Springs store mechanical or potential energy that can later be harvested into usable electrical power. One example is the electromagnetic induction generator (EMIG), which uses magnetic fields created by the motion of magnets on opposite sides of a coil to generate electricity. Another example is the torsion pendulum generator (TPG), which uses rotational motion from an oscillating pendulum attached to two torsion rods connected by two masses at each end. As one mass rotates, it twists the torsion rods and stores energy in the spring, which can then be converted into electrical power.

Overall, technical springs offer a unique way to store and release energy for various applications. With their high efficiency levels and potential for large-scale energy storage, they have the potential to become an increasingly popular choice for renewable energy projects in the future.