Exhibit 99.1  CERTIFICATION PURSUANT TO RULE 13a-14 OR
15d-14 OF THE
SECURITIES EXCHANGE ACT OF 1934, AS ADOPTED PURSUANT TO
SECTION 302 OF THE SARBANES-OXLEY ACT OF 2002  I,
Randall K. Eresman, certify that:  1.I have reviewed this annual report on Form 40-F
of EnCana Corporation;  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 issuer as of,
and for, the periods presented in this report;  4.The issuer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 issuer 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
issuer, 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 issuer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
issuers internal control over financial reporting that occurred during the
period covered by the annual report that has materially affected, or is
reasonably likely to materially affect, the issuers internal control over
financial reporting; and  5.The issuers other certifying officer and I
have disclosed, based on our most recent evaluation of internal control over
financial reporting, to the issuers


auditors
and the audit committee of the issuer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 issuer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
issuers internal control over financial reporting.   Dated: February 20, 2009  /s/
  Randall K. EresmanRandall
  K. EresmanPresident & Chief Executive Officer 
  (Principal Executive Officer)