The agreement with National Grid is for three 1GW connections covering in Yorkshire and Teesside, north-east England.
One of the 1GW connections is between the first stage of the project and the Creyke Creek substation at Cottingham. Another 2GW of grid capacity was signed in 2010.
The other two 1GW grid connections will be routed from the second stage of the project to as yet unspecified locations within the Teesside area.
Speaking about the deal, Forewind head of electrical systems, David Flood, said: "Both organisations have worked extremely hard on this agreement, which demonstrates Forewind’s ambitions and the appetite of our parent companies to take these projects forward.
"We can now proceed with determining the optimum onshore cable routes and coastal cable landfall points to connect a total of six offshore wind farms to the electricity network.
"Securing further capacity close to our existing connection agreements offers the opportunity to reduce the impact of the projects, which could provide clean electricity to millions of homes."
Forewind is a consortium featuring RWE, Scottish and Southern Electricity, Statoil and Statkraft, formed to develop the Dogger Bank offshore zone.
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