Working gas in storage in the contiguous United States was 1,155 billion cubic feet (about 32.71 billion cubic meters) in the week ending April 5, a net increase of 25 billion cubic feet from the previous week, the U.S. Energy Information Administration (EIA) said in a report on Thursday.

At 1,155 billion cubic feet, total working gas storage decreased by 13.7 percent from this time last year, or 29.6 percent below the five-year average, but still within the five-year historical range, according to EIA's Weekly Natural Gas Storage Report.

The storage of working gas usually turns to increase in late April and will continue to grow into early November when heating season starts in the country, according to previous data.

Working gas is defined as the amount of natural gas stored underground that can be withdrawn for use.

Working gas storage capacity can be measured in two ways: design capacity and demonstrated maximum working gas capacity.

The contiguous United States consists of the 48 adjoining states of the United States, plus the District of Columbia, and excludes the non-contiguous states of Alaska and Hawaii, and all off-shore insular areas.