 7,
    2000 at our initial public offering price of $17.00 per share and in each
    index, and that all dividends were reinvested. No cash dividends have been
    declared on our common stock.

(3) Stockholder returns over the indicated period should not be considered
    indicative of future stockholder returns.

                                      16


   NO INCORPORATION BY REFERENCE OF CERTAIN PORTIONS OF THIS PROXY STATEMENT

  Notwithstanding anything to the contrary set forth in any of our previous
filings made under the Securities Act of 1933, as amended, or the Securities
Exchange Act of 1934, as amended, that might incorporate future filings made
by us under those statutes, neither the preceding Stock Performance Graph, the
audit committee report nor the compensation committee report is to be
incorporated by reference into any such prior filings, nor shall such graph or
report be incorporated by reference into any future filings made by us under
those statutes.

     COMPLIANCE WITH SECTION 16(a) OF THE SECURITIES EXCHANGE ACT OF 1934

  The members of our board of directors, our executive officers and persons
who hold more than 10% of our outstanding common stock are subject to the
reporting requirements of Section 16(a) of the Securities Exchange Act of
1934, which require them to file reports with respect to their ownership of
our common stock and their transactions in such common stock. Based upon (i)
the copies of Section 16(a) reports we received from such persons for their
fiscal 2000 transactions in our common stock and their common stock holdings,
and (ii) the written representations received from one or more of such persons
that no other reports were required to be filed by them for fiscal 2000, we
believe that all reporting requirements under Section 16(a) for fiscal 2000
were met in a timely manner by our directors, executive officers and greater
than ten percent beneficial owners.

                                 ANNUAL REPORT

  A copy of our Annual Report to Stockholders for fiscal 2000 has been mailed
concurrently with this proxy statement to all stockholders entitled to notice
of and to vote at the annual meeting. The annual report is not incorporated
into this proxy statement and is not considered proxy solicitation material.

                          ANNUAL REPORT ON FORM 10-K

  We filed an Annual Report on Form 10-K with the Securities and Exchange
Commission on March 15, 2001. Stockholders may obtain a copy of this report,
without charge, by writing to the attention of Investor Relations, at our
principal executive offices located at 11525 Stonehollow Drive, Suite 110,
Austin, Texas 78758.

                                   THE BOARD OF DIRECTORS OF ACTIVE POWER, INC.

Dated: March 15, 2001

                                      17


                                                                     Appendix A

                          SECOND AMENDED AND RESTATED

                        CHARTER OF THE AUDIT COMMITTEE

                                      OF

                              ACTIVE POWER, INC.

PURPOSE

  The primary function of the Audit Committee is to assist the Board of
Directors in fulfilling its oversight responsibilities by reviewing the
financial information which will be provided to the stockholders and others,
the systems of internal controls which management and the Board of Directors
have established, and the Corporation's audit and financial reporting
processes.

  The Corporation's independent auditors' ultimate accountability is to the
Board of Directors and the Audit Committee, as representatives of
stockholders. The Audit Committee, as such representatives, has the ultimate
authority and responsibility to select, evaluate, and, where appropriate,
replace the independent auditors (or to nominate the independent auditors to
be proposed for stockholder ratification in any proxy statement).

  The Audit Committee's primary duties and responsibilities are to:

  1. Oversee that management has maintained the reliability and integrity of
     the accounting policies and financial reporting and disclosure practices
     of the Corporation.

  2. Oversee that management has established and maintained processes to
     assure that an adequate system of internal control is functioning within
     the Corporation.

  3. Oversee that management has established and maintained processes to
     assure compliance by the Corporation with all applicable laws,
     regulations and corporate policy.

  The Audit Committee will primarily fulfill these responsibilities by
carrying out the activities enumerated in Section IV of this Charter.

  The Corporation's management is responsible for preparing the Corporation's
financial statements. The Corporation's independent auditors are responsible
for auditing the financial statements. The activities of the Committee are in
no way designed to supersede or alter those traditional responsibilities.
Except to the extent required by the Nasdaq Policy (defined below), membership
on the Committee does not call for the professional training or technical
skills generally associated with career professionals in the fields of
accounting and auditing. In addition, the Corporation's independent auditors
and the internal audit staff have more available time and information than
does the Committee. Accordingly, the Committee's role does not provide any
special assurances with regard to the Corporation's financial statements, nor
does it involve a professional evaluation of the quality of the audits
performed by the independent auditors.

COMPOSITION

  The Audit Committee shall be comprised of three or more independent
directors elected by the Board of Directors for a one-year term, all of whom
(except as otherwise permitted) shall meet the requirements of NASD
Marketplace Rule 4310(c)(26) (the "Nasdaq Policy"). The Chairman, if any, of
the Audit Committee shall be appointed by the Board of Directors.

  In addition to the other requirements of the Nasdaq Policy, all members of
the Audit Committee shall have a working familiarity with basic finance and
accounting practices, and at least one member of the Audit Committee shall
have accounting or related financial management expertise.

                                      A-1


MEETINGS

  The Audit Committee shall meet on a regular basis and shall hold special
meetings as required to discharge the functions specified in this Charter. A
majority of the Audit Committee will constitute a quorum for the conduct of
business.

  Minutes will be kept of each meeting of the Audit Committee and will be
provided to each member of the board. Any action of the Audit Committee shall
be subject to revision, modification, rescission or alteration by the Board of
Directors, provided that no neglect of third parties shall be affected by any
such revision, modification, rescission or alteration.

RESPONSIBILITIES AND DUTIES

  To fulfill its responsibilities and duties the Audit Committee shall:

   1.   Review this Charter at least annually to ensure compliance with the
        Nasdaq Policy and, if required, recommend changes to the Board of
        Directors.

   2.   Review the Corporation's significant accounting principles, policies
        and practices.

   3.   Review the Corporation's annual financial statements and any other
        relevant reports or other financial information.

   4.   Review the regular internal financial reports prepared by management
        and any internal auditing department.

   5.   Recommend to the Board of Directors the selection of the independent
        auditors and approve the fees and other compensation to be paid to
        the independent auditors. On an annual basis, the Committee shall
        obtain a formal written statement from the independent auditors
        delineating all relationships between the accountants and the
        Corporation consistent with Independence Standards Board Standard 1,
        and shall review and discuss with the accountants all significant
        relationships the accountants have with the Corporation to determine
        the accountants' independence and consider the compatibility of non-
        audit services with the auditors' independence.

   6.   Review the intended scope of the annual audit and the audit methods
        and principles being applied by the independent auditors.

   7.   In conjunction with the independent auditors, review the integrity of
        the Corporation's financial reporting processes.

   8.   Review the performance of the independent auditors and approve any
        proposed discharge of the independent auditors when circumstances
        warrant.

   9.   Following completion of the annual audit, review separately with the
        independent auditors, the internal auditing department, if any, and
        management any significant difficulties encountered during the course
        of the audit.

  10.   Review with financial management and the independent auditors the
        Corporation's quarterly financial results prior to the release of
        earnings and/or the Corporation's quarterly financial statements
        prior to filing or distribution. Discuss any significant changes to
        the Corporation's accounting principles and any items required to be
        communicated by the independent auditors in accordance with SAS 61
        (see item 11.) The Chair of the Committee may represent the entire
        Audit Committee for purposes of this review.

  11.   Discuss certain matters required to be communicated to the audit
        committees in accordance with AICPA Auditing Standards (SAS) No. 61,
        including:

    (a)   The auditors' responsibility under Generally Accepted Auditing
          Standards;

    (b)   Significant accounting policies;

                                      A-2


    (c)   Management judgments and accounting estimates;

    (d)   Significant audit adjustments;

    (e)   Other information in documents containing audited financial
          statements;

    (f)   Disagreements with management including accounting principles,
          scope of audit and disclosures;

    (g)   Consultation with other accountants by management, and

    (h)   Difficulties encountered in performing the audit.

  12.   On at least an annual basis, review with the Corporation's counsel,
        any legal matters that could have a significant impact on the
        organization's financial statements, the Corporation's compliance
        with applicable laws and regulations and inquiries received from
        regulators or governmental agencies.

  13.   Perform any other activities consistent with this Charter, the
        Corporation's By-laws and governing law, as the Audit Committee or
        the Board of Directors deems necessary or appropriate.

                                      A-3


[FRONT OF CARD]

                              ACTIVE POWER, INC.

                                     PROXY

THIS PROXY IS SOLICITED ON BEHALF OF THE BOARD OF DIRECTORS OF ACTIVE
POWER, INC.

  The undersigned revokes all previous proxies, acknowledges receipt of the
Notice of the Annual Meeting of Stockholders (the "Annual Meeting") of Active
Power, Inc., a Delaware corporation ("Active Power"), and the related Proxy
Statement dated March 15, 2001, and appoints David S. Gino and Michael Chibib,
and each of them, the Proxy of the undersigned, with full power of substitution,
to vote all shares of Common Stock of Active Power which the undersigned is
entitled to vote, either on his or her own behalf or on behalf of any entity or
entities, at the Annual Meeting to be held April 26, 2001 at Renaissance Austin
Hotel, 9721 Arboretum Boulevard, Austin, Texas 78759, at 3:00 p.m. Central
Daylight Time, and at any adjournment or postponement thereof, with the same
force and effect as the undersigned might or could do if personally present at
the Annual Meeting. The shares represented by this Proxy shall be voted in the
manner set forth hereon.

1. TO ELECT THE FOLLOWING TWO(2) NOMINEES AS DIRECTORS:

   Class I Directors to serve for a three-year term ending at the 2004 annual
   meeting of stockholders or until their successors are duly elected and
   qualified:

                                                   Richard E. Anderson
                                                     Rodney S. Bond

   [_] FOR ALL nominees                            [_] WITHHOLD AUTHORITY to
                                                       vote for ALL nominees

   [_] FOR all nominees listed EXCEPTED those listed below.

   INSTRUCTION: To withhold authority to vote for any individual nominee, write
   that nominee's name on the space provided below.

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

                                     (continued and to be signed on the reverse)


[REVERSE OF CARD]

(continued from front)

2.  [_] FOR   [_] AGAINST  [_] ABSTAIN   TO RATIFY THE APPOINTMENT OF ERNST &
                                         YOUNG LLP AS INDEPENDENT AUDITORS FOR
                                         ACTIVE POWER FOR THE FISCAL YEAR
                                         ENDING DECEMBER 31, 2001.

3.  In accordance with the discretion of the proxy holders, to act upon all
    matters incident to the conduct of the meeting and upon other matters as
    may properly come before the Annual Meeting.

    The Board of Directors recommends a vote FOR both of the directors listed
above and a vote FOR the listed proposal. This Proxy, when properly executed,
will be voted as specified hereon. IF NO SPECIFICATION IS MADE, THIS PROXY WILL
BE VOTED "FOR" THE ELECTION OF BOTH OF THE DIRECTORS LISTED ABOVE AND "FOR" THE
LISTED PROPOSAL.

    Please print the name(s) appearing
    on each share certificate(s) over
    which you have voting authority:____________________________________________
                                        (Print name(s) exactly as it (they)
                                             appear(s) on certificates)


    Please sign your name:___________________________  Date:_____________, 2001
                           (Authorized Signature(s))

    IMPORTANT: PLEASE SIGN AS YOUR NAME APPEARS HEREON. IF SHARES ARE HELD
               JOINTLY, ALL HOLDERS MUST SIGN. WHEN SIGNING AS ATTORNEY,
               EXECUTOR, ADMINISTRATOR, TRUSTEE OR GUARDIAN, PLEASE GIVE YOUR
               FULL TITLE. IF A CORPORATION, PLEASE SIGN IN FULL CORPORATE
               NAME BY PRESIDENT OR OTHER AUTHORIZED OFFICER. IF A PARTNERSHIP,
               PLEASE SIGN IN PARTNERSHIP NAME BY AUTHORIZED PERSON.