Any source can be disconnected from the bulk electric system. If there is too much power and a generator is told to disconnect it is called a curtailment. Some

Any source can be disconnected from the bulk electric system. If there is too much power and a generator is told to disconnect it is called a curtailment. Some contracts allow the generator to get paid for the power they could have produced but weren’t allowed to deliver due to too much supply / not enough load, so it isn’t really a good thing as the ratepayers still end up paying for the power not generated. Dispatchable generally means you can tell the source when to generate as opposed to when not to.