The Strategic Petroleum Reserve (SPR) is a supply of petroleum held by the United States Department of Energy (DOE) for emergency fuel. It is the largest emergency supply in the world, and its underground tanks in Louisiana and Texas have capacity for 797 million barrels (126,700,000 m3).[1] The United States started the petroleum reserve in 1975 after oil supplies were interrupted during the 1973–1974 oil embargo, to mitigate future supply disruptions.