Item 5.02. Departure of Directors or Certain Officers; Election of Directors;
Appointment of Certain Officers; Compensatory Arrangements of Certain Officers.

Effective on March 12, 2009, Robert Greenberg was appointed to the Board of Directors (the "Board") of Active Power, Inc., a Delaware corporation (the "Company"). Mr. Greenberg is not initially expected to serve on any committees of the Board. Mr. Greenberg will receive compensation from the Company for his service on the Board on the same terms as other non-employee members of the Board.

The press release issued by Active Power on March 17, 2009 announcing Mr. Greenberg's appointment to the Board is attached hereto as Exhibit 99.1 and is incorporated in this Item 5.02 by reference.

Item 9.01 Financial Statements and Exhibits.

(d) Exhibits

99.1 Press Release, dated March 17, 2009, regarding Robert Greenberg's appointment to the Board of Directors of Active Power, Inc.

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