Humbly Grove Energy owns and operates the Humbly Grove Oil Field, licence block PL116 near Alton, Hampshire. Natural gas and Oil has been produced from its facilities since the discovery in the early 80s. Since then the field has produced in excess of 6 million barrels of oil and is forecasted to produce an additional 1 million barrels following the introduction of Gas storage. Gas Storage Underground Gas Storage facilities have been worldwide for over 90 years and there are more than 600 facilities of various types in operation. At Humbly Grove, Gas Storage is based on the principle of injecting gas from the National Transmission System into an underground reservoir – in our case the space in porous rock formations left after the original oil and gas have been produced – and storing it for later use. Generally the reservoir is filled during the summer months when gas demand is low and produced back into the grid in winter when demand and prices are higher.