One of the biggest challenges to the shift to renewable energy is that the supply is not consistent. The sun sets or the wind stops blowing and one is left without power. A number of researchers and companies are working on storage solutions. This article describes a storage system being developed by Tesla Motors.
Tesla Motors says it is making a foray into the challenge of how to use the sun’s energy when it isn’t shining, with a fleet of battery systems for homeowners, businesses and utilities.
Source: With New Factory, Tesla Ventures Into Solar Power Storage for Home and Business