Exhibit 11 ENRON CORP. AND SUBSIDIARIES CALCULATION OF EARNINGS PER SHARE (Unaudited) Three Months Ended Nine Months Ended September 30, September 30, 1997 1996 1997 1996 (in millions, except share and per share amounts) Primary Earnings Per Share Earnings on common stock Net income $ 134 $ 123 $ (64) $ 453 Preferred stock dividends (5) (4) (13) (12) $ 129 $ 119 $ (77) $ 441 Average number of common shares outstanding 294 247 264 246 Primary earnings per share of common stock $0.44 $0.48 $(0.29) $1.79 Fully Diluted Earnings Per Share Adjusted earnings on common stock Net income $ 134 $ 123 $ (64) $ 453 Preferred stock dividends (5) (4) (13) (12) Add back: Dividends on convertible preferred stock 5 4 13 12 $ 134 $ 123 $ (64) $ 453 Average number of common shares outstanding on a fully diluted basis Average number of common shares outstanding 294 247 264 246 Additional shares issuable upon: Conversion of preferred stock 18 19 18 19 Exercise of stock options reduced by the number of shares which could have been purchased with the proceeds from exercise of such options 5 5 5 5 317 271 287 270 Fully diluted earnings per share of common stock $0.42 $0.45 $(0.22)(a) $1.68 <FN> (a) This calculation is submitted in accordance with Regulation S-K item 601(b)(ii) although it is contrary to paragraph 40 of APB Opinion No. 15 because it produces an antidilutive result.