Motion into Electricity
Modern cities are full of constant motion. Millions of footsteps move through urban infrastructure every day, vehicles generate turbulence on highways, buildings experience continuous vibrations from human activity, and things just never stop. Most of this movement simply dissipates as unused mechanical energy. However, advances in energy harvesting technology are making it possible to convert this everyday motion into usable, green electricity.
Energy harvesting refers to the process of capturing ambient mechanical energy, such as motion, vibration, or pressure, and converting it into electrical power. This approach is becoming increasingly important in the context of smart cities, decentralized energy systems, and sustainable infrastructure, where energy can be generated closer to where it is consumed rather than relying entirely on large centralized power plants.
Two technologies often discussed in this field are piezoelectric energy harvesting and kinetic energy harvesting. While both aim to convert mechanical energy into electricity, they rely on different physical principles and are suited to different scales of application. In the following sections, we explore how these technologies work, their key differences, and where each approach is most effective in capturing the untapped energy present in everyday movement.
How to turn Motion into Electricity
Kinetic energy generation is the process of converting the energy of motion, moving objects, or particles into usable power. For using the (currently wasted) power of human footsteps, two approaches can be employed: electro-mechanical and piezoelectric.
Electromechanical energy generation converts mechanical movement into electricity using the principle of electromagnetic induction. It is the foundation of Holm Energy’s Smart Energy Tiles technology. When physical motion, such as footsteps, are applied to a mechanical system, internal components compress and drive a generator that produces green power. This type of kinetic energy harvesting is particularly effective in environments where there is frequent and repeatable motion, such as metro stations, airports, shopping malls, and other urban infrastructure. Because it uses mechanical systems designed to capture larger movements, electromechanical harvesting can generate a measurable amount of green electricity that can either power nearby systems directly or be stored for later use.
Piezoelectric energy harvesting relies on the piezoelectric effect, where certain materials, such as specialized ceramics or quartz crystals, produce an electrical charge when subjected to
mechanical stress, pressure, or vibration. When these materials are compressed or deformed, the internal structure of the material generates a small electrical voltage that can be captured and used as power. Because the technology does not rely on large moving mechanical parts, piezoelectric generators are typically compact and well suited for micro-energy harvesting applications, such as powering sensors, small electronics, and low-energy devices.
Piezoelectric systems are commonly used in environments where vibrations or small mechanical forces are present, including wearable devices, industrial monitoring systems, and certain sensor networks.
Comparing the Two
The technology that’s better for you depends on the context in which you aim to use it, as they are designed for different scales and applications.
Electromechanical or kinetic energy harvesting, uses mechanical movement to drive generators that can produce a larger amount of electricity, making it more suitable for infrastructure-scale applications like energy harvesting floors, roads, or transportation hubs. On the other hand, piezoelectric energy harvesting produces small amounts of power and is best suited for low-energy applications such as sensors, wearables, and monitoring systems. In environments where there is continuous human or vehicle movement, electromechanical systems capture more usable energy.
Another key difference lies in how the technologies handle motion and force. Piezoelectric systems rely on material deformation to generate electricity, meaning the energy output depends on the stress applied to the material. Electromechanical systems capture motion through mechanical components which results in higher power output. Because of this, many smart city and urban energy harvesting solutions favor electromechanical systems for applications where significant mechanical movement is available, while piezoelectric systems remain valuable for small-scale, distributed energy harvesting applications.
Motion-Powered Infrastructure and the Role of Holm Energy
At Holm Energy, we believe the movement that already exists within cities represents a largely untapped opportunity for decentralized renewable energy generation. Our Smart Energy Tiles are designed to convert the kinetic energy of footsteps into usable electricity in
high-footfall areas such as metro stations, airports, and other private and public infrastructure. These tiles transform passive surfaces into active energy-generating systems, and are also equipped with IOT sensors to provide valuable data points about public engagement, footfall, activity etc, helping infrastructure turn net-zero. Beyond the electricity generated, the technology also creates a powerful connection between people and the energy they consume, demonstrating how everyday human activity can contribute to a more sustainable, distributed energy future, through increased individual accountability towards sustainability. By embedding energy harvesting technology directly into urban
infrastructure, we aim to help cities move toward cleaner, greener energy while encouraging greater collective responsibility for sustainability.
That’s it!
As cities grow and energy demand continues to rise, technologies that can capture ambient mechanical energy from everyday motion will play an increasingly important role in the future of decentralized and sustainable power systems. Both kinetic energy harvesting and piezoelectric energy harvesting represent innovative approaches to converting movement into electricity. However, when it comes to high-footfall areas and public spaces, where energy generation is key, electro-mechanical systems are the clear choice.
Together, these technologies highlight an important shift in how we think about energy, not just as something generated in distant power plants, but as something that can be produced continuously within the spaces where people live, work, and move.
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