https://techcrunch.com/2019/02/04/vws-electrify-america-will-use-tesla-battery-packs-to-lower-charging-costs/

Electrify America, the entity set up by Volkswagen as part of its settlement with U.S. regulators over its diesel emissions cheating scandal, plans to install Tesla Powerpack battery systems at more than 100 of its electric vehicle charging stations this year.

Electrify America aims to use the Tesla Powerpacks to offset the cost of charging for customers. Owners of electric vehicles face high costs if they charge their vehicles during peak demand hours. The Tesla Powerpack battery systems store energy drawn from the grid during off-peak hours. That stored energy can then be used during peak demand hours when charging costs are higher. Each site will consist of a 210 kW battery system with roughly 350 kWh of capacity, according to Electrify America.