I read another article on FB saying that they had to roster power during peak demand, so cut out entire area in order to service others without damaging the network. Apparently California had a big uptake on solar and wind. To fill in the remaining they used to buy power from nearby states. But with the drought and heat the other states were not in a position to supply any as they just had enough to fulfill their own demand. Another reason to not shelf too quickly "plan B" electricty generation.
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