Heat and Light are generated and distributed according to a precise timetable. Electricity and gas companies carefully plan the production and transmission of energy to meet demand that fluctuates depending on the time of day and needs of residential and commercial customers. Utilities ensure reliable delivery of necessary power and fuel by anticipating usage and adjusting output accordingly.

1. Heat and Light by Timetable Colin Pattinson, Roland Cross, Mark Warner, Jim Fisher Leeds Metropolitan University

2. Heat and Light by Timetable