EXHIBIT A
JOINT FILING AGREEMENT
Pursuant to Rule 13d-1(k)(1) promulgated under the Securities Exchange Act of
1934, the undersigned agree to the joint filing of a Statement on Schedule 13G
(including any and all amendments thereto, and any filing on Schedule 13D
relating to the same investment) with respect to the shares of common stock,
par value $0.001 per share, of Active Power, Inc., and further agree that this
Joint Filing Agreement be included as an Exhibit thereto. In addition, each
party to this Agreement expressly authorizes each other party to this
Agreement to file on its behalf any and all amendments to such Statement.
Dated: February 14, 2001.
RHO MANAGEMENT COMPANY, INC.
By: /s/ Xxxxxx Xxxx
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Name: Xxxxxx Xxxx
Title: President
XXXXXX XXXX
/s/ Xxxxxx Xxxx
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Name: Xxxxxx Xxxx
