4.1 Current status
There is a relatively short history of wind power forecasting among ISO/RTOs in the United States. CAISO was the first ISO/RTO to start using wind power forecasting for system operation when they introduced forecasting as part of their Participant Intermittent Resource Program (PIRP) in 2004 (Blatchford 2008). MISO, NYISO, and ERCOT all introduced centralized wind power forecasting in 2008, whereas PJM is implementing their forecasting system in 2009.