2010: A YEAR OF TRANSITION AND ACHIEVEMENT CORPORATE PROFILE Chesapeake Energy Corporation is the second-largest producer of natural gas, a Top 15 producer of oil and natural gas liquids and the most active driller of new wells in the U.S. Headquartered in Oklahoma City, the company’s operations are focused on discovering and developing unconventional natural gas and oil fields onshore in the U.S. Chesapeake owns leading positions in the Barnett, Haynesville, Bossier, Marcellus and Pearsall natural gas shale plays and in the Granite Wash, Cleveland, Tonkawa, Mississippian, Bone Spring, Avalon, Wolfcamp, Wolfberry, Eagle Ford, Niobrara and Utica unconventional liquids-rich plays. The company has also vertically integrated its oper- ations and owns substantial midstream, compression, drilling and oilfield service assets. Chesapeake’s stock is listed on the New York Stock Exchange under the symbol CHK. Further information is available at www.chk.com where Chesapeake routinely posts announcements, updates, events, investor informa- tion, presentations and press releases. CONTENTS ON THE COVER 1 Financial Review 28 Board of Directors Moving west, a Chesapeake rig drills toward the Niobrara Shale 4 Letter to Shareholders 28 Governance in the Powder River Basin of 16 Operating Areas 29 Officers southeastern Wyoming, one of 20 Investor Q&A 30 Employees several new liquids-rich plays 22 Social Responsibility 45 Form 10-K that are enabling the company 24 Community Relations Inside Back Cover to increase its profitability and 26 Environmental, Health & Safety Corporate Information return on capital. 2010 ANNUAL REPORT | 3 Production Growth Proved Reserve Growth Total Resource Base Growth* Average mmcfe per day for year Bcfe at end of year Bcfe at end of year 3,000 3,000 3,000 20,000 20,000 20,000 300,000 120,000 120,000 2,500 2,500 2,500 250,000 100,000 100,000 15,000 15,000 15,000 2,000 2,000 2,000 200,000 80,000 80,000 1,500 1,500 1,500 10,000 10,000 10,000 150,000 60,000 60,000 1,000 1,000 1,000 100,000 40,000 40,000 5,000 5,000 5,000 500 500 500 50,000 20,000 20,000 0 0 0 0 0 0 0 0 0 00 01 02 0003 0104 020500 030601 040702 050803 060904 070510 08060907 1008 09 10 00 01 02 0003 0104 020500030601 040702 050803 060904 070510 08060907 1008 09 10 00 01 02 0003 0104 020500030601 040702 050803 060904 071005 08060907 1008 09 10 *Proved and unrisked, unproved reserves Chesapeake’s Stock Price Chesapeake’s Stock Price at Month End Henry Hub Natural Gas Spot Price at Month End $ 70 $ 17.50 3000 3000 3000 20000 20000 20000 300000 120000 120000 $ 60 $ 15.00 2500 2500 2500 250000 100000 100000 $ 50 $ 12.50 15000 15000 15000 2000 2000 $2000 40 200000 80000 80000 $ 10.00 $/mcf 1500 1500 $1500 30 10000 10000 10000 150000 60000 60000 $ 7.50 CHK Stock Price CHK Stock $ 20 $ 5.00 1000 1000 1000 100000 40000 40000 5000 5000 5000 $ 10 $ 2.50 500 500 500 50000 20000 20000 $ 0 $ 0 DEC 00 DEC 01 DEC 02 DEC 03 DEC 04 DEC 05 DEC 06 DEC 07 DEC 08 DEC 09 DEC 10 0 0 0 0 0 0 0 0 0 Chesapeake’s Five-Year and Ten-Year Common Stock Performance The graphs below compare the performance of our common stock to the S&P 500 Stock Index and a group of peer companies for the past five and 10 years. The graph on the left assumes an investment of $100 on December 31, 2004 and the reinvestment of all dividends. The graph on the right assumes an invest - 80ment of $100 on December 31, 1999 and the reinvestment of all dividends. The graphs show the value of the investment at the end of each year. 20 70FIVE-YEAR PERFORMANCE TEN-YEAR PERFORMANCE As of December 31 As of December 31 60 CHK 2010 Peer Group (1) S&P 500 CHK 2010 Peer Group (1) S&P 500 15 50$ 150 $ 500 40$ 120 $ 400 10 30 20$ 90 $ 300 5 10 $ 60 $ 200 0 0 $ 30 $ 100 $ 0 $ 0 05 06 07 08 09 10 00 01 02 03 04 05 06 07 08 09 10 (1) The 2010 peer group is comprised of Anadarko Petroleum Corp., Apache Corp., Devon Energy Corp., Encana Corp. and EOG Resources, Inc. 150 XTO Energy, Inc. was not included in the 2010 peer group due to its acquisition by Exxon Mobil Corp. 500150 500 120 400120 400 90 300 90 300 60 200 60 200 30 100 30 100 0 0 0 0 150 500150 500 120 400120 400 90 300 90 300 60 200 60 200 30 100 30 100 0 0 0 0 150 500150 500 1 | FINANCIAL REVIEW FINANCIAL REVIEW » ($ in millions, except per share data) Years Ended December 31 Financial and Operating Data 2010 2009 2008 2007 2006 2005 2004 2003 2002 2001 2000 1999 1998 1997 1997 1996 1995 1994 1993 Revenues Natural gas and oil sales $ 5,647 $ 5,049 $ 7,858 $ 5,624 $ 5,619 $ 3,273 $ 1,936 $ 1,297 $ 568 $ 820 $ 470 $ 280 $ 257 $ 96 $ 193 $ 111 $ 57 $ 22 $ 12 Marketing, gathering, compression and service operations sales 3,719 2,653 3,771 2,176 1,707 1,392 773 420 171 149 158 75 121 58 76 35 9 7 5 Total revenues 9,366 7,702 11,629 7,800 7,326 4,665 2,709 1,717 739 969 628 355 378 154 269 146 66 29 17 Operating costs Production expenses 893 876 889 640 490 317 205 138 98 75 50 46 51 8 11 6 3 2 3 Production taxes 157 107 284 216 176 208 104 78 30 33 25 13 8 2 4 2 1 2 — General and administrative expenses 453 349 377 243 139 64 37 24 18 15 13 13 20 6 9 5 4 3 3 Marketing, gathering, compression and service operations expenses 3,560 2,498 3,648 2,063 1,590 1,358 755 410 166 144 152 72 119 58 75 33 8 5 4 Depreciation, depletion and amortization 1,614 1,615 2,144 1,988 1,462 945 611 386 235 182 109 103 155 63 107 54 27 10 5 Impairments and other (116 ) 11,202 2,830 — 55 — 5 6 — — — — 881 110 236 — — — 1 Total operating costs 6,561 16,647 10,172 5,150 3,912 2,892 1,717 1,042 547 449 349 247 1,234 247 442 100 43 22 16 Income (loss) from operations 2,805 (8,945 ) 1,457 2,650 3,414 1,773 992 675 192 520 279 108 (856 ) (93 ) (173 ) 46 23 7 1 Interest expense (19 ) (113) (271 ) (401 ) (316 ) (221 ) (167 ) (154 ) (112 ) (98 ) (86 ) (81 ) (68 ) (18 ) (18) (14 ) (7 ) (3 ) (2 ) Other income (expense) 243 (28 ) (11 ) 15 26 10 5 1 7 3 3 8 4 79 11 4 2 1 1 Miscellaneous gains (losses) (145 ) (202) (184 ) 83 117 (70 ) (25 ) (21 ) (20 ) (63 ) — — (14 ) — (7 ) — — — — Total other income (expense) 79 (343 ) (466 ) (303 ) (173 ) (281 ) (187 ) (174 ) (125 ) (158 ) (83 ) (73 ) (78 ) 61 (14 ) (10 ) (5 ) (2 ) (1 ) Income (loss) before income taxes and cumulative effect of accounting change 2,884 (9,288 ) 991 2,347 3,241 1,492 805 501 67 362 196 35 (934 ) (32 ) (187 ) 36 18 5 — Income tax expense (benefit): Current — 4 423 29 5 — — 5 (2) 4 — — — — — — — — — Deferred 1,110 (3,487 ) (36 ) 863 1,242 545 290 185 29 141 (260 ) 2 — — (4 ) 13 6 1 — Net income (loss) before cumulative effect of accounting change, net of tax 1,774 (5,805 ) 604 1,455 1,994 947 515 311 40 217 456 33 (934 ) (32 ) (183 ) 23 12 4 — Net (income) loss attributable to noncontrolling interest — (25 ) — — — — — — — — — — — — — — — — — Cumulative effect of accounting change, net of tax — — — — — — — 2 — — — — — — — — — — — Net income (loss) 1,774 (5,830 ) 604 1,455 1,994 947 515 313 40 217 456 33 (934 ) (32 ) (183 ) 23 12 4 — Preferred stock dividends (111 ) (23 ) (33 ) (94 ) (89 ) (42 ) (40 ) (22 ) (10 ) (2 ) (9 ) (16 ) (12 ) — — — — — (1 ) Gain (loss) on conversion/exchange of preferred stock — — (67 ) (128 ) (10 ) (26 ) (36 ) — — — 7 — — — — — — — — Net income (loss) available to common shareholders $ 1,663 $ (5,853 ) $ 504 $ 1,233 $ 1,895 $ 879 $ 439 $ 291 $ 30 $ 215 $ 454 $ 17 $ (946 ) $ (32 ) $ (183 ) $ 23 $ 12 $ 4 $ (1 ) Earnings per common share – basic: Income (loss) before cumulative effect of accounting change $ 2.63 $ (9.57 ) $ 0.94 $ 2.70 $ 4.76 $ 2.73 $ 1.73 $ 1.36 $ 0.18 $ 1.33 $ 3.52 $ 0.17 $ (9.97 ) $ (0.45 ) $ (2.79 ) $ 0.43 $ 0.22 $ 0.08 $ (0.02 ) Cumulative effect of accounting change — — — — — — — 0.02 — — — — — — — — — — — EPS – basic $ 2.63 $ (9.57 ) $ 0.94 $ 2.70 $ 4.76 $ 2.73 $ 1.73 $ 1.38 $ 0.18 $ 1.33 $ 3.52 $ 0.17 $ (9.97 ) $ (0.45 ) $ (2.79 ) $ 0.43 $ 0.22 $ 0.08 $ (0.02 ) Earnings per common share – diluted: Income (loss) before cumulative effect of accounting change $ 2.51 $ (9.57 ) $ 0.93 $ 2.63 $ 4.33 $ 2.51 $ 1.53 $ 1.20 $ 0.17 $ 1.25 $ 3.01 $ 0.16 $ (9.97 ) $ (0.45 ) $ (2.79 ) $ 0.40 $ 0.21 $ 0.08 $ (0.02 ) Cumulative effect of accounting change — — — — — — — 0.01 — — — — — — — — — — — EPS – diluted $ 2.51 $ (9.57 ) $ 0.93 $ 2.63 $ 4.33 $ 2.51 $ 1.53 $ 1.21 $ 0.17 $ 1.25 $ 3.01 $ 0.16 $ (9.97 ) $ (0.45 ) $ (2.79 ) $ 0.40 $ 0.21 $ 0.08 $ (0.02 ) Cash provided by (used in) operating activities (GAAP) $ 5,117 $ 4,356 $ 5,357 $ 4,974 $ 4,843 $ 2,407 $ 1,432 $ 939 $ 429 $ 478 $ 315 $ 145 $ 95 $ 139 $ 84 $ 121 $ 55 $ 19 $ (1 ) Operating cash flow (non-GAAP)* $ 4,548 $ 4,333 $ 5,299 $ 4,675 $ 4,040 $ 2,426 $ 1,403 $ 897 $ 409 $ 443 $ 306 $ 139 $ 118 $ 68 $ 161 $ 88 $ 46 $ 16 $ 4 Balance Sheet Data (at end of period) Total assets $ 37,179 $ 29,914 $ 38,593 $ 30,764 $ 24,413 $ 16,114 $ 8,245 $ 4,572 $ 2,876 $ 2,287 $ 1,440 $ 851 $ 813 $ 953 $ 949 $ 572 $ 277 $ 126 $ 79 Long-term debt, net of current maturities $ 12,640 $ 12,295 $ 13,175 $ 10,178 $ 7,187 $ 5,286 $ 3,075 $ 2,058 $ 1,651 $ 1,329 $ 945 $ 964 $ 919 $ 509 $ 509 $ 268 $ 146 $ 48 $ 14 Stockholders’ equity (deficit) $ 15,264 $ 12,341 $ 17,017 $ 12,624 $ 11,366 $ 6,299 $ 3,163 $ 1,733 $ 908 $ 767 $ 313 $ (218 ) $ (249) $ 280 $ 287 $ 178 $ 45 $ 31 $ 31 Other Operating and Financial Data Proved reserves in natural gas equivalents (bcfe) 17,096 14,254 12,051 10,879 8,956 7,521 4,902 3,169 2,205 1,780 1,355 1,206 1,091 448 403 425 243 142 137 Future net natural gas and oil revenues discounted at 10% ** $ 15,146 $ 9,449 $ 15,601 $ 20,573 $ 13,647 $ 22,934 $ 10,504 $ 7,333 $ 3,718 $ 1,647 $ 6,046 $ 1,089 $ 661 $ 467 $ 437 $ 547 $ 188 $ 141 $ 142 Natural