Massachusetts, Rhode Island and Connecticut received proposals Wednesday for offshore wind projects as the three East Coast states hope to boost their reliance on the renewable energy source. The three states joined in a historic agreement that allows for potential coordinated selection of offshore wind projects. Massachusetts received bids from Avangrid Renewables, South Coast Wind Energy and Vineyard Offshore in response to the region’s largest solicitation to date for offshore wind, seeking up to 3,600 megawatts.