Dong Energy said the office and warehouse building at Seacombe on Merseyside will serve its two offshore wind farms in the area.
Up to 75 jobs will be created during the construction phase, with 45 workers permanently employed when the site is operational.
Brent Cheshire, Dong Energy's UK chairman, said: "The site offers excellent offshore access and flexibility, which is exactly what we need to efficiently operate and maintain our wind farms."
As part of the development, DONG Energy has committed to carry out work on the river promenade adjacent to the site which will improve the public amenity. This scheme has been developed through close cooperation with Wirral Council.
The announcement comes during the International Festival for Business 2016 in Liverpool, of which DONG Energy is an official supporter.