EXHIBIT 11 YANKEE ENERGY SYSTEM, INC. AND SUBSIDIARIES Earnings Per Share Computation For the Years Ended September 30 -------------------------------- 1997 1996 1995 ---- ---- ---- (Thousands of Dollars, Except Share Data) Net Income $16,957 $21,919 $12,358 ------- ------- ------- Average Common Shares Outstanding 10,451,165 10,435,196 10,332,447 ---------- ---------- ---------- Earnings Per Share $1.62(b) $2.10(b) $1.20(b) -------- -------- ----------- (a) Exclusive of an $0.08 per share charge resulting from an early redemption premium on the Company's preferred stock. (b) Earnings per share information is the same on both a primary and fully diluted basis as Yankee Energy System, Inc. has a simple capital structure.