A persuasive coalition of labor and conservation groups has unveiled a bill focused on the development of “responsibly sited floating offshore wind” in federal waters off the coast of Maine, a proposal that would set high standards for procurement and seems to succeed in giving prominence to both environmental and economic goals.

The legislation would require the state’s Public Utilities Commission to buy enough electricity from wind power over the next 12 years to power 980,000 homes, more than in all of Maine.

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