Eon has selected Newhaven Port for the operations and maintenance of a proposed offshore wind farm.
The energy giant said the East Sussex port would be used to support the Rampion wind farm, subject to it being granted a development consent order.
The decision was hailed by council leaders as a massive boost for the local economy.
East Sussex County Council leader Peter Jones said: “We’ve campaigned for over two years at both regional and national level for this outcome on the wind farm issue so we’re absolutely delighted.
“This decision will ensure much needed and significant investment in Newhaven Port and most importantly will bring new jobs to the town. Another UK port could have been chosen for the contract but Newhaven has won the day”.