The contract has been awarded by energy company Centrica, which holds the rights to develop Rhiannon in partnership with Dong Energy.
The met mast contract represents the latest step forward for the project since last July’s submission of an environmental impact assessment scoping report to the UK Planning Inspectorate.
Initial public exhibitions outlining the Rhiannon plans have been taking place this month in North Wales.
The met mast will be located 15 kilometres north of the island of Anglesey. In addition to a full suite of meteorological measurement equipment, the structure will also feature a power supply system and navigational aids, said GL Garrad Hassan.
"We’re delighted to be delivering to this high-profile Round 3 project and have the opportunity to use what our Measnet-accredited measurement group has learned over the past decade from working in the challenging offshore environment in the Irish Sea, North Sea, Baltic and Canada," said Colin Morgan, GL Garrad Hassan’s head of offshore wind practice.
GL Garrad Hassan declined to comment on the likely timing of the installation project and about whether the met mast will be based on existing, "conventional" technology or on emerging options, such as floating lidar.
The project will comprise between 147 and 440 turbines. If the developer installs the maximum number of turbines and capacity, the machines will be 5MW.