Magnetic Generators that will produce electricty from ambient energy. Both rotary and solid-state. MagGen will eventually power homes as well as provide on-board recharge for electric vehicles.
Ultraconductors. Polymer equivalents of a room temperature superconductor. When wire is developed these materials are expected to compete with copper on a per/ampere cost basis early on.
Heat generating systems: Low Energy Nuclear Reactions. Also, other unconventional heat generation systems.