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Operation of gas storages

Medium-term horizon

By 2030 it is not anticipated, there will be new gas storage capacities put into operation; however, an increase of storage capacities will happen despite that. UGS Dolní Bojanovice be counted as new facility connected to ga system (643 mcm) and there will be increase of capacity at UGS Dambořice (from 298 up to 448 mcm) from 2021; and at Uhřice. Capacity of UGS Uhřice will be increased gradually by 5 mcm per year, from actual 330 mcm up to 345 mcm in 2023. During the shot-term horizon, a ration between gas consumption and gas storage capacities will be kept comfortably in all case studies, i.e. between 35-40%. This is because of increase of capacities (mentioned above), but by effect of mild increase of demand for natural gas in this period.

Long-term horizon

Around 2035 in all case studies, a significant growth of demand for gas takes place. This is caused by realization of new gas-combustion blocks for electricity production and for CHP. If the ratio of gas storage capacities and annual gas consumption want to be kept, there is designed such a development of storage capacities after 2030 – so the ratio does not fall below the limit of 35%. In case of Conceptual case study, in which the biggest increase of demand for gas takes place (223.2 TWh in 2060), new storage capacities are designed up to 3.3 bcm (surplus over new capacities at UGS Dambořice a Uhřice, and connection of UGS Dolní Bojanovice). For resting case studies i.e. New Technologies and Conservative (demand is around 165 TWh in 2060), an identical development around 1 bcm is anticipated there too. Despite that, the number of total storage capacity of all UGSs does not say if the gas system is able to deal with unfavourable operation states. Sufficient withrawal capacities and capacity of pipeline infrastructure are also important. In 2060, the transmission system will be able to be operated within 66-68 days (while there will be decrease in imports by 75%) and in dependence of concrete case study. Moreover, if there will be subnormal outside temperature (calculation was made for -12 °C), the transmission system will be able to remain in operation only 47 days in the Conceptual study, 41 days in the New Technologies case study and 40 days in the Conservative case study.

Table 16.1 Ratio of installed capacity of gas storages to annual consumption (%)



Figure 16.1 Operation without restricted consumption during gas imports reduced by 75%



Figure 16.2 Ratio of UGSs capacities and total consumption – with new UGSs