What is the primary difference between 'spinning reserve' and 'non-spinning reserve' in frequency control?
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A
Spinning reserve is on synchronous units already online; non-spinning reserve requires unit startup
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B
Spinning reserve responds in 30 minutes; non-spinning reserve responds in 10 minutes
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C
Spinning reserve is used only for over-frequency events; non-spinning for under-frequency
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D
Spinning reserve is thermal generation only; non-spinning includes hydro and wind