PJM will be performing a markets system switchover on Thursday, September 21, starting at 4:15 p.m. (1615 hours.) During this time, there will be an approximately 30-minute delay in information being posted on the following pages and tools: Operational Data page, Markets & Operations page, Interregional map, LMP map, real-time LMP information on the pjm.com home page, PJM Now and Data Snapshot.