(Bloomberg) -- A 9 billion-euro ($9 billion) offshore wind power hub planned in the Baltic Sea will mark a significant step in the process of weaning Europe off its reliance on Russian gas, according to the German and Danish governments.

The so-called Bornholm Energy Island will link several wind parks and distribute the energy they produce between the two countries. The project will have capacity of more than 3 gigawatts -- enough power for as many as 4.5 million households -- after it begins operation in 2030.

“It’s the first time in Europe that two countries cooperate on such a project,” German Energy Minister Robert Habeck said in a phone interview with Bloomberg on Sunday. 

The project will need 3 billion euros of investment for infrastructure and 6 billion euros for the offshore wind park, according to the Danish government.

The German network operator 50Hertz and its Danish counterpart Energinet, which will build the energy hub and the connection to the mainland, will share both the costs and profits of the project. 

“We will make sure that this will also be a lucrative deal for tax payers,” Danish Energy Minister Dan Joergensen said. “You need a lot of trust and willingness between two countries to be able to shoulder a project of this magnitude.”

‘Energy Island’

After it’s up and running, other Baltic states and Poland will have the chance to join the project. 

Both Germany and Denmark have agreed that any new partner will need the approval of both sides. Germany is especially concerned about the impact any rerouting of the energy flow could have on electricity supply.

The “energy island” will run close to the big pipelines channeling Russian gas into Europe, said Habeck, who is also Germany’s vice chancellor. “But now it will be our own renewable energy and no longer Russian gas,” he said.

The European Commission aims to increase Europe’s offshore wind capacity from its current level of 12 gigawatts to 300 gigawatts by 2050.

(Updates with detail of number of households in second paragraph; a previous version corrected the spelling of the project name and the German network operator)

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