Cost reduction of existing battery technology is all that's needed to make batteries widely useful for grid energy storage. No new chemistry needed, just econom

Cost reduction of existing battery technology is all that's needed to make batteries widely useful for grid energy storage. No new chemistry needed, just economies of scale. This is happening in CA [1] and elsewhere. The trend will enable renewable energy sources like wind and solar to meet larger portions of total electrical demand. That will cut into coal's power generation market share. Probably pretty rapidly. [1] https://www.nytimes.com/2017/01/30/business/energy-environment/battery-storage-tesla-california.html https://www.nytimes.com/2017/01/30/business/energy-environme...