At the flick of a switch

Electricity is a commodity that is extremely difficult to store. This means that even small temporary shocks in demand or supply can result in very abrupt short-term changes in prices, the so-called spikes. It is well-known, andwell-documented, that upward price spikes occur in electricity prices, but in some markets downward spikes can actually also occur. As an example of this, consider Figure 1, which shows a time series of the logarithm of the daily spot electricity price, for 2004, on the N

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