The two companies have signed a letter of intent to start exclusive negotiations about developing the project pipeline.
Enea would have a minority share in investment projects with Iberdrola.
It is the latest case of established offshore wind developers partnering with Polish energy companies to gain access to the nascent market.
Equinor is working with Polish utility Polenergia to develop two offshore wind farms with a combined capacity 1.2GW, while Ørsted is discussing options with Polish state-controlled utility Polska Grupa Energetyczna about buying into 2.5GW of projects.
Meanwhile, RWE is developing a 1.5GW-plus pipeline of offshore wind farms in the Polish Baltic Sea.
Poland aims to award more than 10GW of offshore wind capacity, according to its draft Offshore Wind Act, which was published earlier this year.
Under the proposals, Poland’s energy regulator would select up to 4.6GW by the end of 2022, before tendering an additional 5.5GW across at least three rounds between 2023 and 2028.
Meanwhile, Enea aims to have renewables to account for 22% of its electricity by 2025 and 33% by 2030.