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The key is a modular design, which could make the technology practical as a way to keep the grid stable and reduce electricity costs.
A spinoff from the Rocky Mountain Institute has developed a 100-miles-per-gallon plug-in hybrid.
A battery will capture power from braking trains.
Just as the company makes engines, it will now make battery packs for electric cars.
The new Mini borrows a drive system from a high-performance electric sports car.
Researchers show a low-cost route to making materials for advanced batteries in electric cars and hybrids.