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In order for a power grid to operate in a stable and continuous manner, all of the generators must turn at the same RPM rate. The required precision is phenomenal; over the course of a year they must turn within .0000001% - they cannot even vary, over the course of the year, by 1/10th of a revolution in the total number of times they revolve.
Daejeon may launch the use of hybrid buses running on ``recharging roads'' as the city's public transportation in the near future.The Korea Advanced Institute of Science and Technology (KAIST) conducted a test drive of the On Line Electric Vehicle (OLEV) in the city Thursday for commercialization.OLEVs can run without having to be recharged, passing over certain tracks under which power coils are buried.The buses are provided electricity while running on the roads through a magnetic device attached to them. They are highly competitive in terms of price as their batteries are used only for emergencies, and are one-fifth the size of existing electric vehicles.