DailyDirt: Storing Lots Of Energy

from the urls-we-dig-up dept

The obvious challenge with renewable energy sources like solar and wind is: what do you do when the sun isn't shining or the wind isn't blowing? Solar and wind generators don't tend to produce electricity in convenient amounts whenever we want, leading to wasted resources and further reliance on fossil fuel generators to keep up with electricity demand cycles. Storing lots of energy in an efficient way that can be readily recovered isn't easy, but there are some solutions that could work.

• It sounds like a made-up high school physics problem, but there's a startup called ARES (Advanced Rail Energy Storage) that wants to store energy by pushing heavy trains up a hill. When the energy is needed, the trains would roll back down the hill and generate electricity doing so. The rail system takes up a bit of space, but its backers compare it to a hydroelectric dam -- but without the water and with less environmental impact. [url]
• The Llyn Peris reservoir has a hydroelectric generator with a peak output of 1.728 GW (great, Scott!). This storage station supplements Britain's national grid, but it could power the city of Wales on its own for about 5.5 hours. [url]
• Storing energy in chemical batteries doesn't sound quite as simple, but batteries take up a lot less space. Big cheap batteries for grid storage could use molten metal salts, but the technology still needs a bit more work before scaling up. [url]

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Filed Under: advanced rail energy storage, ares, battery, energy, energy storage, generators, llyn peris reservoir, solar power

DailyDirt: Tiny Generators... Instead Of Tiny Batteries?

from the urls-we-dig-up dept

Battery technology just hasn't improved as much as other electronic gadgets. We have computers that are more powerful than room-sized mainframes on our wrists, but we still can't go more than a day without recharging a modern smartphone. We've seen suggestions of various kinds of portable fuel cells, but none seem ready for consumer gadgets just yet -- even several years after promising announcements. There are a bunch of ways of generating relatively small amounts of energy from everyday activities, so maybe we can generate electricity as we need it as we walk around. But probably not.

• Microbial fuel cells could be a convenient way to take personal portable energy everywhere you go, and a UK-based research group has one that runs on urine. Yup. The metabolism of live microorganisms can turn organic waste into electricity -- and urine has been demonstrated in a system that can recharge a smartphone. Another version of this system can be worn as socks (which would still require some way to get all the liquid to where it needs to go). The developers also say "smart toilets" could be a possible product. Uh, maybe in Japan? [url]
• If peeing into your socks doesn't sound like the fashion statement you want to make, you can also try harnessing the power of your footsteps with piezoelectric shoes. This tech needs to be a step up from the light-up kids shoes, and several folks are working on prototypes to get good-looking, adult-sized shoes that also generate a useful amount of electricity. [url]
• Capturing the energy from evaporation is possible, but scaling it up will take some work. An evaporation-powered toy car looks pretty cool, but making a generator many, many times larger to produce a practical amount of energy might be challenging -- especially since this method hasn't been rigorously tested outdoors (yet). [url]
• Fujifilm has a flexible thermoelectric material that can generate electricity from body heat. This energy-generating polymer could be added to solar cells to capture more energy, and optimistically, this stuff could be added to clothing. Maybe even your pee-soaked socks, someday.... [url]

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Filed Under: battery, energy, evaporation, fuel cells, generators, mfc, microbial fuel cell, piezoelectric, thermoelectric, wearables
Companies: fujifilm