# Glossary

• Load: the electrical energy that is consumed by a component, circuit, device, piece of equipment, or system that is connected to a source of electric power, in order to perform its functions. It is also called “electric load.”

• Load Profile:  a graph of the variation in the electrical load versus time.

• Load Factor:  the ratio of the average load over a designated period of time to the peak load occurring in that period.

• Load Duration Curve:  a load duration curve illustrates the variation of a certain load in a downward form such that the greatest load is plotted in the left and the smallest one in the right. It illustrates the relationship between capacity requirements and capacity utilization.

• Demand:  measured in kilowatts (KW) is the rate at which electricity is used at any one given time. For more information download our Demand fact sheet.

• kWh:  a unit of energy, equivalent to the energy transferred or expended in one hour by one kilowatt of power. The term kilowatt-hour (kwh) refers to the quantity of energy used.

• Green Button:  Green Button is an industry-led effort to provide electricity customers with easy access to their energy usage data in a consumer-friendly and computer-friendly format. The Green Button in the trending report will export an XML file that can be used to send data to a third party. The Excel link will allow you to download your electricity usage or demand data into a spreadsheet.

• Heating and Cooling Degree Days:  a way to relate each day's temperatures to the demand for fuel to heat buildings.
• To calculate the heating degree days for a particular day, find the day's average temperature by adding the day's high and low temperatures and piding by two. If the number is above 65, there are no heating degree days that day. If the number is less than 65, subtract it from 65 to find the number of heating degree days.
• For example, if the day's high temperature is 60 and the low is 40, the average temperature is 50 degrees. 65 minus 50 is 15 heating degree days. Cooling degree days are also based on the day's average minus 65. They relate the day's temperature to the energy demands of air conditioning. For example, if the day's high is 90 and the day's low is 70, the day's average is 80. 80 minus 65 is 15 cooling degree days.

• Trend Interval:  choose the level of interval in which you would like to create the Trending Report. You may choose to view intervals in hours, days or metered.   Metered refers to the length of the interval that is recorded by your meter.  Demand meters record readings in 15-minute increments.  kWh  meters record meter readings every hour. If you choose “metered”, it will present data in the small increment that your meter records.

• Time Stamp:  each time your meter records a meter reading, it records the time stamp for the meter reading.