Public Information – Issued by DEWI-OCC GmbH

DEWI-OCC Offshore and Certification Centre GmbH

DEWI-OCC Offshore and Certification Centre (DEWI-OCC) is a limited liability company “GmbH”. DEWI-OCC is 100% owned by Deutsche Windenergie-Institut GmbH (DEWI) [German Wind Energy Institute] and through its organizational structure a part of the UL family of companies. By that DEWI-OCC can make use of UL´s tools and resources as needed. DEWI-OCC is entered in the commercial register at Bremen District Court under the name DEWI-OCC Offshore and Certification Centre GmbH (DEWI-OCC) under HRB 35702.

The requirements of ISO 9001:2015 “Quality management systems —Requirements” and DIN EN ISO/IEC 17065:2013 “Conformity assessment – Requirements for bodies certifying products, processes and services” constitute the basis of the quality management system.

Important Information :

Certification Regulations


General Terms of Contract


Accreditation Scope

Accreditation  ISO 17065:2012

Certification ISO 9001:2015

List of  Certificates


News and updates for Clients and Certificate holders:

  1. DEWI-OCC recently concluded its surveillance and Scope extension for Grid Integration Services. With the completion of this surveillance and Scope extension DEWI-OCC has added the Saudi Arabian Grid Code into its arsenal of Grid Codes for which it is competent.
  2. UL’s test lab from Germany purchased the Power Generation System Control Simulator from Hanse SCADA. With this PGS Control Simulator, UL is now able to perform Power Plant Control Systems in their lab, or at the manufacturer facility, according to FGW TG3 Rev.25 or other international standards. Contact for more information.
  3. UL has officially announced that DEWI-OCC, an independent certification body within UL, has achieved reaccreditation from Deutsche Akkreditierungsstelle GmbH (DAkkS) to provide certification for offshore wind turbines and their components. This expanded offering will make UL’s independent certification body a leading provider of wind turbine and grid code certification services. Read the full press release here:
  4. UL has received customer satisfaction for the first successful commissioning of a Hybrid Management System in a renewable power plant high voltage substation in Germany. To learn more, please contact