Recent reductions in the cost of offshore wind energy in Europe have led to renewed interest in deploying this technology in the US. This is particularly true in the Northeast US (New York and New England). That said a wider acceptance of this technology may bring with it intermittency issues that grid planners are not currently anticipating. In essence while offshore wind power might mean a feast of clean energy it may also be a famine during certain critical periods. In this Insight Wood Mackenzie summarizes the drivers of growing interest in offshore wind in North America specifically the Northeast US. After that we examine actual Northeast offshore wind speeds over the past couple of years. Coupled with information from the first operating offshore wind farm the data suggests that real world offshore wind power performance and reliability may fall short of today s assumptions used by Northeast grid operators.