Power Tank is a distributed system for charging electric vehicles. The project provides a network of on-demand charging modules that allows for the widespread adoption of electric vehicles without the need for a large-scale charging infrastructure. Power Tank users subscribe to a service that can deliver a charging module to them wherever they are, whenever they need it. When not in use, these charging modules are used as a reservoir of power to provide grid services in the company’s warehouse. Power Tank leapfrogs slow and expensive infrastructural development by providing a small scale, distributed service for providing alternative energy.