Given the huge promise of terrestrial wind farms, it seems like someone is right now figuring out a way to either a) fabricate them on-site, or b) fly the parts in via drone or dirigible.
Building "on-site" is tough because the "sites" are by definition scattered around, often in the countrysite with little infrastructure. On one site you only have a handful of turbines to install.
Flying large objects is challenging. There have been attempts to transport large cargo with zeppelins, but it's more of a failure story of German industry politics [1].