Working Gas Volumes in Underground Storage by Region

page last updated: December 3, 2025

Definitions

Natural gas underground storage is a critical part of the natural gas supply chain. Its main purpose is to balance supply and demand, ensure reliability, and support market stability.

Source: U.S. Department of Energy, Energy Information Administration

Date	East	Midwest	Mountain	Pacific	South Central	East (5-Year Avg)	Midwest (5-Year Avg)	Mountain (5-Year Avg)	Pacific (5-Year Avg)	South Central (5-Year Avg)
2026-09-11	795	934	241	289	1,039	752	899	224	263	1,041
2026-09-04	773	908	239	290	1,044	730	870	220	263	1,024
2026-08-28	753	890	236	285	1,051	710	842	217	263	1,022
2026-08-21	727	866	238	293	1,061	692	818	214	263	1,030
2026-08-14	708	848	237	296	1,080	674	795	212	263	1,040
2026-08-07	693	829	239	300	1,093	660	774	209	264	1,048
2026-07-31	678	809	237	304	1,090	644	756	206	264	1,052
2026-07-24	654	789	238	307	1,096	631	740	203	264	1,063
2026-07-17	631	766	240	314	1,105	616	723	201	264	1,069
2026-07-10	614	749	240	319	1,103	604	705	198	262	1,074
2026-06-26	587	706	230	313	1,086	574	664	189	252	1,069
2026-06-19	558	672	227	312	1,066	585	661	222	280	1,136
2026-06-12	532	638	226	309	1,053	558	634	215	273	1,108
2026-06-05	514	610	222	304	1,037	503	587	171	239	1,035
2026-05-29	480	573	218	298	1,009	473	560	164	232	1,012
2026-05-22	447	539	213	292	993	442	531	157	223	987
2026-05-15	419	505	210	286	972	413	503	150	214	962
2026-05-08	388	476	206	279	941	386	480	143	205	935
2026-05-01	361	452	203	275	914	362	459	137	197	910
2026-04-24	332	429	205	272	905	342	439	131	190	887

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