Gwynt y Mor Offshore Wind farm is a proposed 576 MW offshore wind power plant located off the coast of North Wales. Planning consent for the project was granted on the 3rd of December 2008, and construction is expected to begin in 2011 with final commissioning in 2014.

The Gwynt y Mor Offshore Wind farm project has a value of 2 billion Euros, of which 1.2B goes to Siemens for turbines and electrical connections.

With 160 turbines of 3.6MW Siemens SWT-3.6-107, Gwynt y Môr will be Wales' largest wind farm. The expected output of 1,950 GWh per year is capable of powering around 400,000 homes, or 40% of the homes in Wales, and preventing the release of about 1.7 million tonnes of carbon dioxide every year.

As with all offshore wind farms in the UK, the seabed at Gwynt y Môr is owned by the Crown Estates, which has agreed to lease the land to npower renewables. The wind farm will be located in close proximity to the existing North Hoyle and Rhyl Flats offshore wind farms. All of these projects are wholly or partly owned by RWE npower renewables, a subsidiary of German company RWE. In the case of Gwynt y Môr, RWE holds 60%, Stadtwerke München holds 30%, and Siemens holds 10%.