Places with intermittent water have lots of water storage in reservoirs. The problem is that reservoirs are up in the hills away from the coast so it would cost

Places with intermittent water have lots of water storage in reservoirs. The problem is that reservoirs are up in the hills away from the coast so it would cost a lot to pump it up. But running the desalination when energy is cheap makes a lot of sense. Especially when not providing all the water but topping up when supply is low. The only problem is the capital costs of desalination plant that isn't used all the time.