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The bill is expected to require utilities to purchase power from offshore wind farms.Stephan Savoia/The Associated Press

Lawmakers in Massachusetts are drafting a bill that would jump-start the offshore wind industry in the U.S., helping trigger a $10 billion building spree off the Atlantic coast.

The energy bill may be introduced as early as this month and is expected to require utilities to purchase power from offshore wind farms, according to Representative Thomas Golden, one of the Democrats who control the state legislature.

Still to be determined is how much power utilities would be forced to buy under the bill and, crucially, whether the state's Republican governor – who has already opposed one offshore project – will sign it.

Developers want legislators to mandate the sale of 2,000 megawatts over a decade, enough to power roughly 1.6 million households. Building the infrastructure to deliver that capacity would cost about $10 billion, said Tom Harries, an analyst at Bloomberg New Energy Finance. It also would give developers their first chance to build the farms on a mass scale outside Europe and Asia, in a region where powerful ocean winds and high energy prices will provide a key proving ground.

"This bill would be the last piece of the puzzle to get the industry going," said Thomas Brostrom, general manager of North America for Dong Energy A/S, the world's largest offshore wind developer.

Three companies – Dong, Deepwater Wind LLC and Offshore MW LLC – have leases from the federal government to build in the waters south of Martha's Vineyard. Deepwater last year began constructing the nation's first offshore wind farm off Rhode Island. Dong, meanwhile, has opened an office in Boston anticipating the Massachusetts legislation, and is hunting for further sites along the East Coast.

Massachusetts state Senator Marc R. Pacheco said the prospect of Dong and other companies anchoring their U.S. operations in the state may trigger an economic boom.

"We have the opportunity to create an industry," Pacheco, a Democrat, said in an interview."We have the opportunity to create thousands of jobs and create a whole supply chain."

Globally, offshore wind energy has boomed over the last decade as developers installed turbines with more than 11,000 megawatts of capacity, primarily in the U.K. and Germany, according to Bloomberg New Energy Finance. They're forecast to install another 12,000 megawatts in those areas by 2019.

At the same time, U.S. projects have languished as cheap natural gas and plentiful land for ground-based wind and solar farms have elbowed offshore turbines to the bottom of the clean-energy agenda. While the cost of offshore wind energy is falling, it remains one of the most expensive sources of electricity, scaring off utilities as potential customers.

By allowing the facilities to be clustered near each other off the coast of Massachusetts, developers are hoping to lower costs so they can provide power at more competitive rates to existing generators.

"Without those contracts, those power purchase agreements with the utilities, none of the developers can finance their projects," said Erich Stephens, executive vice president executive vice president of Offshore MW.

Building new power sources is critical in New England. The region is scheduled to lose more than 8,000 megawatts in the next four years as oil, coal and nuclear power plants close. Massachusetts Governor Charlie Baker has pushed to replace closing plants with hydro electricity, introducing a bill last year that would require utilities to seek long-term contracts with hydro companies that could draw as many as 2,400 megawatts from Canada.

The governor has been less enthusiastic about offshore wind. During an unsuccessful gubernatorial run in 2010, he railed against Cape Wind, a now-stalled attempt to build a 468-megawatt project off Cape Cod. It was maligned as a would-be eyesore and criticized by Baker as a sweetheart deal for the developer.

The new crop of developers plan to build further out to sea, where the turbines wouldn't be visible from land. Baker, who declined to be interviewed, has indicated he may be receptive.

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