Micro power systems cross the gamut from small hand held electronic devices to larger system to power a house or office building. The key is creating a system without a single point of failure. Imagine a power grid with minimal wires to distribute, power is captured and used at the point of service.
The miniaturization of power sources will drive the efficiency and utility of electronics.
A micro power system can eliminate a strategic weakness (distribution systems, central power stations), creating a strategic resource that limits natural disaster, terrorism, and ability to shut down a specific service. The user would also be able to go further with less infrastructure to contain them.