Katie Dykes, deputy energy commissioner in Connecticut, said "dozens" of proposals were submitted by the noon deadline on Thursday. She declined to identify a specific number of bids, and said they will be posted online in the next day or two.
Rhode Island, Connecticut and Massachusetts worked together with a goal of procuring long-term contracts for power from solar, hydro or wind power.
The proposal will help Connecticut meet renewable and climate goals and ease the impact of natural gas supply bottlenecks in the winter, Dykes said.
The three states are seeking the equivalent of 600 megawatts of power, said Patrick Woodcock, director of the governor's energy office in Maine.
One proposal by Central Maine Power and Emera Maine, the state's largest electric utilities, would expand the state's power transmission system to carry up to 550 megawatts of power. Transmission lines proposed in Vermont and New Hampshire also are expected to be included in the competitive bidding.
The projects would be funded by electric ratepayers in the three southern New England states that initiated the process.
The timeline calls for a selection of winning bids by late July. Then the proposals would be submitted for regulatory approval.