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What are all the different ways to store energy besides using rechargeable batteries?
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Human beings have been looking for a good way to store energy for a long time. One of the major things that has been holding up electric cars is battery technology -- when you compare batteries to gasoline, the differences are huge. For example, a typical electric car might carry 1,000 pounds (454 kg) of lead-acid batteries. Those batteries take several hours to recharge, and might give the car a 100-mile (160-km) range. Two or 3 gallons of gasoline give the same range, weigh less than 30 pounds (13 kg), and you can pump that much gasoline in about a minute.

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­ Here is a list of other technologies that people commonly use to store energy. Some of these work in an electric car, while others are better for stationary applications:
  1. One of the oldest techniques people have used is the falling weight. You lift the weight to store the energy in it and then let the weight fall to extract the energy. Many grandfather clocks and cuckoo clocks use this technique. By running the string attached to the weights through a gear train, you can use a heavy weight and let it fall over a long period of time. This approach doesn't work very well in an electric car, but it has worked well in clocks for hundreds of years.
  2. Many power plants use the "falling weight" approach in the form of water. The water is pumped uphill to a lake at night when the power plant has excess capacity. During high-demand daytime periods, the water runs through a turbine on its way downhill to a lower lake.
  3. Another way to store energy is in some form of repeatable mechanical deformation. This is the idea behind a spring used in a wind-up clock or a rubber band used in a wind-up airplane. You store the energy by bending (deforming) the material in a spring, and the material releases the energy as it returns to its original shape. At the scale of a car, this technology has problems because of the weight of the spring, but at smaller scales (like a wristwatch) it works great.
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  5. Nature has been storing energy for a long time, and if you want to think about it in this way, gasoline is really a form of stored energy. Plants absorb sunlight and turn it into carbohydrates Over millions of years, these carbohydrates can turn into oil or coal. On a more human time scale, we burn wood (which is a carbohydrate) to release stored energy, or turn corn into alcohol and burn the alcohol.
  6. Another technique that nature uses to store energy is fat, which many of us are familiar with in a personal way. It is interesting to think about a car that somehow eats grass or some other carbohydrate and stores it as fat!
  7. You can take energy and split water into its hydrogen and oxygen atoms using electrolysis. By storing the hydrogen and oxygen in tanks, you can later create energy by burning it, or (more efficiently) by running it through a fuel cell.
  8. You can use the energy to spin up a flywheel and then later extract the energy by using the flywheel to run a generator. This patent has lots of information.
  9. You can store heat directly and later convert the heat to another form of energy like electricity. This page discusses some of NASA's experiments in this area.
  10. You can use compressed air to store energy. Toys like the Air Hog store energy in this way. Compressing gases like nitrogen enough produces liquid nitrogen, and this page talks about how you can use liquid nitrogen to power a car.
  11. One of the new technologies that may become available in the future involves antimatter. When you combine normal matter with antimatter, you get energy. You store the energy by creating the antimatter. This page talks about it a bit.
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Right now, none of these techniques can hold a candle (another form of stored energy!) to gasoline in the convenience sense. Fuel cells using methanol look to be the closest competitor right now, and will probably become available to the general public over the next few years.

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