**EXHIBIT 31.1**

** Certification**

** **I, Jeffry E. Sterba, certifythat:

1.         I have reviewed this quarterlyreport on Form 10-Q of each of PNM Resources, Inc. and Public Service Companyof New Mexico;

2.         Based on my knowledge, thisreport does not contain any untrue statement of a material fact or omit tostate a material fact necessary to make the statements made, in light of thecircumstances under which such statements were made, not misleading withrespect to the period covered by this report;

3.        Based on my knowledge, thefinancial statements, and other financial information included in this report,fairly present in all material respects the financial condition, results ofoperations and cash flows of each registrant as of, and for, the periodspresented in this report;

4.         Each registrant's othercertifying officer and I are responsible for establishing and maintainingdisclosure controls and procedures (as defined in Exchange Act Rules 13a-15(e)and 15d-15(e)) and internal control over financial reporting (as defined inExchange Act Rules 13a-15(f) and 15d-15(f)) for such registrant and have:

a)           Designed such disclosure controls and procedures, or causedsuch disclosure controls and procedures to be designed under our supervision,to ensure that material information relating to such registrant, including itsconsolidated 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, orcaused such internal control over financial reporting to be designed under oursupervision to provide reasonable assurance regarding the reliability offinancial reporting and the preparation of financial statements for externalpurposes in accordance with generally accepted accounting principles;

c)           Evaluated the effectiveness of such registrant's disclosurecontrols and procedures and presented in this report our conclusions about theeffectiveness of the disclosure controls and procedures, as of the end of theperiod covered by this report based on such evaluation; and

----

d)           Disclosed in this report any change in each registrant'sinternal control over financial reporting that occurred during eachregistrant's most recent fiscal quarter (each registrant's fourth fiscalquarter in the case of an annual report) that has materially affected, or isreasonably likely to materially affect, such registrant's internal control overfinancial reporting; and

5.        Each registrant's othercertifying officer and I have disclosed, based on our most recent evaluation ofinternal control over financial reporting, to such registrant's auditors andthe audit committee of such registrant's board of directors (or personsperforming the equivalent functions):

a)           All significant deficiencies and material weaknesses in thedesign or operation of internal controls over financial reporting which arereasonably likely to adversely affect such registrant's ability to record,process, summarize and report financial information; and

b)           Any fraud, whether or not material, that involvesmanagement or other employees who have a significant role in such registrant'sinternal control over financial reporting.

 

Date:  August 8, 2005

 
| /s/ Jeffry E. Sterba |
|----------------------|

Jeffry E. Sterba,Chairman, President andChief Executive OfficerPNM Resources, Inc. and Public Service Company of New Mexico