Actually one for the next AWS user group meeting...
Ken Boak mentioned that it is possible to measure the load on the national grid by the frequency going through an electric cable. According to him it varies within a range and if it tends towards the lower bound, the grid is being overloaded. In such cases, diesel generators, which are expensive to run, keep the supply, avoiding blackouts (my conclusion).
I conclude that this is not a true commodity market, as if the electricity is more expensive to produce, then it should cost more, and vice-versa. There are groups, according to Ken, lobbying or at least trying to raise awareness towards this fact, to allow for policies whereby it would be cheaper to run home appliances when there was less load on the grid, for instance, running time-programmed washes, etc.
This is happening now on AWS. The cost of running EC2 spot instances varies by the hour, so perhaps this is a truly commoditised market after all.
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