HydroCharge is a watermill attached to a generator, this converts the energy from rainwater into usable electricity that can be used in the building. The energy can also be stored in a battery within the building for later use.
The watermill is discreetly build in the rainwater drainage pipe, and the motor is placed in a slick casing alongside the pipe. This ensures that HydroCharge has minimal impact on the aesthetics of the building. A small tank is also placed on roof a the building to collect the rainwater, this can open close via a valve to ensure a constant flow rate. Multiple generators can be stacked in a drainage pipe to produce more energy.