Toaru Majutsu no Index Wiki
WindFarm WindTurbines-RailgunSED

Wind turbines in an open field, being viewed from afar by Misaka Imouto and Misaka Mikoto in the Toaru Kagaku no Railgun S first ending theme.

A Wind Turbine (風力原動機 Fūryoku Gendōki?) 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,[1] specifically, the Three-Bladed Propeller (三枚プロペラ San-mai Puropera?), inside Academy City, near roads, paths, or even with school grounds, and is one of the most iconic features of the city.


Toaru Majutsu no Index E14 10m 02s

Sisters forcing the turbines to move through the use of their powers on a windless night.

The power generator of the wind turbine is actually a motor. The central coil, that spins when electricity is used, creates electricity upon being spun manually. Moreover, the motors will rotate when supplied with specific electromagnetic waves.[2]

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.[3] The city has more than 10,000 wind turbines across the city,[4] which replace electric cables and power lines that are present in a regular city.[5]

Despite having other sources of electricity such as 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.[6]

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 district has its own Central Hub Transformer Station.[7]

The triple-bladed propellers are made of carbon fiber materials, with metal components in the tower. A propeller blade weighs about 500kg.[8]

School District 22[]

Toaru Majutsu no Index III E07 13m 01s

Wind turbines in 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 a 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.[9]

Toaru Majutsu no Index III E07 13m 07s

The stacked wind turbine variant

Most of the energy is used 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.[9]



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Academy City
Inhabitants Faculty and Staff Students
Factions and Organizations Board of Directors (Board Chairman) • JudgmentAnti-SkillCooperative InstitutionsUseful SpiderSkill-Out
Locations School Districts School District 1 (Administration) • School District 2 (Military & Law Enforcement Training) • School District 3 (Outsider Accommodation) • School District 4 (Food) • School District 5 (Universities and junior colleges) • School District 6 (Recreation) • School District 7 (Middle & High Schools, Student Accommodations, Hospitals) • School District 8 (Faculty Accommodation) • School District 9 (Industrial and fine arts) • School District 10 (Reformatory, Nuclear Research, Cemetery) • School District 11 (Goods transfer) • School District 12 (Theology) • School District 13 (Kindergarten and primary schools) • School District 14 (Overseas Students) • School District 15 (Shopping & Mass Communication) • School District 16 (Commerce) • School District 17 (Industry) • School District 18School District 19School District 20 (Sports and athletics) • School District 21 (Water storage & Observatory) • School District 22 (Underground development) • School District 23 (Aerospace)
Other Notable Locations School District 7: Windowless BuildingHeaven Canceller's HospitalA Certain High SchoolKamijou ResidenceSchool Garden (Tokiwadai Middle School)
Other: Imaginary Number DistrictReformatoryExternal Connection Terminals
Power Curriculum Program Esper (Level 0Level 1Level 2Level 3Level 4Level 5Level 6 (SYSTEM)) • Personal RealityEsper AbilitiesAIMSystem ScanLevel 6 ExperimentsParameter List
Notable Technology Tree DiagramHikoboshi IIBankAirshipCleaning RobotSecurity RobotWind TurbinePowered SuitNanodeviceSupersonic Passenger PlaneHard Science
Events (Timeline) Regular DaihaseisaiIndependence DayIchihanaransaiSummer City Flood Prevention ProgramAnti-Crime Orientation
Other 0930 IncidentInterceptor ShowAvignon Cleanup OperationWorld War IIIDecember Heatwave48 Hours to Restore OrderEvacuation of Academy CityOperation Handcuffs
Other ScienceExperiments and ProjectsChild ErrorMagic-Science TreatyAcademy City Military
See also: Dark Side of Academy City