The Internet of Things is expected to incorporate billions of devices in the future. That’s a lot—far too many to all run on battery energy alone. For this reason, the harvesting of energy, or deriving energy from external sources, is growing in importance and being done with more ingenuity every day.

Research firm IDTechEx expects the annual global sales of energy harvesting products, which is currently at $300 million, to reach $2.6 billion by 2024. Heat generated from the human body, leg movement, and finger tapping are just a few ways mobile devices are beginning to harness kinetic energy. Experts predict that walking and running could one day be used to power buildings—a sign of what’s to come for Smart Cities across the globe.

A look at the importance of harvesting energy to power the Internet of Things, from gadgets to smart cities.

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