MORRISON & HECKER L.L.P. ATTORNEYS AT LAW 2600 Grand Avenue Kansas City, Missouri 64108-4606 Telephone (816) 691-2600 Telefax (816) 474-4208 April 17, 1998 Kinder Morgan Energy Partners, L.P. 1301 McKinney Street, Suite 3450 Houston, Texas 77010 Re: Form S-3 Registration Statement Ladies and Gentlemen: We have acted as counsel to Kinder Morgan Energy Partners, L.P., a Delaware limited partnership (the "Partnership"), and Kinder Morgan G.P., Inc., a Delaware corporation and the general partner of the Partnership (the "KM General Partner"), in connection with the preparation of the Registration Statement on Form S-3, as amended, (Registration No. 333-25995) (the "Registration Statement") filed with the Securities and Exchange Commission pursuant to the Securities Act of 1933 (the "Act"). The Registration Statement covers Common Units ("Common Units") representing limited partner interests in the Partnership to be sold by First Union Investors, Inc., First Union Corporation ("First Union"), subsidiaries of First Union and/or Kinder Morgan G.P., Inc. In rendering the opinions set forth below, we have examined and relied on the following: (1) the Registration Statement and the attached Prospectus; (2) the Partnership's Second Amended and Restated Agreement of Limited Partnership dated January 14, 1998; and (3) such other documents, materials, and authorities as we have deemed necessary in order to enable us to render our opinions set forth below. In addition, our opinions are based on the facts and circumstances set forth in the Prospectus and on certain representations made by the Partnership, the KM General Partner and the Selling Unitholders. We have not made an independent investigation of such facts. Our opinion as to the matters set forth herein could change as a result of changes in facts and circumstances, changes in the terms of the documents reviewed by us, or changes in the law subsequent to the date hereof. Our opinion is based on the provisions of the Internal Revenue Code of 1986, as amended (the "Code"), regulations under such Code, judicial authority and current administrative rulings and practice, all as of the date of this letter, and all of which may change at any time. Kinder Morgan Energy Partners, L.P. April 17, 1998 Page 2 Based upon and subject to the foregoing and assuming compliance with all provisions of the documents referenced above, we are of the opinion that for federal income tax purposes (i) the Partnership and its operating partnerships are and will continue to be classified as partnerships and not as associations taxable as corporations; and (ii) each purchaser of Common Units who acquires beneficial ownership of the Partnership's Common Units, and either has been admitted or is pending admission to the Partnership as an additional limited partner, or if the Common Units are held by a nominee, such purchaser of Common Units will be treated as a partner of the Partnership for federal income tax purposes. Further, we are of the opinion that the discussion of federal income tax consequences set forth in the Prospectus under the heading "Material Federal Income Tax Considerations" is accurate in all material respects as to matters of law and legal conclusions. This opinion may be relied upon by you, the purchasers of Common Units and the Partnership. We hereby consent to the filing of this opinion as an Exhibit to the Registration Statement and to all references to this firm under the headings "Material Federal Income Tax Considerations" and "Legal Matters" in the Prospectus forming part of the Registration Statement. This consent is not to be construed as an admission that we are a person whose consent is required to be filed with the Registration Statement under the provisions of the Act. Very truly yours, /s/ MORRISON & HECKER L.L.P.