NEW YORK ( TheStreet) -- The ex-dividend date for Great Plains Energy (NYSE: GXP) is tomorrow, May 25, 2012. Owners of shares as of market close today will be eligible for a dividend of 21 cents per share. At a price of $19.78 as of 9:30 a.m. ET, the dividend yield is 4.3%. The average volume for Great Plains Energy has been 1.1 million shares per day over the past 30 days. Great Plains Energy has a market cap of $2.72 billion and is part of the utilities sector and utilities industry. Shares are down 8.3% year to date as of the close of trading on Wednesday. Great Plains Energy Incorporated, through its subsidiaries, engages in the generation, transmission, distribution, and sale of electricity in the United States. The company also provides steam services in the Missouri area. The company has a P/E ratio of 17.1, below the average utilities industry P/E ratio of 17.2 and below the S&P 500 P/E ratio of 17.7.