While state-of-the-art CCGTs are capable of start and stop operations, most of the installed capacity has not been designed to be operated in such an intermittent mode. In addition, existing market design does not necessarily provide an adequate remuneration of these start-up and cycling costs. Whereas demand uncertainty on a day-ahead time-scale is typically in the range of 1-2% of load, the mean absolute error for wind is 15%, 24 hours before real time. Commercial providers of forecasting solutions claim that they can reach a forecast error to 5%, 24 hours before real time.14 Centralisation of information concerning weather forecasts and improvements of forecasting models will reduce this uncertainty.