Locale : Global (English)
Create document Page
Review document
Page Added

Electrical solutions for an offshore wind farm

Moving wind energy to customers from eight miles off the coast of Wales.


Gwynt y Môr is a 750-megawatt wind farm located 13km off the coast of North Wales. With 160 wind turbines, it is the second largest offshore wind farm in the world.


Mott MacDonald undertook a feasibility study for the electrical system, including studies of load flow, short circuits, fault ride-through, and grid connection. We developed several concept designs for connecting wind farms to the grid.

Several high-voltage alternating current (HVAC) transmission voltage options and high-voltage direct current (HVDC) technologies were evaluated in terms of cost, maintenance, reliability, constructability, adaptability, and technology availability.

We worked closely with HVDC technology suppliers to obtain data on active and reactive power control, voltage control, and short circuit limitations.


Final commissioning for Gwynt y Môr was completed in June 2015. With an output of 1,950 gigawatt-hours per year, the wind farm can power around 400,000 homes.

Power transfer, transmission length, equipment layout, size, and weight were found to be the key parameters to determine where HVDC becomes cost-effective compared to HVAC systems.

icon-arrow-down-sml icon-arrow-left-lrg icon-arrow-left-sml icon-arrow-right-lrg icon-arrow-right-sml icon-arrow-up-sml icon-champions icon-close icon-download icon-education icon-email icon-grid-view icon-language icon-link-to icon-list-view icon-location icon-login-register icon-minus icon-more icon-phone icon-plus icon-recently-viewed icon-search icon hash key-facts-corner-sash quote-underline social-icon-facebook social-icon-googleplus social-icon-linkedin social-icon-twitter social-share-icon-facebook social-share-icon-facebook social-share-icon-googleplus social-share-icon-googleplus social-share-icon-instagram social-share-icon-instagram social-share-icon-linkedin social-share-icon-linkedin social-share-icon-twitter social-share-icon-twitter social-share-icon-youtube social-share-icon-youtube sina-weibo MM-Shape01-Quote-Views MM-Shape03-Quote-Locations MM-Shape05-Quote-Projects MM-Shape12-Quote-Sectors MM-Shape13-Quote-Expertise MM-Shape14-Quote-About-Us MM-Shape14-Quote-Careers checkmark icon-expand-view icon-apply-now menu sphere icon-cookies icon-legal icon-registered-companies target rotate-screen video-replay-flat video-replay audio-mute audio-play