Exhibit 99.1


Paul Ross


Kristyn Hutzell

Vice President—Finance, Treasurer and CFO


Avalon Investor Relations

(805) 987-8741


(512) 514-6046



February 7, 2007


·                  Q4 2006 revenue of $116.2 million, an increase of 80% compared with Q4 2005

·                  FY 2006 revenue of $338 million, an increase of 29% compared with FY 2005

·                  Profitability forecasted for Q107 with net revenue of $125 to $135 million

·                  Revenue guidance for fiscal 2007 reaffirmed at $530 million to $550 million

·                  Z-One® Digital Power Management  patent infringement Markman hearing concludes; design wins increase to approximately 80

Camarillo, CA, February 7, 2007 — Power-One, Inc. (NASDAQ: PWER) today announced that for the fourth fiscal quarter ended December 31, 2006,  net sales were $116.2 million and net loss was $0.16 per share, compared with revenue and a net income of $64.3 million and $0.04 per share, respectively, during the fourth quarter of 2005.  Revenue for the quarter exceeded the high-end of the Company’s guidance primarily due to better than expected performance by the recent acquisition of Magnetek’s Power Electronics Group and the Company’s continued progress within the faster growing markets for high-volume AC/DC projects.  The net loss for the quarter was attributable to an estimated $0.04 per share loss for the expected purchase accounting related to the fourth quarter acquisition and an estimated $0.08 per share loss for a number of charges specific to the fourth quarter of 2006, including an inventory write-down, an investment impairment, a restructuring charge, and certain other costs.

For the fiscal year ended December 31, 2006, net sales were $338 million.  The 29% year-over-year revenue growth was driven by organic growth as well as the addition of Magnetek’s Power Electronics group during the fourth quarter of 2006.  The Company ended fiscal 2006 with $89 million in 90-day backlog.

“We are extremely pleased with our revenue performance during the quarter and year and with the progress we are making on the integration of the Power Electronics Group,” said Bill Yeates, Chief Executive Officer.  “While our GAAP net income was affected by purchase accounting and other costs during the quarter that we believe are not indicative of our expected performance in 2007, as well as a shift in product mix toward higher-volume, lower-margin product where we are still climbing the learning curve and have not yet fully cost-reduced the programs, we were impressed by the overall performance of our teams working together and the progress we have already made in terms of revenue generation.  In January 2007, we announced our intent to close the newly-acquired California manufacturing facility and transfer all of its production to our low-cost facility in the Dominican Republic by the end of the second quarter of 2007.  These steps will further enhance Power-One’s margins and drive value for our shareholders.”

The following information was filed by Power One Inc on Wednesday, February 7, 2007 as an 8K 2.02 statement, which is an earnings press release pertaining to results of operations and financial condition. It may be helpful to assess the quality of management by comparing the information in the press release to the information in the accompanying 10-K Annual Report statement of earnings and operation as management may choose to highlight particular information in the press release.

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