The price of energy sometimes goes negative, even, because wind farms want to recoup the renewable energy credit. Craziness!

Aquion is definitely an exciting competitor, and we wish them all the best. It is an honor to have such a worthy competitor. I think we'll bring out the best in each other.

They probably can reach the smallest scales better than we can, though I think we're going to give them a run for their money at mid - larger scales. It will be a challenge to come up with a system nearly so low cost and long lasting as one using compressed air. There are also some very interesting things we can do with low-grade heat, but that is another story. :-)

In my area it will sometimes drop to zero or negative on early summer mornings during heat waves. The peaker plants are still spun up and they need the load to burn off the excess energy.

Granted, even a little negative doesn't mean you'll make money by turning on all the lights and cranking the A/C. Distribution charges and etc usually add a few cents per kWh.