The Boston Globe looks at Cape Wind costs: 
Once the 130 turbines begin rotating, the energy produced will cost up to 50 percent more than energy today from some land-based wind farms and twice as much as some hydroelectric dams.
Now, after a new analysis by the attorney general’s office placed the cost of building Cape Wind at more than $2.5 billion, 2 1/2 times the original estimated price tag, the state Department of Public Utilities is weighing whether National Grid’s proposed 15-year contract with Cape Wind is a good deal for ratepapers. A decision is expected by mid-November.
