In a large distribution grid, it is said that consumers and producers must be in balance; what that means physically, in correct (not simplistic) mathematical formulation, is not clear: perfect balance doesn't exist in nature and I'm fighting to understand how the out of balance system either stores and retrieves energy, and at what time scale the balancing done.
What are the short term energy flows?
When I turn on a light switch, power flows in the instant. Where is it taken from?
How much energy is present in the distribution network itself at any given time? Does it fluctuate?
Is there a good yet accessible description of the elasticity of the power system? Does it vibrate?
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