By David Biello | March 5, 2010 "One idea is to create enclosed, small "modular reactors," like the one developed at Los Alamos National Laboratory and now proffered by Santa Fe, N.M.’s Hyperion Power. Its $50-million product would be an enclosed reactor roughly 1.5 meters wide by 2.5 meters tall; generating 25 megawatts, it would be buried underground and good for at least seven years. In fact, the promotional materials, on display at a booth at the inaugural ARPA-E conference, show nothing but a green field with a single tree. Think large (hidden) battery, the company urges."