Xetra (euro adhoc) -

  Notification concerning transactions by persons discharging managerial
  responsibilities pursuant to section 15a of the WpHG, transmitted by euro
  adhoc with the aim of a Europe-wide distribution. The issuer is responsible
  for the content of this announcement.

23.08.2007

Details of the person subject to the disclosure
requirement:

Name:              Jens-Peter Schmitt

Reason for the disclosure requirement:

Reason:            Person performing managerial responsibilities
Position:          Member of an administrative or supervisory body

Details of the transaction:
Description of financial instrument: nennwertlose Stückaktien

ISIN:                DE000AO6554
Type of transaction: purchase
Date:                23.08.2007
No of items:         5280
Currency:            Euro
Price:               29.93000
Total amount traded: 158,030.40
Place:               Xetra
Explanation:

Issuer subject to the publication requirement:

end of announcement                               euro adhoc 27.08.2007 13:31:13

Further inquiry note:

Branche: Alternative energy
ISIN: DE000A0D6554
WKN: A0D655
Index: CDAX, Prime All Share, Technologie All Share, TecDAX, HDAX,
Midcap Market Index
Börsen: Börse Frankfurt / regulated dealing/prime standard
Börse Berlin / free trade
Börse Stuttgart / free trade
Börse Düsseldorf / free trade
Börse München / free trade