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Industry Offshore construction and services
Founded 2000
Headquarters Fredericia, Denmark
Key people
Jens Frederik Hansen (CEO)
Services transport, installation, and servicing of offshore wind farms
Parent DONG Energy
Website www.a2sea.com

A2SEA is an offshore wind farm installation and services company based in Fredericia, Denmark. The company specializes in transport, installation, and servicing of offshore wind farms.[1] In addition to Denmark, the company has subsidiaries in the United Kingdom and Germany.


A2SEA was established in 2000. In 2001, M/S Ocean Ady (now: Sea Energy) and M/S Ocean Hanne (now: Sea Power) were converted into turbine installation vessels. The company's first installation work was the Horns Rev 1 wind farm in the North Sea in 2002.[2] In following years the company installed among others the Frederikshavn, Nysted, Arklow Bank, Scroby Sands, Kentish Flats and Thanet, and got contracts for the installation works on London Array and Ormonde offshore wind farms.[3]

In 2009, the company was acquired by the Danish energy company DONG Energy. In 2010, it was announced that Siemens Wind Power will acquire a 49% stake in the company at a price of DKK 860m.[1][2] The deal needed an approval of regulatory authorities,[4] which came on 13 October 2010.[5]

In 2010, turnover was 586m DKK, while profit was 86m.[6]


A2SEA has fleet of two semijacked vessels (Sea Energy and Sea Power) and two jack-ups (Sea Jack and Sea Worker), all of them specially converted for offshore wind turbines installation. In 2010, A2SEA ordered a new semijacked vessel Sea Installer which is the first specially designed wind generator installation vessel of its fleet.[2][7]

In early 2016 the barge Sea Worker was grounded off Nymindegab, Denmark after its tow cable broke during bad weather.[8] Approximately 1 week later the vessel capsized.[9][10]


  1. ^ a b "Siemens to become shareholder in A2SEA". The Engineer. Centaur Media plc. 29 June 2010. Retrieved 14 July 2010. 
  2. ^ a b c Stromsta, Karl-Erik (12 July 2010). "A2SEA signs $139m contract for offshore wind installation vessel". ReCharge. NHST Media Group. Retrieved 14 July 2010. 
  3. ^ "A2SEA presentation" (PDF). A2SEA. Export Promotion Denmark. 12 April 2005. Retrieved 14 July 2010. 
  4. ^ "Siemens catches wind with A2Sea move". Upstream Online. NHST Media Group. 29 June 2010. (subscription required). Retrieved 14 July 2010. 
  5. ^ Antitrust authority approves Siemens as equity partner in A2SEA DONG Energy, 13 October 2010. Retrieved: 16 November 2010.
  6. ^ Pedersen, Lars Dalsgård. A2SEA profits Energy Supply, 21 March 2011. Accessed: 9 October 2011.
  7. ^ "Dong orders $139m vessel from Cosco". Upstream Online. NHST Media Group. 12 July 2010. (subscription required). Retrieved 14 July 2010. 
  8. ^ "15 crew safe after A2Sea rescue", renews.biz, 27 January 2016 
  9. ^ "Sea Worker capsizes off Denmark", renews.biz, 3 February 2016 
  10. ^ "Sea Worker er væltet i nattens blæst", www.tsyvd.dk (in Danish), 3 February 2016 

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