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Welcome To Washington Gas

For more than 165 years Washington Gas has been distributing natural gas to customers in the District of Columbia, Maryland and Virginia. We bring natural gas to your home or business safely and reliably.

Virginia Weather Normalization Adjustment (WNA)

The Weather Normalization Adjustment (WNA) was filed by Washington Gas in their 2007 rate case, which was subsequently approved by the Virginia State Corporate Commission (SCC).

What is the WNA?
The WNA is designed to reduce the volatility of customers' natural gas bills due to weather variances. Through the use of a credit or a surcharge, it is a method of adjusting customers' annual bills to reflect normal, rather than actual, weather conditions during the prior winter heating season (November to May).

How does the WNA work?
The WNA factor is based on individual customer usage and weather conditions during the prior heating season, as well as historical data to calculate "normal" temperatures. Weather conditions that are colder than normal will result in a WNA that is a credit on the bill, as was the case in 2009, 2010 and 2011. Warmer than normal weather conditions will result in a surcharge on the bill, as was the case in 20008 and 2012. Over time, these credits and surcharges should balance out. Here are scenarios showing how variances from normal weather affect Washington Gas and what role WNA plays:

Weather is Colder Than Normal
When the weather during the winter months is colder than normal, the natural effect is an increase in customer's gas usage and higher customer bills. Because of the WNA, Washington Gas is able to distribute to its customers any excess revenue brought by the unusually cold weather. Customers benefit from this by receiving WNA credits from the company.

Weather is Warmer Than Normal
When the weather during the winter months is warmer than normal, customer's gas usage and bills tend to be lower - this means a shortfall in the company's revenue. With WNA, Washington Gas is allowed to recover the revenue loss by placing a surcharge on the customer's bill in a form of a WNA charge.

When the weather during the winter season is normal, the WNA will not be applied.

Is the WNA something new that Washington Gas has added to my bill?
No. The Virginia SCC approved the Washington Gas WNA in September 2007. Washington Gas has applied the WNA to customer bills each summer since 2008. Each year, the Virginia SCC must approve the WNA calculations that Washington Gas files with the Commission.

How is the WNA calculated?
The WNA credit or charge that appears on your bill is not based on your usage during the specific billing month, but rather on normal usage on the account and actual weather conditions from the prior heating season. In years when a credit is due, the credits will appear in total on customers' August bills. In years when a surcharge is needed, Washington Gas may split the charge over three months - beginning in August - in order to reduce the impact.

How does the WNA help?
The WNA provides customers with relief during extremely cold years and Washington Gas with the revenue it needs to recoup fixed costs associated with meter reading, maintenance, postage and safety during extremely warm years.

What is the "Prior WNA Correction"?

The WNA Correction reflects a correction of a previous WNA billing error. The adjustment amount relates to a recent billing system program correction for calculating the annual (WNA) that is applied to all Virginia customer accounts during the summer.

Since identifying this problem, Washington Gas has taken the following steps:

  • Corrected the programmed errors within our customer information systems.
  • Reviewed and recalculated, if necessary, the WNA for each active customer for the past three WNA periods (October 2009 to May 2010; October 2010 to May 2011; and October 2011 to May 2012).

If you were an active customer and are due a credit for the October 2009 to May 2010 and October 2010 to May 2011 WNA periods, that credit will be included in the amount shown on your bill as "PRIOR WNA CORRECTION." Customers in the Shenandoah service area were not affected by the billing errors during these periods.

For the October 2011 to May 2012 WNA period, the corrections result in both charges and credits to customer accounts in both the Northern Virginia and Shenandoah service areas. These credits and charges are also included in the line item entitled "PRIOR WNA CORRECTION" for impacted customers. The amount shown on the "PRIOR WNA CORRECTION" line is the net amount of the adjustments for each period in which you were an active customer.