Century Aluminum Company - Company Announcement

Century, Big Rivers and Kenergy File Definitive Energy Agreements With the Kentucky Public Service Commission

CHICAGO, IL--(Marketwired - June 12, 2013) - Century Aluminum of Kentucky, a
wholly owned subsidiary of Century Aluminum Company (NASDAQ: CENX), Kenergy
Corp. and Big Rivers Electric Corp. today announced that they have finalized
and filed with the Kentucky Public Service Commission definitive agreements
between the parties based on the tentative agreement reached in April. These
agreements and the filing are a first step in finalizing the tentative
agreement. The agreement is subject to approvals from various third parties,
including the Kentucky Public Service Commission, the USDA Rural Utilities
Service and other regulatory agencies. The parties will continue to move as
expeditiously as possible to finalize the agreement in advance of the
expiration of the current power contract on August 20, 2013. 

The Hawesville smelter, located in Hancock County, KY, has a rated capacity of
244,000 tonnes of primary aluminum and employs approximately 650 men and women. 

Century Aluminum Company, the parent of Century Aluminum of Kentucky, owns
primary aluminum capacity in the United States and Iceland. Century's corporate
offices are located in Chicago, Illinois. More information can be found at
www.centuryaluminum.com. 

Big Rivers Electric Corporation is a member-owned, not-for-profit, wholesale
electric generation and transmission cooperative headquartered in Henderson,
Kentucky that is owned by three distribution cooperative Members -- Jackson
Purchase Energy Corporation, headquartered in Paducah; Kenergy Corp,
headquartered in Henderson; and Meade County Rural Electric Cooperative
Corporation, headquartered in Brandenburg. These Member cooperatives deliver
retail electric power and energy to over 113,000 residential, commercial, and
industrial customers in portions of 22 western Kentucky counties. 

Kenergy Corp. is a nonprofit electric cooperative that serves 55,282 members in
14 counties in western Kentucky, including Breckinridge, Caldwell, Crittenden,
Daviess, Hancock, Henderson, Hopkins, Livingston, Lyon, McLean, Muhlenberg,
Ohio, Union and Webster. 

Cautionary Statement

This press release contains "forward-looking statements" within the meaning of
the Private Securities Litigation Reform Act of 1995. Forward-looking
statements are statements about future, not past, events and involve certain
important risks and uncertainties, any of which could cause our actual results
to differ materially from those expressed in our forward-looking statements.
Such risks and uncertainties may include, without limitation, whether or not
the parties are able to obtain all necessary approvals and consents, whether or
not certain proposed equipment upgrades are agreed to and completed and whether
or not the market pass through arrangement can be completed prior to the
expiration of the current power contract. Forward-looking statements in this
press release include statements regarding the completion of an agreement to
provide, and the ultimate provision of, market priced power to the Hawesville
smelter. More information about these risks, uncertainties and assumptions can
be found in the risk factors and forward-looking statements cautionary language
contained in our Annual Report on Form 10-K and in other filings made with the
Securities and Exchange Commission. We do not undertake, and specifically
disclaim, any obligation to revise any forward-looking statements to reflect
the occurrence of future events or circumstances. 

Certified Advisors for the First North market of the OMX Nordic Exchange
Iceland hf. for Global Depositary Receipts in Iceland: 

Atli B. Gudmundsson, Senior Manager -- Corporate Finance, Landsbankinn hf.
Steingrimur Helgason, Director -- Corporate Finance, Landsbankinn hf.

Century Aluminum Contacts:
Mike Dildine (media)
831-642-9364

Shelly Harrison (investors)
831-642-9357