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Frequently Asked Questions

What is a Weather Normalization Adjustment (WNA)?
A WNA is a factor that helps level out high gas bills due to colder-than-normal weather and low gas bills due to warmer-than-normal weather.

How does the WNA work?
For the 2013-2014 winter heating season normal degree-days will be based on the period from October 1983 through May 2013. No WNA adjustment occurs if these normal weather conditions occur. Weather conditions colder than normal will result in a credit. Weather conditions warmer than normal will result in a surcharge. The WNA factor, based on the individual customer usage and weather conditions during each billing period, will be used to calculate the amount of the WNA credit or surcharge.

Why have a WNA? What are the benefits for customers?
WNA benefits customers in the following ways:
1. Customers will receive a credit on their bills during colder-than-normal weather.
2. WNA provides Virginia Natural Gas revenue stability, enabling us to better plan and schedule system maintenance and improvements contributing to operational quality and pipeline safety.

Is WNA used in other states?
Yes, many state have approved a weather normalization adjustment for natural gas companies.  WNA has a proven track record of working well for both customers and gas companies in many states throughout the country. The use of weather adjustments has grown substantially during the past 20 years and includes many gas companies across the country and in Virginia.

Is the WNA a rate increase?
No. The WNA is designed to be revenue neutral because it reduces bills when the weather is colder-than-normal and surcharges bills when the weather is warmer-than-normal. The calculations used to determine these amounts are based on the method and data approved by the VSCC.

What customers will see a WNA on their bill?
All participating customers served under Rate Schedule 2B or 2C will see a WNA on their bills during the WNA billing period, typically November through April.

When will a customer see a WNA on the bill?
WNA is effective for six billing periods during the heating season beginning with billing cycle 10 in November. Billing cycles 10–21 will have a WNA on their bills November through April and billing cycles 1-9 will have a WNA on their bills December through May.

How is the Weather Normalization Adjustment (WNA) on my bill calculated?
A WNA factor adjusts your delivery charge during the winter months for fluctuations in normal weather. The factor is based on the individual customer's weather sensitive portion of their bill, defined as all usage in excess of each customer’s non-weather sensitive usage or base use.  Base Use is defined as the average daily consumption during designated summer months. CCF (hundred cubic feet) of natural gas used and weather conditions (heating degree-days) during each bill period, is used to calculate the amount of your WNA bill credit or surcharge. The actual heating degree-days in each bill period are compared to the normal heating degree-days for the period to determine if the weather is colder or warmer than normal.

For the 2013-2014 heating season normal degree-days will be based on the period from October 1983 through May 2013. Heating degree-days are calculated by subtracting the average temperature for the day from 65 degrees F. Sixty-five degrees is considered the base temperature at which most homes and buildings would be comfortable. Heating degree-days statistics provided by the National Oceanic and Atmospheric Administration (NOAA), a government agency that tracks weather conditions, are used to calculate the WNA factor. View the heating degree-day information for your bill period. (Your WNA factor is not shown, as each customer’s WNA factor is based on individual account gas usage.)