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Primary Energy
Raw, unprocessed energy inputs into the energy system
ex: coal, wood, oil
Secondary Energy
Primary energy converted into a transportable form
Losses from transformation of raw resources into energy
ex: electricity from a power plant, charcoal from a charcoal kiln, gasoline from an oil refinery
Final Energy
Secondary energy delivered to the consumer
Losses from transmission & distribution (ex: electricity through an energy grid)
ex: electricity for the home, charcoal sold at the market, gasoline at a fuel pump
Useful energy
Energy put to the desired output of the application
Losses from inefficient applications
ex: light from a lightbulb, heat from burning charcoal, movement of a car
Efficiency
Reducing energy lost as waste
per unit input
Conservation
Reducing demand for energy
Cogeneration
converts waste heat emitted during electricity production into useful heat
Risk
probability of a hazard causing harm, accounting for likelihood of occurrence and vulnerability of subject
Risk = Probability of Hazard x Vulnerability
High capacity factor,
it operates at maximum capacity most of the time
Note 
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