With a capacity of 1.2 gigawatts (GW), when built Hornsea Project One will be the first windfarm in the world with over 1GW, capable of providing enough renewable energy for well over one million homes.
Hornsea Project One Programme director Duncan Clark said: "Hornsea Project One is truly a pioneering project for the UK and for the electricity sector.
"When built it will become the world's largest offshore windfarm by a considerable margin, helping to support Government ambitions to meet carbon reduction targets."
JDR is a leading provider of technology that connects the offshore energy industry, and it has state of the art manufacturing facilities in Hartlepool, UK.
Duncan said: "We are committed to investing in the UK and it's great to award a significant contract like this to a UK-based company which we know offers high-quality design and reliable delivery in harsh offshore environments."
DONG Energy and JDR have a framework agreement in place to enhance current designs and develop new technologies and processes to improve the quality and price of subsea power cables.
The contract announced today is the largest array cable award in JDR's history and will see the company design and manufacture 242km of array cables, covering two thirds of the total wind farm capacity.
JDR will also provide terminations, hang-off arrangements and additional accessories as well as services at the site.
JDR CEO, David Currie said: "This contract award demonstrates our leadership position in the array cable market and is the second award to date for JDR under our partnership agreements with DONG Energy.
"Our collaboration is encouraging technology development to support technical and commercial cost reduction, which is a critical element of our long-term strategy.
"We are proud to play a key role in this world-leading infrastructure project and continue our dedicated support to ensuring success for DONG Energy."
Earlier this year DONG Energy announced contracts with JDR and two other UK firms to supply and install array cables for Race Bank wind farm.
Array cables connect each of the wind turbines in the offshore wind farm via the offshore substation, to the main export cable that transmits the electricity generated back to shore and into the national grid.
Minister of State for Energy and Intellectual Property at the Department for Business, Energy and Industrial Strategy Baroness Neville-Rolfe said: "We are building a strong, competitive UK supply chain to support our leading offshore wind industry. Businesses in the UK have greater certainty than ever before thanks to Government support.
"This agreement between JDR Cables and DONG Energy is a great example of how this newfound certainty can drive local jobs and growth through the UK supply chain."
