Investor and Media Advisory: Great Plains Energy Second Quarter 2008 Earnings Webcast and Conference Call

Great Plains Energy Incorporated (NYSE:GXP): What:     Great Plains Energy Incorporated (NYSE:GXP) webcast and conference call to discuss the Company's results for second quarter 2008   Who: Michael J. Chesser, Chairman and CEO - Great Plains Energy William H. Downey, President and COO - Great Plains Energy and President and CEO - Kansas City Power & Light Terry Bassham, EVP Finance & Strategic Development and CFO - Great Plains Energy When: Thursday, August 7, 2008, 8:00 a.m. CDT / 9:00 a.m. EDT How To View: 1. Go to the Company’s website: www.greatplainsenergy.com; 2. Click on the webcast link on the home page; 3. If you have not previously accessed a Great Plains Energy webcast, provide the requested information on the registration page. How To Listen: 1. Fifteen minutes prior to the call, domestic callers may dial toll-free (800) 240-4186; international callers may dial (303) 262-2143 2. When asked, please reference access code 11116484. A replay of the webcast will be available for 90 days following the conference call at the same website www.greatplainsenergy.com. Earnings Press Release: The earnings press release will be issued after market close on Wednesday, August 6, 2008 Great Plains Energy Incorporated (NYSE:GXP) headquartered in Kansas City, MO, is the holding company for Kansas City Power & Light Company, a leading regulated provider of electricity in the Midwest. The Company’s web site is www.greatplainsenergy.com.