In addition to the submarine cable installation works, Seaway 7 will undertake a pre-installation submarine cable route survey, perform pre-installation boulder clearance activities and execute post-lay trenching services.
According to the company, the inter-array grid cable system consists of 165 66kV copper-core submarine composite cables with a total length of more than 420km.
Project engineering will commence immediately, with offshore activities due to commence in 2021.
"We look forward to continuing our collaborative relationship with Ørsted to install the entire inner array grid cable system on the Hornsea Two offshore wind farm project," said Steph McNeill, Subsea 7's SVP Renewables and Heavy Lifting.
"This award follows on from our reliable performance and successful completion of the installation activities for the Hornsea One offshore wind farm project earlier this year."
JDR Cables is in charge of the design and manufacture of 100km of inter-array cables, with Prysmian supplyingover 300km of the 66kV cables.
Hornsea Project Two is located some 90km off the Yorkshire coast and will comprise 165 Siemens Gamesa 8MW turbines. The 1.4GW offshore wind farm is scheduled to be commissioned in 2022.