Alternately, if wind and solar can be made absurdly cheap, there are are less-energy-efficient but lower-cost per unit output forms of storage that can help. P

Alternately, if wind and solar can be made absurdly cheap, there are are less-energy-efficient but lower-cost per unit output forms of storage that can help. Pneumatic storage is promising for this for example. So like instead of one wind turbine and one battery, you build two wind turbines and one pneumatic energy storage vessel and get the same amount out.