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Exhibit 24 NORTHWEST PIPELINE CORPORATION POWER OF ATTORNEY KNOW ALL MEN BY THESE PRESENTS that each of the undersigned individuals, in their capacity as
a director or officer, or both, as hereinafter set forth below their signature, of NORTHWEST
PIPELINE CORPORATION, a Delaware corporation (NWP), does hereby constitute and appoint RICHARD D.
RODEKOHR AND JEFFREY P. HEINRICHS their true and lawful attorneys and each of them (with full power
to act without the other) their true and lawful attorneys for them and in their name and in their
capacity as a director or officer, or both, of NWP, as hereinafter set forth below their signature,
to sign NWPs Annual Report to the Securities and Exchange Commission on Form 10-K for the fiscal
year ended December 31, 2004, and any and all amendments thereto or all instruments necessary or
incidental in connection therewith; and THAT the undersigned NWP does hereby constitute and appoint RICHARD D. RODEKOHR AND JEFFREY P.
HEINRICHS its true and lawful attorneys and each of them (with full power to act without the other)
its true and lawful attorney for it and in its name and on its behalf to sign said Form 10-K and
any and all amendments thereto and any and all instruments necessary or incidental in connection
therewith. Each of said attorneys shall have full power of substitution and resubstitution, and said
attorneys or any of them or any substitute appointed by any of them hereunder shall have full power
and authority to do and perform in the name and on behalf of each of the undersigned, in any and
all capacities, every act whatsoever requisite or necessary to be done in the premises, as fully to
all intents and purposes as each of the undersigned might or could do in person, the undersigned
hereby ratifying and approving the acts of said attorneys or any of them or of any such substitute
pursuant hereto. IN WITNESS WHEREOF, the undersigned have executed this instrument, all as of the
7th day of March, 2005. /s/ Phillip D. Wright
    
    
    
    /s/ Richard D. RodekohrPhillip D. Wright
Senior Vice President, Chief Executive
Officer, and Director
(Principal Executive Officer)
    
    
    
    Richard D. Rodekohr
Vice President and
Treasurer
(Principal Financial Officer)
 /s/ Jeffrey P. HeinrichsJeffrey P. Heinrichs
Controller
(Principal Accounting Officer)




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/s/ Steven J. Malcolm
    
    
    
    /s/Allison G. BridgesSteven J. Malcolm
Director
    
    
    
    Allison G. Bridges
Director
 NORTHWEST PIPELINE CORPORATION By
    
    /s Richard D. RodekohrRichard D. RodekohrVice President andTreasurer
 ATTEST: s/s Brian K. ShoreBrian K. ShoreSecretary




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NORTHWEST PIPELINE CORPORATION I, the undersigned, Brian K. Shore, Secretary of NORTHWEST PIPELINE CORPORATION, a Delaware
company (hereinafter called the Company), do hereby certify that pursuant to Section 141(f) of
the General Corporation Law of Delaware, the Board of Directors of this Corporation unanimously
consented, as of March 7, 2005, to the following: RESOLVED that the Chairman of the Board, the Senior Vice President or
any Vice President of the Company be, and each of them hereby is,
authorized and empowered to execute a Power of Attorney for use in
connection with the execution and filing, for and on behalf of the
Company, under the Securities Exchange Act of 1934, of the Companys
Annual Report on Form 10-K for the fiscal year ended December 31, 2004. I further certify that the foregoing resolution has not been modified, revoked or
rescinded and is in full force and effect. IN WITNESS WHEREOF, I have hereunto set my hand and affixed the corporate seal of NORTHWEST
PIPELINE CORPORATION this 7th day of March, 2005. s/s Brian K. ShoreBrian K. ShoreSecretary
 [CORPORATE SEAL]