Yela. Underground natural gas storage facility

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1 Yela Underground natural gas storage facility The Yela project being developed by Enagás in the province of Guadalajara will be the third underground natural gas storage facility in Spain. A key piece of infrastructure in the Spanish Gas System due to its strategic location in the centre of the Iberian peninsula.

2 More than 90 years of underground storage facilities The natural gas chain are in deep saline aquifers, including one under Berlin s city centre. The first dates Natural gas s long journey from the gas fields to the end consumer Extraction The gas is extracted from the gas fields using drilling wells and extraction pipes NG transport The natural gas (NG) is transported through gas pipelines Guadalajara Yela Liquefaction The NG is liquefied (LNG) to reduce its volume and make it easier to transport LNG transportation The liquid natural gas is transported in methane tankers to regasification plants Regasification The liquid gas is returned to its original gaseous state in regasification plants Guadalajara Gaviota Serrablo Yela Castor NG transport Natural gas is transported through the high-pressure network Distribution to end consumers Palancares Poseidón main storage facilities in Europe storage facilities in operation storage facilities under development The Yela storage facility is located in the municipal area of Brihuega the surface of the Earth, made of Upper Cretaceous fractured dolomites. The porosity and permeability of the aquifer, contained within seal rock, allow gas to be stored inside. A system that copies nature Underground storage Gas has been stored naturally for millions of years. The process will be replicated at Yela where a natural formation will be used as an underground storage facility. The facility has been designed and developed to the highest standards of safety and environmental protection and will play a key role in the Gas System: evening out the differences in consumption between summer and winter and retaining a cushion of strategic reserves. In short, it will help to guarantee the supply of natural gas.

3 Increasing storage capacity is a key factor to guaranteeing supply Spain imports practically all the gas it consumes, and its storage capacity neighbouring European states. New storage facilities are required for the future. Enagás is constantly investigating all possibilities for underground natural gas storage in Spain. Enagás, leader in natural gas storage The Yela storage facility is a project developed by Enagás, leader in natural gas transportation, storage and regasification with more than forty years experience in constructing gas infrastructure in Spain. Enagás also owns two other underground storage facilities: Serrablo, located in Huesca and in operation since 1991, and Gaviota, located off the coast of Vizcaya, that started operating The company also has almost pipelines throughout the country, three regasification plants in Barcelona, Cartagena and Huelva and Gas (BBG) plant in Bilbao.

4 Yela underground storage facility Workings of a storage facility 5IF OBUVSBM HBT JT TUPSFE JO BU B EFQUI PG NFUSFT in a saline aquifer or exhausted gas or oil fields. The injected gas displaces the water and fills the pores in the storage rock, which is sealed by a later of impermeable rock above. Well heads Compressor room Water tank for fire-fighting.fbtvsfnfou MBCPSBUPSJFT Office building Gas-drying units Process water tank Plant on surface Plant on surface Limestone The surface installations of the storage facility are on a raised plain Seal rock Safety valve at N Control well Marls Operating well Injection/ extraction of gas Limestone Natural gas Water Control well Storage Porous storage rock (dolomite) Injection/ Extraction well Water Clays.BSMT Storage facility in a natural saline aquifer made of porous rock Storage Process Injection Clays In summer, compressed gas is injected through the wells. This saline aquifer is a natural deposit. Production In winter, the gas is extracted. Water refills the pores in the aquifer. The gas is treated and injected into the grid. Water Anhydrite Seal rock Dolomite Initial situation Permeable and porous formation saturated with salt water located under the impermeable rock Gas injection Anhydrite Dolomite Storage Gas extraction Key project dates Seismic survey carried out in central Spain Study of the Santa Bárbara structure using seismic and other exploratory surveys Enagás obtains the operating concession and recognition for public use for the Yela storage facility Environmental Impact Statement obtained Government Authorisation obtained and work starts Storage facility starts operating

5 Main features of the Yela storage facility The facility will guarantee supply for the entire Spanish gas system, particularly in the central region and the province of Guadalajara. Therefore, it will be key during peak periods of gas demand. It will make Brihuega a benchmark among energy centres. It will boost the economy of the area by directly and indirectly creating employment and wealth. It will help build a sustainable model, as its composition and efficiency makes natural gas the least contaminating fossil fuel. Storage facility technical data

6 Printed on recycled paper and chlorine-free Enagás, S.A