Demand for storage varies greatly depending on overproduction, geography, and willingness to continue using fossil fuels. Plans for an 80% renewable grid in the he US are estimated at 12 hours of storage and "just" 3 weeks of storage. https://pv-magazine-usa.com/2018/03/01/12-hours-energy-stora...
The problem is, even 12 hours of storage is a prohibitively large amount. The US uses 12,000 GWh of electricity per day. 12 hours of storage is 6,000 GWh. The entire world produces 400 GWh of batteries each year. Most of it is going to EVs and electronics, not grid storage. Even if we stopped building EVs entirely and directed the world's supply of battery production to just America's grid storage needs were talking about a decade of production. And worse yet these batteries are good for a couple thousand cycles, and will have to be replaced after a few years of use. And even with this 6 terawatts of stotage, in the end we'll still have a fifth of our grid still dependent on fossil fuels.
Again, this is why plans for a renewable grid assume some other form of energy storage will be orders of magnitude better than lithium batteries. That'd be great if hydrogen, molten sand, compressed air, or something else delivers. But that's a big if on which to gamble the energy grid, especially when alternative paths to decarbonization that we have more than half a century operating are within our reach.
The problem is, even 12 hours of storage is a prohibitively large amount. The US uses 12,000 GWh of electricity per day. 12 hours of storage is 6,000 GWh. The entire world produces 400 GWh of batteries each year. Most of it is going to EVs and electronics, not grid storage. Even if we stopped building EVs entirely and directed the world's supply of battery production to just America's grid storage needs were talking about a decade of production. And worse yet these batteries are good for a couple thousand cycles, and will have to be replaced after a few years of use. And even with this 6 terawatts of stotage, in the end we'll still have a fifth of our grid still dependent on fossil fuels.
Again, this is why plans for a renewable grid assume some other form of energy storage will be orders of magnitude better than lithium batteries. That'd be great if hydrogen, molten sand, compressed air, or something else delivers. But that's a big if on which to gamble the energy grid, especially when alternative paths to decarbonization that we have more than half a century operating are within our reach.