Exhibit 99.1

FOR IMMEDIATE RELEASE
For more information, contact:

MidAmerican Energy Holdings Company:
Sara Schillinger/Ann Thelen
515-281-2785

Constellation Energy:
Robert L. Gould/Debra Larsson
410-470-7433

Constellation Energy - Investor Contacts:
Kevin Hadlock, 410-470-3647
Janet Mosher, 410-470-1884

              MidAmerican and Constellation Energy Make Regulatory
                     Filings Related to MidAmerican's Merger
                            with Constellation Energy

     DES MOINES, Iowa, and BALTIMORE - Oct. 3, 2008 - MidAmerican Energy
Holdings Company and Constellation Energy (NYSE: CEG) today announced they have
made regulatory filings with the U.S. Nuclear Regulatory Commission (NRC) and
the Federal Communications Commission (FCC) related to MidAmerican's proposed
merger with Constellation Energy.

     The companies jointly filed an application with the NRC seeking the
agency's consent to the indirect transfers of control of NRC licenses for
Constellation Energy's Calvert Cliffs Nuclear Power Plant, Units 1 & 2; Calvert
Cliffs Independent Spent Fuel Storage Installation Facility; Nine Mile Point
Nuclear Station, Units 1 & 2; and R. E. Ginna Nuclear Power Plant. MidAmerican
and Constellation Energy also jointly filed with the FCC for approval to
transfer certain communication licenses to MidAmerican from Constellation
Energy.

     "These filings are significant steps in obtaining regulatory approval of
our merger with Constellation Energy," said Gregory E. Abel, president and chief
executive officer of MidAmerican. "This will allow Constellation Energy to
continue its excellent nuclear operating record, with the backing of MidAmerican
and Berkshire Hathaway. Importantly, it positions the combined organization as a
leading United States owner/operator of noncarbon resources, delivering
long-term benefits to the nation."

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Regulatory Filings/Page 2

     "We're very proud that our nuclear group has earned a reputation as one of
the most capable operators nationwide, and we very much intend to maintain and
build on that reputation as part of the MidAmerican family," said Mayo A.
Shattuck III, chairman, president and chief executive officer of Constellation
Energy. "The merger approval process is off to a good start, and we're committed
to keeping it on track and moving expeditiously."

     MidAmerican and Constellation Energy announced Sept. 19, 2008, the
companies had reached a definitive merger agreement in which MidAmerican will
purchase all of the outstanding shares of Constellation Energy for a cash
consideration of approximately $4.7 billion, or $26.50 per share. The definitive
agreement has been approved by both companies' boards of directors and is
subject to, among other things, shareholder and customary federal and state
regulatory approvals.

About Constellation Energy

Constellation Energy (www.constellation.com), a FORTUNE 125 company with 2007
revenues of $21 billion, is the nation's largest competitive supplier of
electricity to large commercial and industrial customers and the nation's
largest wholesale power seller. Constellation Energy also manages fuels and
energy services on behalf of energy intensive industries and utilities. It owns
a diversified fleet of 83 generating units located throughout the United States,
totaling approximately 9,000 megawatts of generating capacity. The company
delivers electricity and natural gas through the Baltimore Gas and Electric
Company (BGE), its regulated utility in Central Maryland.

About MidAmerican Energy Holdings

MidAmerican Energy Holdings Company, based in Des Moines, Iowa, is a global
provider of energy services. Through its energy-related business platforms,
MidAmerican provides electric and natural gas service to more than 6.9 million
customers worldwide. These business platforms are Pacific Power, Rocky Mountain
Power and PacifiCorp Energy, which comprise PacifiCorp; MidAmerican Energy
Company; CE Electric UK; Northern Natural Gas Company; Kern River Gas
Transmission Company; and CalEnergy. Information about MidAmerican is available
at www.midamerican.com.


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Forward-Looking Statements and Additional Information

This press release contains forward-looking statements within the meaning of the
Private Securities Litigation Reform Act of 1995, including, but not limited to,
statements relating to the proposed transaction between Constellation Energy and
MidAmerican Energy Holdings Company and the expected timing and completion of
the transaction. Words such as "anticipate," "believe," "plan," "estimate,"
"expect," "intend," "will," "should," "may" and other similar expressions are
intended to identify forward-looking statements. Such statements are based upon
the current beliefs and expectations of our management and involve a number of
significant risks and uncertainties, many of which are difficult to predict and
generally beyond the control of Constellation Energy and MidAmerican. Actual
results may differ materially from the results anticipated in these
forward-looking statements. The following factors, among others, could cause or
contribute to such material differences: the ability to obtain the approval of
the transaction by Constellation Energy's shareholders; the ability to obtain
governmental approvals of the transaction or to satisfy other conditions to the
transaction on the terms and expected time frame or at all; transaction costs;
economic conditions; and the effects of disruption from the transaction making
it more difficult to maintain relationships with employees, customers, other
business partners or government entities. Additional factors that could cause
our results to differ materially from those described in the forward-looking
statements can be found in the 2007 Annual Report on Form 10-K for the year
ended December 31, 2007, filed with the Securities and Exchange Commission and
in the proxy statement Constellation Energy intends to file with the Securities
and Exchange Commission and mail to its shareholders with respect to the
proposed transaction, each of which are or will be available at the Securities
and Exchange Commission's Web site (http://www.sec.gov) at no charge.

This communication is being made in respect of the proposed merger transaction
involving Constellation Energy and MidAmerican Energy Holdings Company. In
connection with the proposed transaction, Constellation Energy will file with
the Securities and Exchange Commission a proxy statement and will mail the proxy
statement to its shareholders. Shareholders are encouraged to read the proxy
statement regarding the proposed transaction when it becomes available because
it will contain important information. Shareholders will be able to obtain a
free copy of the proxy statement, as well as other filings made by Constellation
Energy regarding Constellation Energy, MidAmerican Energy Holdings Company and
the proposed transaction, without charge, at the Securities and Exchange
Commission's Web site (http://www.sec.gov). These materials also can be
obtained, when available, without charge, by directing a request to
Constellation Energy per the investor relations contact information below.

Constellation Energy, MidAmerican Energy Holdings Company and their respective
directors and executive officers and other persons may be deemed to be
participants in the solicitation of


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Regulatory Filings/Page 4


proxies in respect of the proposed transaction. Information regarding
Constellation Energy's directors and executive officers is available in
Constellation Energy's notice of annual meeting and proxy statement for its most
recent annual meeting and Constellation Energy's Annual Report on Form 10-K for
the year ended December 31, 2007, which were filed with the Securities and
Exchange Commission February 27, 2008, and April 29, 2008, respectively. Other
information regarding the participants in the solicitation and a description of
their direct and indirect interests, by security holdings or otherwise, will be
contained in the proxy statement and other relevant materials to be filed with
the Securities and Exchange Commission.

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