What does "Blackstart Capability" refer to?

"Blackstart Capability" specifically refers to the capacity of certain power plants to start independently without needing an external source of electricity. This capability is crucial during a blackout or a situation where the grid is down because it allows specific plants to generate power and provide the necessary energy to restart other plants and re-establish the grid.

When a large-scale power outage occurs, a blackstart-capable plant can initiate its systems and begin producing electricity without relying on the grid. This is essential for the overall reliability and stability of the electrical system. Once these plants can produce power, they can help to bring other power plants online and support the gradual restoration of the power supply across the network.

The other options do not accurately capture this essential feature of blackstart capability. Notably, while there are plants that can restart without an external power source, not all power plants possess this ability, which is why it's critical to highlight the specificity of certain plants with this capability.