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Major U.S. proposals include a project in Texas state waters, off Galveston, which could see faster permitting because it doesn't need to go through federal review. But most are concentrated above Maryland in the East Coast's northern half, including Bluewater projects in Delaware and New Jersey.
Each state in the Northeast requires utilities to get a rising percentage of power from renewables over the next several years, such as the 15 percent requirement in Massachusetts by 2020. Many are relying on offshore wind to help them do it.
Today's turbines can't be built beyond 50 meters depth, which is no problem at various East and Gulf Coast sites, though it shuts out the West Coast and its steeply descending sea floors.
The Northeast's heavy coastal population also makes offshore wind a good option because costs increase the further electricity travels over transmission lines.
Last year, the federal government released new rules for permitting offshore projects. They're intended to help companies avoid the twisting route Cape Wind has taken. But officials estimate it will still take 7 1/2 years to get a federal permit. Developers face a web of local considerations along the way, too, including maritime traffic and ecological effects.
"The path is too long," Mandelstam says.
The high upfront costs of building and maintaining massive turbines at sea help make it significantly more expensive than onshore wind. For instance, the Department of Energy says building an offshore plant where wind power density ranges between 400 and 500 watts per square meter costs about $120 per megawatt hour, compared to about $80 for a land-based wind plant.
Cape Wind officials won't disclose the project's price, but Kopits estimates it's at least $2 billion.
Offshore developers need substantial subsidies, such as tax and production credits, and developers in Europe benefit from far more government help.
The expense puts the power at a premium that not everyone is willing to pay. This month, Rhode Island regulators rejected a deal between a local utility and developer Deepwater Wind, citing a high price per kilowatt hour. Only one other project, Bluewater's project in Delaware, has a power purchase deal, considered crucial to investors.
With natural gas prices dropping considerably from five years ago, offshore wind prices look even more pricey by comparison.
Advocates say focusing on today's prices is shortsighted, arguing that free offshore wind is a good long-term bet compared to fossil fuels, with their unstable and inevitably increasing prices.
"Costs will go down," says Walt Musial, an engineer at the National Renewable Energy Laboratory. "We may have some slow starts ... and we may have some pushback, but eventually I think we're going to see offshore wind grow."
[Associated
Press;
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