EXHIBIT 99.1
                                                                    ------------

             CHESAPEAKE ENERGY CORPORATION ANNOUNCES EXCHANGE OFFER
                                     FOR ITS
                   6.0% CUMULATIVE CONVERTIBLE PREFERRED STOCK

OKLAHOMA  CITY,  OKLAHOMA,  NOVEMBER  30, 2004 - Chesapeake  Energy  Corporation
(NYSE:  CHK)  announced that it intends to commence today an exchange offer (the
"Offer")  to  exchange  its common  stock for any and all of its  outstanding  4
million  shares  of  its  6.00%  Cumulative  Convertible  Preferred  Stock  (the
"Preferred Stock") (CUSIP Nos. 165167-70-1 and 165167-60-2(144A)).

The number of shares of common stock to be exchanged for each share of Preferred
Stock (the "Exchange Ratio") will be fixed after 5:00 p.m. New York City time on
Thursday,  December 23, 2004,  the Pricing Date, on the basis of the  applicable
pricing formula set forth herein, and publicly announced prior to the opening of
trading on Monday,  December 27, 2004.  The Exchange Ratio will equal the sum of
(i) 4.8605 shares of common stock, the number of shares into which the Preferred
Stock is presently  convertible and (ii) a number of additional shares of common
stock equal to $7.75 divided by the  arithmetic  daily  volume-weighted  average
price of our common stock,  over a ten day trading period  beginning on December
10, 2004 and ending on the Pricing Date. The Exchange Offer will be subject to a
maximum  of  5.5605  shares of common  stock and a minimum  of 5.1605  shares of
common stock per share of Preferred Stock.

The Preferred  Stock is listed on the New York Stock  Exchange  under the symbol
"CHKPrA", and Chesapeake's common stock is listed on the New York Stock Exchange
under the symbol "CHK".

The  exchange  offer  will  expire at 12:00  midnight,  New York City  time,  on
Tuesday, December 28, 2004, unless extended or earlier terminated by Chesapeake.
Holders may withdraw  tendered  shares of Preferred Stock at any time before the
exchange offer expires, or if not previously returned, a holder may withdraw any
tendered  shares of Preferred  Stock that are not accepted by  Chesapeake  on or
before January 26, 2005. The tender and withdrawal of shares of Preferred  Stock
pursuant to the Offer held in "street" name are subject to  compliance  with the
appropriate procedures of the automated tender offer procedures, or ATOP, system
of The Depositary Trust Company.

The Offer will be made pursuant to an exchange offer  prospectus  contained in a
Registration  Statement to be filed today by Chesapeake  with the Securities and
Exchange  Commission.  Copies of the  prospectus  contained in the  Registration
Statement may be obtained,  when made available,  from the Information Agent for
the Offer,  MacKenzie  Partners,  Inc., who may be reached at  800-322-2885  (US
toll-free) and 212-929-5500 (collect).  The Offer is subject to the satisfaction
of certain conditions.

The  Company  has  engaged  UBS  Securities  LLC  to act as  dealer  manager  in
connection with the Offer.  Questions regarding the Offer may be directed to UBS
Securities  LLC, 677 Washington  Blvd.,  Stamford,  CT 06901 at (888)  722-9555,
x4210 (US toll-free) and (203) 719-4210 (collect).

HOLDERS OF PREFERRED STOCK ARE URGED TO READ THE EXCHANGE OFFER  PROSPECTUS WHEN
IT BECOMES AVAILABLE  BECAUSE IT INCLUDES  IMPORTANT  INFORMATION.  THE EXCHANGE
OFFER  PROSPECTUS  AND OTHER RELATED  DOCUMENTS  FILED WITH THE  SECURITIES  AND
EXCHANGE  COMMISSION MAY BE OBTAINED FOR FREE FROM THE  INFORMATION  AGENT OR AT
THE COMMISSION'S WEBSITE, WWW.SEC.GOV.

A REGISTRATION  STATEMENT  RELATING TO THESE  SECURITIES HAS BEEN FILED WITH THE
SECURITIES  AND  EXCHANGE  COMMISSION  BUT HAS NOT YET BECOME  EFFECTIVE.  THESE
SECURITIES  MAY NOT BE SOLD NOR MAY OFFERS TO BUY BE ACCEPTED  PRIOR TO THE TIME
THE  REGISTRATION  STATEMENT  BECOMES  EFFECTIVE.  THIS PRESS  RELEASE SHALL NOT
CONSTITUTE  AN OFFER TO SELL OR THE  SOLICITATION  OF AN OFFER TO BUY NOR  SHALL
THERE BE ANY  SALES OF  THESE  SECURITIES  IN ANY  STATE  IN WHICH  SUCH  OFFER,
SOLICITATION OR SALE WOULD BE UNLAWFUL PRIOR TO  REGISTRATION  OR  QUALIFICATION
UNDER THE SECURITIES LAWS OF ANY SUCH STATE.

THIS DOCUMENT CONTAINS FORWARD-LOOKING  STATEMENTS WITHIN THE MEANING OF SECTION
27A OF THE SECURITIES ACT OF 1933 AND SECTION 21E OF THE SECURITIES EXCHANGE ACT
OF 1934.  FORWARD-LOOKING  STATEMENTS  INCLUDE  ESTIMATES  AND GIVE OUR  CURRENT
EXPECTATIONS   OR   FORECASTS  OF  FUTURE   EVENTS.   ALTHOUGH  WE  BELIEVE  OUR
FORWARD-LOOKING  STATEMENTS ARE  REASONABLE,  THEY CAN BE AFFECTED BY INACCURATE
ASSUMPTIONS OR BY KNOWN OR UNKNOWN RISKS AND UNCERTAINTIES.

CHESAPEAKE  ENERGY  CORPORATION  IS THE SIXTH  LARGEST  INDEPENDENT  NATURAL GAS
PRODUCER IN THE U.S.  HEADQUARTERED  IN OKLAHOMA CITY, THE COMPANY'S  OPERATIONS
ARE FOCUSED ON EXPLORATORY  AND  DEVELOPMENTAL  DRILLING AND PRODUCING  PROPERTY
ACQUISITIONS IN THE MID-CONTINENT,  PERMIAN BASIN, SOUTH TEXAS, TEXAS GULF COAST
AND ARK-LA-TEX REGIONS OF THE UNITED STATES.