From mountain-top wind turbines in Norway to rooftop solar panels in Australia, renewable energy is flooding into power networks like never before. Because the output from these new sources fluctuates with the changing winds and the movement of the sun, they often deliver more electricity than grids can absorb, leading to the curious phenomenon of “negative” power prices.
It means that electricity shouldn’t be treated as a good you can speculate on.
I didn’t see anything in the article at all regarding speculation or futures markets of electricity with the one exception being a mention of some industrial operators signing long term contracts to buy oversupply.
Can you refer me to the section of the article you’re responding to?