The system in New Zealand—you can't store electrons in the electricity system. You can store fuel in the form of hydro or in the form of coal, and there is a complex system of rules that require every part of the system to be playing its part, from the people who generate the electricity to the Transpower grid that transports large quantities of electricity through to the local distribution lines. All of that is controlled by the system operator, which is Transpower, and Transpower has the job of forecasting future power needs and matching the demand for power with the generators who provide the power that's transmitted to consumers. Now, they look out a few days. About 72 hours ahead of demand, they get serious about starting to try and predict future demand, and then, as they get closer and closer, they get more confident in their projections of future demand. They have got rules that they operate in as to whether they think that the prospective bids that they have from generators who say they're willing to sell electricity into the system will match up with the anticipated demand.