According to a company spokesman, Enercon will "implement" the site in Norrbotten province, which is expected to be online in 2021.
The second phase for the complex had been approved at 1.3GW but has since been rationalised. Swedish grid operator Svenska Kraftnät will ensure a connection to the grid is available by July 2020.
Ground works at the site have already started, Enercon added.
Enercon said it is also currently installing turbines at the Ersträsk wind project, which forms part of the first phase of the Markbygden complex.
A total of 68 turbines will be built at the Ersträsk site. To date, 26 2.35MW E-103 EP2 turbines have been installed, with a further 42 3MW E-126 EP3 turbines set to be erected by the end of 2019.
Enercon also owns the 82.8MW Skogberget site, another project of the first phase of the complex completed in 2013.
Enercon acquired Skogberget, along with Ersträsk and the 1.1GW second phase of the project, from original developer Svevind in 2016.
The first phase of the 1,000-turbine complex also includes the 644.4MW Markbygden ETT project, owned by China Guangdong Nuclear Power (CGN) following its acquisition in July.
CGN bought the site from GE Financial Services and the Green Investment Group, after the consortium first acquired the site from original developer Svevind. GE Renewable Energy is expected to supply turbines to this site.