UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

FORM 8-K

Current Report

Pursuant to Section 13 or 15(d)

of the Securities Exchange Act of 1934

Date of Report (Date of earliest event reported):

March 6, 2017

(A Missouri Corporation)

1200 Main Street

Kansas City, Missouri 64105

(816) 556-2200

NOT APPLICABLE

(Former name or former address, if changed since last report)

Check the appropriate box below if the Form 8-K filing is intended to simultaneously satisfy the filing obligation of the registrant under any of the following provisions:

On March 9, 2017, Great Plains Energy Incorporated (“Great Plains Energy”) issued $750,000,000 aggregate principal amount of 2.50% Notes due 2020, $1,150,000,000 aggregate principal amount of 3.15% Notes due 2022, $1,400,000,000 aggregate principal amount of 3.90% Notes due 2027 and $1,000,000,000 aggregate principal amount of 4.85% Notes due 2047 (collectively, the “Notes”), pursuant to an Underwriting Agreement, dated March 6, 2017, between Great Plains Energy and Goldman, Sachs & Co., as representative of the several underwriters named therein. The Notes were registered under the Securities Act of 1933, as amended, pursuant to the Post-Effective Amendment No. 1 to the registration statement (the “Registration Statement”) on Form S-3 of Great Plains Energy, filed with the Securities and Exchange Commission on September 27, 2016 (File No. 333-202692).

In connection with the issuance and sale of the Notes, Great Plains Energy entered into the several agreements and other instruments listed in Item 9.01 of this Current Report on Form 8-K and filed as exhibits hereto. These exhibits are incorporated by reference into the Registration Statement.

(d) Exhibits.

SIGNATURES

Pursuant to the requirements of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned hereunto duly authorized.

EXHIBIT INDEX