Exhibit 31.2

Certification of Chief Financial Officer
Pursuant to Section 302 of the Sarbanes-Oxley Act and Rule 13a-14(a)
or 15d-14(a) under the Securities Exchange Act of 1934

I, Joseph P. O'Leary, certify that:

1. I have reviewed this Annual Report on Form 10-K of WPS Resources
Corporation;

2. Based on my knowledge, this annual 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 annual
report;

3. Based on my knowledge, the financial statements, and other financial
information included in this annual 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 annual 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 annual 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 annual report our conclusions about the
>   effectiveness of the disclosure controls and procedures, as of the end of the
>   period covered by this annual report based on such evaluation; and
>   d) Disclosed in this annual 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 the registrant's board of
directors (or persons performing the equivalent functions):

> 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: March 9, 2005 | /s/ Joseph P. O'Leary                                                    
|------------------- | -------------------------------------------------------------------------
|                    | Joseph P. O'Leary
      Senior Vice President and Chief Financial Officer