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)
2026-06-12	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
2026-04-17	309	404	202	269	879	326	424	127	184	864
2026-04-10	283	371	200	267	839	312	409	124	179	838
2026-04-03	277	358	208	261	807	308	400	123	174	817
2026-03-27	270	350	208	258	775	312	404	122	171	800
2026-03-20	271	351	204	257	745	323	415	122	167	787
2026-03-13	302	374	201	258	747	338	431	124	167	777
2026-03-06	294	375	200	259	721	358	447	125	170	764
2026-02-27	322	397	198	257	712	388	474	129	176	762
2026-02-20	364	441	201	259	753	423	510	134	182	776
2026-02-13	388	457	207	271	747	467	560	143	192	832
2026-02-06	438	510	209	273	784	506	611	152	202	873
2026-01-30	502	584	213	272	891	551	661	160	209	910

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