In places with abundant wind and solar resources, like Texas and California, the price of electricity is dipping more and more frequently into negative territory. In other words, utilities that operate big fossil-fuel or nuclear plants, which are very costly to switch off and ramp up again, are running into problems when wind and solar farms are generating at their peaks. With too much energy supply to the grid, spot prices for power turn negative and utilities are forced to pay grid operators to take power off their hands.

Keep reading at MIT Technology Review.