What is the cost of ownership of electrical storage systems, what benefits will be accrued, and how will they be distributed? (energy.ca.gov)
The thing is that we do not have, high energy density, long life, electrical storage devices. (judithcurry.com)
The common view is that a high fraction of renewable power generation would be costly, and would either often leave us in the dark or would require massive electrical storage. (scienceofdoom.com)