Power-One's Stockholders Approve Acquisition by ABB Ltd.

Power-One's Stockholders Approve Acquisition by ABB Ltd.

CAMARILLO, Calif., July 23, 2013 (GLOBE NEWSWIRE) -- Power-One, Inc.
(Nasdaq:PWER), a leading provider of renewable energy and energy-efficient
power conversion and power management solutions, announced that at its special
meeting of stockholders held today, the stockholders approved the adoption of
the merger agreement, pursuant to which ABB (NYSE:ABB) will acquire Power-One
for $6.35 per share of Power-One common stock.

According to the final tally of shares voted, approximately 98.0 percent of
the shares voting at today's meeting voted in favor of the proposal to adopt
the merger agreement. These shares represented approximately 73.3 percent of
the total outstanding shares of Power-One common stock as of the June 18, 2013
record date for the meeting. All of the issued and outstanding shares of the
Company's Series C Junior Participating Convertible Preferred Stock voted in
favor of the proposal to adopt the merger agreement. In addition, the
stockholders also approved the nonbinding advisory compensation proposal
included in the proxy statement filed on June 20, 2013.

As previously announced, on April 21, 2013, ABB agreed to acquire Power-One in
an all-cash transaction valued at approximately $1.0 billion.

The transaction has already received the required antitrust approvals and
Power-One and ABB expect to complete the transaction by the end of this week.

About Power-One

Power-One is a leading provider of renewable energy and energy-efficient power
conversion and power management solutions and is the world's second largest
designer and manufacturer of photovoltaic inverters. Its renewable energy
products enable the industry's highest yielding conversion of power from solar
arrays for use by utilities, commercial enterprises and homes. Power-One has a
40 year history as the leader in high efficiency and high density power supply
products for a variety of industries including Renewable Energy, Servers,
Storage & Networking, Industrial and Network Power Systems. The company is
headquartered in Camarillo, CA and has global sales offices, manufacturing,
and R&D operations in Asia, Europe, and the Americas. Power-One is traded on
NASDAQ under the ticker symbol PWER. For more information, please visit

About ABB

ABB (www.abb.com) is a leader in power and automation technologies that enable
utility and industry customers to improve their performance while lowering
environmental impact. The ABB Group of companies operates in around 100
countries and employs about 145,000 people. In the United States, ABB had
revenues of $6.7 billion and its workforce grew to nearly 20,000 employees in

Important Information Regarding Forward-Looking Statements

Forward-Looking Statements

This press release includes forward-looking statements within the meaning of
the Private Securities Litigation Reform Act of 1995. These forward-looking
statements include, among others, statements regarding the expected synergies
and benefits of a potential combination of Power-One and ABB, including the
effect on Power-One's operations, business, economic and political
environment. Actual results may be materially different from any future
results expressed or implied by such forward-looking statements. Among other
risks and uncertainties, there can be no guarantee that the acquisition will
be completed, or if it is completed, that it will close within the anticipated
time frame. Additional risks and uncertainties relating to the acquisition
include: (1) conditions to the closing of the transaction may not be satisfied
or waived; (2) the transaction may involve unexpected costs, liabilities or
delays; (3)Power-One's business may suffer as a result of uncertainty
surrounding the transaction; (4)the outcome of any legal proceedings related
to the transaction; (5)the occurrence of any event, change or other
circumstances that could give rise to the termination of the Merger Agreement;
(6)the ability to recognize benefits of the transaction; (7)risks that the
transaction disrupts current plans and operations and the potential
difficulties in employee retention as a result of the transaction; and
(8)other risks to consummation of the transaction, including the risk that
the transaction will not be consummated within the expected time period or at
all. For a discussion of relevant factors, risks and uncertainties that could
materially affect Power-One's future results, attention is directed to "Item
1A. Risk Factors" and "Item 7. Management's Discussion and Analysis of
Financial Condition and Results of Operations" in its Annual Report on
Form10-K for the year ended December30, 2012 and in all reports on Forms
10-Q and 8-K filed with the Securities and Exchange Commission by Power-One
subsequent to the filing of its Form 10-K for the year ended December 30,
2012. Power-One undertakes no obligation to publicly release any revisions to
any forward-looking statements contained in this press release to reflect
events or circumstances occurring after the date of this release or to reflect
the occurrence of unanticipated events.

CONTACT: Investor Relations Contact:
         Larry Clark
         Investor Relations for Power-One
         (310) 478-2700 ext. 29

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