POWER OF ATTORNEY

        Know all by these presents, that the undersigned hereby constitutes and
appoints Joseph G. Mahler, R. Daniel Brdar, Jacqueline Perez-Ares, Ross M.
Levine or Michael Bishop, or any of them signing singly, and with full power of
substitution, the undersigned's true and lawful attorneyinfact to:

(1)     prepare, execute in the undersigneds name and on the undersigneds
        behalf, and submit to the U.S. Securities and Exchange Commission
        (the SEC) a Form ID, including amendments thereto, and any other
        documents necessary or appropriate to obtain codes and passwords
        enabling the undersigned to make electronic filings with the SEC of
        reports required by Section 16(a) of the Securities Exchange Act of 1934
        or any rule or regulation of the SEC;

(2)     execute for and on behalf of the undersigned, in the undersigned's
        capacity as an officer and/or director of FuelCell Energy, Inc.
        (the Company), Forms3, 4, and 5 in accordance with Section16(a) of the
        Securities Exchange Act of 1934 and the rules thereunder;

(3)     do and perform any and all acts for and on behalf of the undersigned
        which may be necessary or desirable to complete and execute any such
        Form3, 4, or 5, complete and execute any amendment or amendments
        thereto, and timely file such form with the SEC and any stock exchange
        or similar authority; and

(4)     take any other action of any type whatsoever in connection with the
        foregoing which, in the opinion of such attorneyinfact, may be of
        benefit to, in the best interest of, or legally required by, the
        undersigned, it being understood that the documents executed by such
        attorneyinfact on behalf of the undersigned pursuant to this
        Power of Attorney shall be in such form and shall contain such terms and
        conditions as such attorneyinfact may approve in such attorneyinfact's
        discretion.

        The undersigned hereby grants to each such attorneyinfact full power and
authority to do and perform any and every act and thing whatsoever requisite,
necessary, or proper to be done in the exercise of any of the rights and powers
herein granted, as fully to all intents and purposes as the undersigned might or
could do if personally present, with full power of substitution or revocation,
hereby ratifying and confirming all that such attorneyinfact, or such
attorneyinfact's substitute or substitutes, shall lawfully do or cause to be
done by virtue of this power of attorney and the rights and powers herein
granted. The undersigned acknowledges that the foregoing attorneysinfact, in
serving in such capacity at the request of the undersigned, are not assuming,
nor is the Company assuming, any of the undersigned's responsibilities to comply
with Section16 of the Securities Exchange Act of 1934.

        This Power of Attorney shall remain in full force and effect until the
undersigned is no longer required to file Forms3, 4, and 5 with respect to the
undersigned's holdings of and transactions in securities issued by the Company,
unless earlier revoked by the undersigned in a signed writing delivered to the
foregoing attorneysinfact.

        IN WITNESS WHEREOF, the undersigned has caused this Power of Attorney to
be executed as of this 18th day of September 2007.


                /s/ Glenn Epstein
                Signature

                Glenn Epstein
                Print Name