Interesting clean-energy concept called Gravity Batteries: use solar panels to generate electricity during the day. During off-peak times, excess energy is used to wind up the gravity batteries to the surface. When solar power diminishes and there is still demand for power, the gravity batteries slowly descend, spinning generators and producing electricity.
Solar energy is free and plentiful everywhere on the planet, the only problem is that it's only available half of the day, and for that part of the day, most people are usually away from home, at work or at school, thus, at times where solar panels produce the most energy, there's nobody around to use it. In order to put solar energy to good use, we need an efficient way of storing it, however batteries are expensive, toxic, have limited life spans, they drain over time... they are pretty much useless when it comes to storing large amounts of surplus energy for medium to long periods of time.
Meet the gravity battery! Using the principle of exploiting the force of gravity, it is in theory possible to store vast amounts of surplus energy, relatively cheap, environmentally friendly, maintenance free, totally safe and without disrupting landscape or taking up horizontal space. The concept of exploiting the force of gravity has been around for centuries in the form of the pendulum clock, which stores the energy that a person puts into the system and then distributes it slowly over a long period of time. The gravity battery acts in a similar way, it stores the surplus energy obtained from solar panels during long periods of time, and then delivers it whenever it is needed. It is literally the best possible way of storing large amounts of energy for an indefinite period of time.
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