Today it's so windy near Edinburgh that the price of power has gone negative! So we're helping out the electric company by turning on more lights.
Why does the price go negative? Apparently because it costs more to slow the turbines than to let them spin and generate power. And it costs more to dump the power somewhere than to have customers use it.
We get the pricing data in real time from here:
And solves it usefully, not just wasting heat from lights.
@johncarlosbaez