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Electrical Power System
The EPS consists of three subsystems: power reactant storage and distribution, fuel cell power plants, and electrical power distribution and control.
Power Reactant Storage and Distribution
Cryogenic hydrogen and oxygen are stored in specially-equipped tanks.
Fuel Cell Power Plants
The fuel cells are located under the payload bay area and in the forward portion of the orbiter's midfuselage.
Electrical Power Distribution and Control
The EPDC subsystem distributes 28-volt dc electrical power and generates and distributes 115-volt, three-phase, 400-hertz ac electrical power to all of the space shuttle systems' electrical equipment throughout all mission phases.

Curator: Kim Dismukes | Responsible NASA Official: John Ira Petty | Updated: 04/07/2002
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