Vacon - Company Announcement

American Superconductor Corporation and The Switch agree on extension of completion of sale

Vacon Plc, Stock Exchange Release, 14 June 2011 at 9.30 am

Vacon Plc and the other shareholders in The Switch Engineering Oy signed a
definitive agreement on 12 March 2011 to transfer all of their shares in The
Switch Engineering Oy to American Superconductor Corporation.

On 7 June 2011, American Superconductor Corporation and The Switch Engineering
Oy shareholders agreed on the extension of the completion of the sale until 30
June 2011.

Vacon Plc

Further information:

  * Vesa Laisi, President and CEO, Vacon Plc, tel. +358 40 8371 510, email
    vesa.laisi(at)vacon.com
  * Sebastian Linko, Director, Corporate Communications and Investor Relations,
    Vacon Plc, tel. +358 40 8371 634, email sebastian.linko(at)vacon.com

Vacon in brief:

Vacon is driven by a passion to design, manufacture and sell only the best AC
drives on the planet - and nothing else. AC drives can be used to control
electric motors or to help generate power from renewable sources. Vacon has R&D
and production units in Finland, the United States, China and Italy, and sales
offices in 27 countries. In 2010, Vacon had revenues of EUR 338 million and
globally employed 1,300 people. Vacon's shares (VAC1V) are listed and publicly
traded on the Helsinki Stock Exchange.

Driven by Drives, www.vacon.com

Distribution:

NASDAQ OMX Helsinki
Financial Supervisory Authority
Main Media

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