How underground storage facilities work to guarantee supply security in Italy.
Natural gas storage is a strategic activity for Italy's energy security. Gas is injected into underground depleted reservoirs during summer months (when demand is low) and withdrawn during winter (when heating demand peaks).
The storage cycle
Italy's capacity
The Italian system
Italy has a storage capacity of about 18 billion Smc, among the largest in Europe. The main operators are Stogit (Snam group) and Edison Stoccaggio. Storage sites are concentrated in the Po Valley, at the location of former depleted gas fields.
Three types of storage
- Strategic storage — mandatory reserve for national emergencies, managed under Ministry directives
- Modulation storage — covers seasonal demand variability
- Balancing storage — compensates daily imbalances between injections and withdrawals
Impact on prices
Storage fill level is a key market indicator. Full storage at the start of winter tends to stabilize prices; low levels generate tension and increases. After the 2022 crisis, the EU introduced a mandatory 90% fill requirement by November 1st of each year, to prevent scarcity scenarios.
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