The Biden-Harris administration today announced its approval of the Coastal Virginia Offshore Wind (CVOW) commercial project – the fifth approval of a commercial-scale, offshore wind energy project under President Biden’s leadership.
It's a big area you can set up wind farms in, while property ownership in the eastern US is typically in the form of lots of small parcels, making it difficult to accumulate enough contiguous land for a large wind farm
Also the turbines can be much larger. The blades have to be a single piece, to withstand the forces on it. That obviously causes problems transporting them on land. Modern offshore wind turbine blades are single pieces of over 100m, so longer then a football pitch. However that is not a problem offshore. The reason you want it is that with blade length the energy produced grows exponentially.
The project plans for 5GW power. In comparison, The UK alone currently operates 6GW, with another 3GW under construction (finished by 2026), another 7GW planned for 2026 and another 10GW planned without a specified time line. Population in the UK is roundabout 66million. US 330 Million.