This report analyses the system benefits of coupling renewables with clean flexibility, with a focus on the opportunity for pairing solar electricity generation and battery storage in the EU. . The EU has long recognised batteries as one of its strategic technological sectors. To make its battery supply chains secure, resilient and sustainable, the EU uses three approaches. In this paper, an accurate review of the state-of-the-art of. . Yet, batteries are at the core of the European Union's energy transition, forming a crucial link in achieving the ambitious goals of the European Green Deal. Drivers for battery. . Coupling renewables and clean flexibility growth, the EU can benefit from abundant home-grown wind and solar, reduce dependence on imported fossil energy, and avoid costs. In 2030, the EU could avoid gas costs worth €9bn by capturing excess wind and solar.