NOT FOR DISTRIBUTION TO U.S. NEWS WIRE SERVICES OR FOR DISSEMINATION IN THE UNITED
STATES, AUSTRALIA, CANADA OR JAPAN

The shares of Norsk Hydro ASA (Hydro) will trade exclusive of the right to receive
subscription rights in the rights issue from and including today, June 22, 2010.

See announcements from yesterday for further information on the rights issue.

Investor contact
Contact Stian Hasle
Cellular +47 97736022
E-mail Stian.Hasle@hydro.com

*********
This announcement is not an offer for sale of securities in the United States or any
other country. The securities referred to herein have not been registered under the U.S.
Securities Act of 1933, as amended (the “U.S. Securities Act”), and may not be sold in
the United States absent registration or pursuant to an exemption from registration
under the U.S. Securities Act. Hydro does not intend to register any portion of the
offering of the securities in the United States or to conduct a public offering of the
securities in the United States. Any offering of securities will be made by means of a
prospectus that may be obtained from Hydro and that will contain detailed information
about the company and management, as well as financial statements. Copies of this
announcement are not being made and may not be distributed or sent into the United
States, Canada, Australia, Japan or any other jurisdiction in which such distribution
would be unlawful or would require registration or other measures.

In any EEA Member State that has implemented Directive 2003/71/EC (together with any
applicable implementing measures in any member State, the “Prospectus Directive”), this
communication is only addressed to and is only directed at qualified investors in that
Member State within the meaning of the Prospectus Directive.

This announcement is only directed at (a) persons who are outside the United Kingdom; or
(b) investment professionals within the meaning of Article 19 of the Financial Services
and Markets Act 2000 (Financial Promotion) Order 2005 (the “Order”); or (c) persons
falling within Article 49(2)(a) to (d) of the Order; or (d) persons to whom any
invitation or inducement to engage in investment activity can be communicated in
circumstances where Section 21(1) of the Financial Services and Markets Act 2000 does
not apply.

Certain statements included within this announcement contain forward-looking
information, including, without limitation, those relating to (a) forecasts, projections
and estimates, (b) statements of management’s plans, objectives and strategies for
Hydro, such as planned expansions, investments or other projects, (c) targeted
production volumes and costs, capacities or rates, start-up costs, cost reductions and
profit objectives, (d) various expectations about future developments in Hydro’s
markets, particularly prices, supply and demand and competition, (e) results of
operations, (f) margins, (g) growth rates, (h) risk management, as well as (i)
statements preceded by “expected”, “scheduled”, “targeted”, “planned”, “proposed”,
“intended” or similar statements.

Although we believe that the expectations reflected in such forward-looking statements
are reasonable, these forward-looking statements are based on a number of assumptions
and forecasts that, by their nature, involve risk and uncertainty. Various factors
could cause our actual results to differ materially from those projected in a
forward-looking statement or affect the extent to which a particular projection is
realized. Factors that could cause these differences include, but are not limited to:
our continued ability to reposition and restructure our upstream and downstream
aluminium business; changes in availability and cost of energy and raw materials; global
supply and demand for aluminium and aluminium products; world economic growth, including
rates of inflation and industrial production; changes in the relative value of
currencies and the value of commodity contracts; trends in Hydro’s key markets and
competition; and legislative, regulatory and political factors.

No assurance can be given that such expectations will prove to have been correct. Hydro
disclaims any obligation to update or revise any forward-looking statements, whether as
a result of new information, future events or otherwise.

This information is subject of the disclosure requirements acc. to §5-12 vphl (Norwegian
Securities Trading Act)