According to the Fairbanks Daily News-Miner, The Kassel family, Karl, Billie and their fifteen-year-old son live in a house at the top of Murphy Dome built to harness and conserve energy to such a degree that they've only had to actively burn fuel to power every now and then. A combination of technologies have enabled the Kassels to use only two cords of wood, 170 gallons of propane, and 20 to 30 gallons of diesel fuel to maintain their home throughout the last year, even as temperatures plunged. Read much more about the design and ways they're already considering refining it, here.