According to data from the Global Wind Energy Council (GWEC), the accumulated global wind energy capacity reached 1,299 GW by the end of 2025. The global market experienced a historic acceleration during that last year, driven mainly by China, the United States, India, Germany, Brazil, and Spain, six powers that concentrate nearly 75% of all operational wind installations on the planet.
However, energy generation for domestic consumption is no longer limited to solar panels on the roof or small photovoltaic installations in gardens. The wind, a renewable and free resource that flows through our avenues and towns daily with variable intensities, can be converted into electric current. This is what is called wind microgeneration; a trend in which Spain also seeks to stand out within the regulatory framework designed by the Institute for the Diversification and Saving of Energy (IDAE).
What are mini-wind electric plants?
These are electrical installations that use small-sized, low-power wind turbines. By law, to be called mini-wind, their power must be less than 100 kilowatts (kW), although the most common home models usually have between 1 and 5 kW.
Unlike the wind farm wind turbines, this equipment is lightweight, compact, and measures from one to five meters, which allows them to be safely placed on the roof of a single-family home, a community of neighbors, or on the roof of an industrial building. The most common equipment ranges between 1.5 kW and 3 kW and is an optimal solution for locations and spaces far from the electrical current network.
These small mills produce zero-mile electricity, at no cost to the consumer, which promotes their energy autonomy. One of their advantages is that they perfectly complement solar panels. If solar energy reaches its peak production around solar noon, the wind usually blows stronger at night, during cloudy days, or storms. Therefore, combining both technologies with hybrid self-consumption in the same space provides a stable and continuous flow of energy for domestic use.
How do they work in a house or small business?
The operation is simple: the wind pushes the blades of the device, they start to turn and activate an internal generator that conducts the electricity to the grid.
To overcome the air direction changes when it collides with the urban fabric, there are two types of adapted design. The first consists of a horizontal axis which is the most common in the form of propeller or classic mill, and the one that best adapts to open spaces and farms.
The second model pivots on a vertical axis, similar in design to a kitchen mixer. It is omnidirectional and, therefore, the one that best suits a small wind power installation in the city because it needs to turn in search of the wind and capture the gusts and whirlwinds that form from the rebound between facades and buildings.
A study published in ScienceDirect about small wind turbines and their multiple applications within developments in IoT (Internet of Things) concluded that these small urban turbines work better if installed right at the edges of rooftops, since building facades act as ramps that accelerate the speed of the natural breeze.
Silent and integrated turbines
An example of the speed at which these projects start to take off is the European SWIP project, coordinated by the Center on Energy Resources and Consumption Research (CIRCE) of Zaragoza University. With an investment of nearly five million euros, the researchers managed to design fully silent turbines prepared to be integrated into the roofs of the homes.
In the Spanish market, there are already commercial solutions such as the Rosbi device from the company Roseo Eólica Urbana. This device is designed to be placed on the cornices of apartment blocks, taking advantage of the air rising along the building's wall to generate light without transmitting any vibration or noise to the homes.
In June, the Ministry for the Ecological Transition of the Government of Spain, together with IDAE (Institute for the Diversification and Saving of Energy), published the requirements for the creation of the small wind turbine label to begin addressing the needs of demand in this segment emerging among renewables.
Ultimately, mini-wind energy and all the potential that its small-scale use as an energy resource opens up reinforce that wind is a renewable resource gaining relevance as an ally to optimize domestic energy consumption. By installing a small wind turbine at home, the role shifts from energy consumer to co-generator of savings and sustainability.
