There are a couple of cases for offshore wind in the US:

- To supply power to densely populated coastal urban areas, where there isn't a lot of free land for onshore farms nearby.

- To provide some after-dark generation in areas where daytime solar power already surpasses the limits of demand.

The second case gets weaker if there is room for onshore wind power in the same region, or if storage prices keep falling so that solar electricity can be used after dark. The second case gets a little stronger if a region's highest seasonal electricity demand occurs in winter instead of summer.