Exactly, they can't remove base load power plants because they need them for times when solar and wind output are low, and 'peaker plants' are incredibly expens

Exactly, they can't remove base load power plants because they need them for times when solar and wind output are low, and 'peaker plants' are incredibly expensive. (which are activated in minutes, instead of hours/days) By adding battery (like the 100MW project in Australia) they can remove a few older base load plants, and handle spikes with batteries, instead of peaker plants.