I am intrigued to know if any document/reference exists that mentions the typical duration of congestion on electrical grids, be it transmission or distribution lines.
I know that peak demands last between 15-30 minutes (hence referred to as 'peak'). But i have heard that periods of congestion on electrical networks, particularly during peak heating or cooling season could also last as long as 4 hours.
Please could anyone refer me to any document/study?