They also have unusual power consumption habits - they consume huge amounts of power once or twice a week, but then sit almost idle the rest of the time. These fluctuations are also yearly seasonal, because out of season the parks aren't used as much.
This means that a large solar array is best used to feed power back into the grid, making money which can be used to pay for the huge power bills from the peaks. The cells won't provide any power to the club at all - it will all be used by other consumers.::Engadget