Exhibit 31.1
 CERTIFICATION
  1.
    
    I have reviewed this quarterly report on Form 10-Q of FuelCell Energy, Inc.;2.
    
    Based on my knowledge, this report does not contain any untrue statement of a material fact or
omit to state a material fact necessary to make the statements made, in light of the
circumstances under which such statements were made, not misleading with respect to the period
covered by this report;3.
    
    Based on my knowledge, the financial statements, and other financial information included in
this report, fairly present in all material respects the financial condition, results of
operations and cash flows of the registrant as of, and for, the periods presented in this
report;4.
    
    The registrants other certifying officer and I are responsible for establishing and
maintaining disclosure controls and procedures (as defined in Exchange Act Rules 13a-15(e) and
15d-15(e)) and internal control over financial reporting (as defined in Exchange Act Rules
13a-15(f) and 15d-15(f)) for the registrant and have:
 (a)
    
    Designed such disclosure controls and
procedures, or caused such disclosure
controls and procedures to be designed under
our supervision, to ensure that material
information relating to the registrant,
including its consolidated subsidiaries, is
made known to us by others within those
entities, particularly during the period in
which this report is being prepared;(b)
    
    Designed such internal control over
financial reporting, or caused such internal
control over financial reporting to be
designed under our supervision, to provide
reasonable assurance regarding the
reliability of financial reporting and the
preparation of financial statements for
external purposes in accordance with
generally accepted accounting principles;(c)
    
    Evaluated the effectiveness of the
registrants disclosure controls and
procedures and presented in this report our
conclusions about the effectiveness of the
disclosure controls and procedures, as of
the end of the period covered by this report
based on such evaluation, and(d)
    
    Disclosed in this report any change in the
registrants internal control over financial
reporting that occurred during the
registrants most recent fiscal quarter (the
registrants fourth fiscal quarter in the
case of an annual report) that has
materially affected, or is reasonably likely
to materially affect, the registrants
internal control over financial reporting;
and
 5.
    
    The registrants other certifying officer and I have disclosed, based on our most recent
evaluation of internal control over financial reporting, to the registrants auditors and the
audit committee of registrants board of directors (or persons performing the equivalent
function):
 (a)
    
    All significant
deficiencies and
material weaknesses
in the design or
operation of
internal control
over financial
reporting which are
reasonably likely
to adversely affect
the registrants
ability to record,
process, summarize
and report
financial
information; and(b)
    
    Any fraud, whether
or not material,
that involves
management or other
employees who have
a significant role
in the registrants
internal control
over financial
reporting.
 Date:   June 9, 2011
    /s/ Arthur A. BottoneArthur A. BottonePresident and Chief Executive Officer
(Principal Executive Officer)