When the mean temperature is less than 65 degrees Fahrenheit the heating degree days are equal to the total number of hours that temperature is less than 65 degrees Fahrenheit for an entire year. A difference in temperature. Often used in the context of the difference between the design indoor temperature and the outdoor temperature. The rate at which energy is delivered to loads and scheduling points by generation, transmission or distribution facilities. The level at which electricity or natural gas is delivered to users at a given point in time.
Electric demand is expressed in kilowatts.
Demand Bid A bid into the PX indicating a quantity of energy or an ancillary service that an eligible customer is willing to purchase and, if relevant, the maximum price that the customer is willing to pay. The electric capacity requirement for which a large user pays. It may be based on the customer's peak demand during the contract year, on a previous maximum or on an agreed minimum. Measured in kilowatts. The sum to be paid by a large electricity consumer for its peak usage level.