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How a weather normalization adjustment can affect your natural gas bill.
Normal weather for the SCE&G service territory is determined by the official 30-year average published by the National Oceanic and Atmospheric Administration, or NOAA, based on 30-year average temperatures for our service area.
When weather is colder than normal, WNA adjusts the rate per therm downward and when the weather is warmer than normal, WNA adjust the rate per therm upward. Heating Degree Days (HDDs) are a measure of how cold it is on a given day.
SCE&G uses a system-wide value of HDDs based on multiple weather stations. HDDs are determined by comparing the mean (the average of the high and low) outdoor temperature to a base temperature of 65°F (threshold at which heat would typically be necessary), by weather station. The HDD values are then averaged. The colder the average temperature, the higher number of HDDs and generally, the higher amount of natural gas needed to heat your home. Actual HDDs are calculated and compared to normal HDDs produced by NOAA to determine if the weather was colder or warmer than normal.
Here is an example of how it works – let’s say the high low temperatures for a particular day are as follows: