In connection with the acquisition of Aquila, Inc., by Great Plains Energy, Great Plains Energy intends to file with
the SEC a registration statement on Form S-4, containing a joint proxy statement/prospectus and other relevant
materials. The final joint proxy statement/prospectus will be mailed to the stockholders of Great Plains Energy
and Aquila, Inc.. INVESTORS AND SECURITY HOLDERS OF GREAT PLAINS ENERGY AND AQUILA, INC.,
ARE URGED TO READ THE JOINT PROXY STATEMENT/PROSPECTUS AND THE OTHER RELEVANT
MATERIALS WHEN THEY BECOME AVAILABLE BECAUSE THEY WILL CONTAIN IMPORTANT
INFORMATION ABOUT GREAT PLAINS ENERGY, AQUILA, INC., AND THE ACQUISITION. The registration
statement and joint proxy statement/prospectus and other relevant materials (when they become available), and
any other documents filed by Great Plains Energy or Aquila, Inc., with the SEC, may be obtained free of charge at
the SEC’s web site at www.sec.gov. In addition, investors and security holders may obtain free copies of the
documents (when they are available) filed with the SEC by Great Plains Energy by directing a request to: Great
Plains Energy, 1201 Walnut, Kansas City, MO 64106, Attn: Investor Relations. Investors and security holders may
obtain free copies of the documents filed with the SEC by Aquila, Inc., by contacting Aquila, Inc., 20 West Ninth
Street, Kansas City, MO 64105, Attn: Investor Relations.
Great Plains Energy, Aquila, Inc., and their respective executive officers and directors may be deemed to be
participants in the solicitation of proxies relating to the proposed transaction. Information about the executive
officers and directors of Great Plains Energy and their ownership of Great Plains Energy common stock is set
forth in Great Plains Energy’s Annual Report on Form 10-K for the year ended December 31, 2005, which was
filed with the SEC on March 8, 2006, and the proxy statement for Great Plains Energy’s 2006 Annual Meeting of
Stockholders, which was filed with the SEC on March 20, 2006. Information regarding Aquila, Inc., directors and
executive officers and their ownership of Aquila, Inc., common stock is set forth in Aquila’s Annual Report on
Form 10-K for the year ended December 31, 2005, which was filed with the SEC on March 7, 2006 and the proxy
statement for Aquila’s 2006 Annual Meeting of Stockholders, which was filed with the SEC on March 24, 2006.
Investors and security holders may obtain more detailed information regarding the direct and indirect interests of
Great Plains Energy, Aquila, Inc., and their respective executive officers and directors in the proposed transaction
by reading the joint proxy statement/prospectus regarding the proposed transaction when it becomes available.