Wind Turbine

A Wind turbine (風力原動機) is a device that converts kinetic energy from the wind, into mechanical energy, in order to produce energy.

Numerous wind turbines are used to generate electricity, specifically, the Three-bladed propeller (三枚プロペラ), inside Academy City, near roads, paths, or even with school grounds, and is one of the most iconic features of the city.

Principles
The power generator of the wind turbine is actually a motor. The central coil that spins when electricity was used would create electricity upon being spun manually. Moreover, the motors would rotate when supplied with specific electromagnetic waves.

Usage in Academy City
The wind turbines are part of the city's experiments, like the Cleaning robot, but function well enough to be practical for the city. The city has more than 10,000 wind turbines across the city, which replace electric cables and power lines that are present in a regular city.

Despite having other sources of electricity such nuclear power plants or School District 21's dams, the wind turbines are the city's main source of electricity, the other being solar energy. Because the turbines are set up all across the city, it had the advantage of making it more difficult for a power outage to occur if some of them were destroyed in an accident or a disaster, adding complexity because the network of power supplies spread all across the city, making it a necessity for facilities to control the flow of electricity. As such, each destrict has its own Central Hub Transformer Station.

School District 22
The entire surface of School District 22 is a wind farm. There are no buildings and as such, wind turbines cover the district. One interesting note about the district is it also uses a different type of wind turbine. Here, the wind turbines are piled up or arranged on top of one another which resemble 30 story tall jungle gym. The reason being is that the underground complexes that extended downwards require a lot of electrical energy, and that the district cannot rely on regular wind-generated electricity or solar-generated electricity.

Most of the energy is uses to pump air in, absorbing oxygen in from the surface, removing the carbon dioxide accumulate below. Moreover, there is also a need to pump rainwater and wastewater up. With all those in consideration, 40% of the electricity consumed in Academy City is put into use for the large air pumps.