**Exhibit 31.02**

**CERTIFICATION**

I, Benjamin G.S. FowkeIII, certify that:

1. I have reviewedthis report on Form 10-K of Northern States Power Co. (a Minnesotacorporation);

2. Based on myknowledge, this report does not contain any untrue statement of a material factor omit to state a material fact necessary to make the statements made, inlight of the circumstances under which such statements were made, notmisleading with respect to the period covered by this report;

3. Based on myknowledge, the financial statements, and other financial information includedin this report, fairly present in all material respects the financialcondition, results of operations and cash flows of the registrant as of, andfor, the periods presented in this report;

4. The registrant’sother certifying officer and I are responsible for establishing and maintainingdisclosure controls and procedures (as defined in Exchange ActRules 13a-15(e) and 15d-15(e)) for the registrant and we have:

a)         designed such disclosurecontrols and procedures or caused such disclosure controls and procedures to bedesigned under our supervision, to ensure that material information relating tothe registrant, including its consolidated subsidiaries, is made known to us byothers within those entities, particularly during the period in which thisannual report is being prepared;

b)        evaluated theeffectiveness of the registrant’s disclosure controls and procedures andpresented in this report our conclusions about the effectiveness of thedisclosure controls and procedures, as of the end of the period covered by thisreport based on such evaluation; and

c)         disclosed in this reportany change in the registrant’s internal control over financial reporting thatoccurred during the registrant’s most recent fiscal quarter (the registrant’sfourth fiscal quarter in the case of an annual report) that has materiallyaffected or is reasonably likely to materially affect, the registrant’sinternal control over financial reporting;

5. The registrant’sother certifying officer and I have disclosed, based on our most recentevaluation of internal control over financial reporting, to the registrant’sauditors and the audit committee of the registrant’s board of directors (orpersons performing the equivalent function):

a)         all significantdeficiencies and material weaknesses in the design or operation of internalcontrol over financial reporting which are reasonably likely to adverselyaffect the registrant’s ability to record, process, summarize and reportfinancial data; and

b)        any fraud, whether or notmaterial, that involves management or other employees who have a significantrole in the registrant’s internal control over financial reporting.

 
|                               |   | /s/ BENJAMIN G.S. FOWKE III                |   |
|-------------------------------|--------|--------------------------------------------|--------|
|                          |   | Benjamin G.S. Fowke III                    |   |
|                          |   | Vice President and Chief Financial Officer |   |
|                          |   |                                       |   |
| Date:  February 26, 2007 |   |                                       |   |

 

 

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