Insulation is still the cheapest way to save energy in your home, but once you've gone as far you're willing to insulate, solar hot water, photovoltaic panels, and perhaps even hydrogen are potential alternatives.
Inside the Solar-Hydrogen House: No More Power Bills--Ever: Scientific American: "'The ability to make your own fuel is priceless,' says the man known as 'Mr. Gadget' to his friends. He boasts a collection of hydrogen-powered and electric vehicles, including a hydrogen-run lawn mower and car (the Sable, which he redesigned and named the 'Genesis') as well as an electric racing boat, and even an electric motorcycle. 'All the technology is off-the-shelf. All I'm doing is putting them together.'
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The Strizki's personalized home-energy system consists of 56 solar panels on his garage roof, and housed inside is a small electrolyzer (a device, about the size of a washing machine, that uses electricity to break down water into its component hydrogen and oxygen). There are 100 batteries for nighttime power needs along the garage's inside wall; just outside are ten propane tanks (leftovers from the 1970s that are capable of storing 19,000 cubic feet, or 538 cubic meters, of hydrogen) as well as a Plug Power fuel cell stack (an electrochemical device that mixes hydrogen and oxygen to produce electricity and water) and a hydrogen refueling kit for the car.
On a typical summer day, the solar panels drink in and convert sunlight to about 90 kilowatt-hours of electricity, according to Strizki. He consumes about 10 kilowatt-hours daily to run the family's appliances, including a 50-inch plasma television, along with his three computers and stereo equipment, among other modern conveniences.
The remaining 80 kilowatt-hours recharge the batteries—which provide electricity for the house at night—and power the electrolyzer, which splits the molecules of purified tap water into hydrogen and oxygen. The oxygen is vented and the hydrogen goes into the tanks where it is stored for use in the cold, dark winter months. From November to March or so Strizki runs the stored hydrogen through the fuel cell stacks outside his garage or in his car to power his entire house—and the only waste product is water, which can be pumped right back into the system.
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vented hydrogen speeds at 45 miles (72 kilometers) per hour through the atmosphere on its way off the planet—one of only two gases, the other being helium, that escapes into space entirely because it is lighter than air. In fact, Strizki's quarter-inch thick propane tanks weigh less when filled with hydrogen than when depleted.
Of course, hydrogen is a highly flammable gas, but its quick escape eases Strizki's fears that it might ignite or explode. It "disperses faster than any other gas," he notes. "Hydrogen won't sit around waiting for a flame."
The final piece of Strizki's energy solution is dubbed "Genesis," his $3-million aluminum Mercury Sable, one of 10 that carmaker Ford produced in the 1990s to test how well the lighter metal would fare in crash tests. Ford gave Strizki the special model to drive in the Tour de Sol solar car race in New Jersey in 2000. Strizki installed a 104-horsepower electric engine (compared with a Toyota Prius's 44-horsepower motor) that can reach speeds of 140 miles (225 kilometers) per hour. Pop the hood and next to the electric engine sit two fuel cell stacks that convert hydrogen and oxygen into water and electricity, propelling the electric engine forward smoothly and quickly.
The car never competed because it was not ready in time, but the unique vehicle does hold the world record for farthest travel on a single charge: 401.5 miles (646.2 kilometers), a distance which Strizki drove in December 2001."
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