The answer to this is just "intermittent" : the higher the share of renewables, the higher the share that you have to make up for when you're at night without w

The answer to this is just "intermittent" : the higher the share of renewables, the higher the share that you have to make up for when you're at night without wind. This can be done through batteries, water storage, or interconnection, but that's the real cost of renewables.