Infrastructure to physically carry the energy away from the power station, aggregate it with other stations’ energy, and transmit it safely to the customers who can use it.
To tie in a major new source of energy, you need to make sure the wires and stuff can handle it, which involves physical construction and planning at a level above an individual operator. The US regulator estimates that 2,500GW of clean energy projects, like this one, are already built and stuck in the backlog of interconnection requests.
What is "transmission capacity"?