MidAmerican Energy Holdings Company 666 Grand Avenue, Suite 500 Des Moines, Iowa 50309 September 17, 2008 Mr. Mayo A. Shattuck III Chairman, President and Chief Executive Officer Constellation Energy Group, Inc. 750 E. Pratt Street Baltimore, Maryland...Letter Agreement • September 19th, 2008 • Midamerican Energy Holdings Co /New/ • Electric, gas & sanitary services
