Working gas in storage was 2,744 Bcf as of Friday, May 18, 2012, according to EIA estimates. This represents a net increase of 77 Bcf from the previous week. Stocks were 750 Bcf higher than last year at this time and 753 Bcf above the 5-year average of 1,991 Bcf. In the East Region, stocks were 381 Bcf above the 5-year average following net injections of 45 Bcf. Stocks in the Producing Region were 274 Bcf above the 5-year average of 790 Bcf after a net injection of 19 Bcf. Stocks in the West Region were 98 Bcf above the 5-year average after a net addition of 13 Bcf. At 2,744 Bcf, total working gas is above the 5-year historical range.

Working gas stocks in the Producing Region, for the week ending May 18, 2012, totaled 1,064 Bcf, with 257 Bcf in salt cavern facilities and 807 Bcf in nonsalt cavern facilities. Since May 11, working gas stocks increased 19 Bcf in the salt cavern facilities and remained at the previous week's level in the nonsalt cavern facilities. An historical series of the salt and nonsalt subtotals of the Producing Region is available for download at: wngsr_producing_region_salt.xls.

http://ir.eia.gov/ngs/ngs.html