In this context, the EU-funded Air4NRG project aims to improve long-term energy storage. Specifically, it targets over 70 % round-trip efficiency, sustainability, and integration with the grid. Compressed-air energy storage (CAES) is a way to store energy for later use using compressed air. A consortium of Norway's Scatec and Japan's Aeolus, a unit of Toyota Tsusho, will develop a 100 MW PV plant near Mazouna in Sidi Bouzid Governorate, all equiped with Battery Energy Storage System (BESS) What are. To support the ambitious plans for decarbonizing the Tunisian power system, GET. transform teamed up with GIZ's program, Support for an Accelerated Energy Transition in Tunisia (TETA) through a Leveraged Partnership and contracted Energynautics to do an assessment on Battery Energy Storage Systems. solar PV and wind together accounting for nearly 70%. The integration of these variable energy sources into national energy grids will largely depend on storage technologies, and among them especially batteries, to provide the flexibility required to smooth the energy supply w ich expected to reach. Tunisia's energy storage power generation sector is transforming faster than a desert sunset. With solar irradiation levels hitting 5. 3 kWh/m2/day and wind speeds reaching 9 m/s in coastal.