Bidders must submit proposals of 400MW, and can submit alternative bids between 200MW and approximately 800MW, according to the terms of the tender.
They will be competing to sign 15-to-20-year contracts with four Massachusetts power distribution companies.
The tender is the east coast state’s second solicitation and is part of a programme to have 1.6GW of offshore wind operational before 2027.
Confidential bids are due 9 August, with public bids due a week later on 16 August.
Winners are due to be revealed on 8 November and contracts are to be negotiated and signed by 13 December, ahead of final documents being submitted to the state’s department of public utilities on 10 January 2020.
A 50:50 joint venture (JV) of Copenhagen Infrastructure Partners and Avangrid Renewables secured a contract for its 800MW Vineyard Wind project in Massachusetts’ first offshore wind tender in May 2018.
Equinor Wind, Mayflower Wind Energy (a JV of oil and gas major Shell with the US arm of Portuguese developer EDP Renovaveis), and the Vineyard Wind consortium then secured lease areas for further offshore wind development off Massachusetts in an auction in December 2018.