Exhibit 5

                         LeBoeuf, Lamb, Greene & MacRae
                                     L.L.P.
                              125 West 55th Street
                             New York, NY 10019-5389


                                          October 22, 1996


Public Service Company of Colorado
1225 17th Street
Denver, Colorado  80202

      Re:  Public Service Company of Colorado --
            $400,000,000 in Aggregate Principal Amount of
            First Collateral Trust Bonds
            ---------------------------------------------
Dear Sirs:

            We are acting as counsel for Public Service Company of Colorado (the
"Company")  in  connection  with  the  proposed  issuance  and  sale  of  up  to
$400,000,000 in aggregate  principal amount of First Collateral Trust Bonds (the
"Securities")  of the  Company,  to be  issued in one or more  separate  series,
pursuant  to an  Indenture  dated as of  October  1,  1993,  and the  indentures
supplemental  thereto,  including  one or  more  supplemental  indentures  to be
entered  into  in  connection   with  the  issuance  of  the   Securities   (the
"Indenture"),  between  the  Company  and  First  Trust  of New  York,  National
Association, as successor trustee thereunder (the "Trustee").

            As  such  counsel,   we  have  examined  such   corporate   records,
certificates  and  other  documents  as we  have  considered  necessary  for the
purposes of this opinion.  In such examination,  we have assumed the genuineness
of  all  signatures,  the  authenticity  of  all  documents  submitted  to us as
originals,  the conformity to the original documents of all documents  submitted
to us as copies and the authenticity of the originals of such latter  documents.
As to any facts material to our opinion,  we have,  when relevant facts were not
independently established,  relied upon the aforesaid records,  certificates and
documents.

            Upon the  basis of the  foregoing  examination  and  subject  to the
limitations contained herein, we are of the opinion that:





Public Service Company of Colorado
October 22, 1996
Page 2


                  (a) when (i) the  Registration  Statement  that is being filed
      with the Securities and Exchange Commission with respect to the Securities
      has become  effective  under the  Securities  Act of 1933, as amended (the
      "Act") and (ii) the  Prospectus  relating to the  Securities has been duly
      supplemented with respect to the Securities of a particular  series,  and,
      as so  supplemented,  duly filed under the Act, no further  authorization,
      consent or approval by any  regulatory  authority will be required for the
      valid issuance and sale of the Securities of such series (except under the
      so-called  "blue-sky" or securities laws of the several states,  as to the
      applicability of which we do not express an opinion);

                  (b) when the Board of  Directors  of the Company has  approved
      the terms and conditions of the Supplemental  Indenture  creating a series
      of Securities  and the terms and  conditions  relating to the issuance and
      sale of the Securities of such series,  the Securities of such series will
      have been duly authorized by the Company;

                  (c) upon the  execution  and  filing  with the  Trustee of the
      proper papers with respect to the Securities of a particular  series,  the
      Securities  of such  series  will  be  issuable  under  the  terms  of the
      Indenture; and

                  (d) upon the  execution,  authentication  and  delivery of the
      Securities of each particular  series in accordance with the corporate and
      governmental  authorizations  and the  instruments  referred to above and,
      upon receipt of payment  therefor,  the  Securities of such series will be
      legally issued and binding obligations of the Company and will be entitled
      to the benefits  provided by the Indenture on a parity with the Securities
      of other series which may hereafter be issued  thereunder  pursuant to the
      terms thereof.

            We consent to the filing of this  opinion with and as a part of said
Registration  Statement  and  the use of our  name  therein  and in the  related
Prospectus  under  the  caption  "Legal  Opinions"  and  in  any  amendments  or
supplements to the Registration Statement and Prospectus.

                                Very truly yours,

                              /s/LeBoeuf, Lamb, Greene & MacRae, L.L.P