The Castor Project is a submarine natural gas storage facility in the east coast of Spain, in the municipality of Vinarós, able to contain 1,3 Billion cubic meters of gas: 3 months consumption of the Spanish region of Valencia.

It takes the gas from the national gas grid for storage, and when the gas system requires it, these facilities will be able to return the gas to the national grid in the same conditions as it was received through a submarine gas pipeline.