A wind or solar fleet is reported in gigawatts installed and consumed in megawatt-hours delivered, and the ratio between them - the capacity factor - moves with weather, congestion and maintenance rather than with policy. A buyer contracting for clean energy is buying the second number and reading headlines about the first.
The gap widens as penetration rises. Once a corridor is saturated, additional generation is curtailed rather than delivered, which means the marginal project adds nameplate and no energy at all until transmission catches up with it. That is a grid fact expressed as a renewables statistic.