Exhibit 31.2




CERTIFICATION PURSUANT TO SECTION 302 OF THE
SARBANES-OXLEY ACT OF 2002




I, Frederick W.
Jones, certify that:




1.
    
    I have reviewed this Quarterly Report on
      Form 10-Q of Mechanical Technology, Incorporated;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
      15(d)-15(e)) and internal control over financial reporting (as defined in
      Exchange Act Rules 13a-15(f) and 15(d)-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; andd)
    
    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; and5.
    
    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 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.






August 13, 2010
            /S/ FREDERICK W.
      JONESFrederick W. JonesActing Chief Financial Officer(Principal Financial Officer)






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