Storage provides real-time flexibility, enabling participation in balancing markets and maintaining grid stability and inertia, especially in Portugal where these markets are growing. Despite the increase in interconnection capacity between Spain and Portugal, it could experience congestions during non-solar hours.
The pursuit of economic viability by storage facility owners will inherently lead to charging during low-cost hours and discharging during hours that are more economically attractive. Storage can replace thermal generation in constraint markets, easing the grid and supporting Portugal's 2040 phase-out target.
Additional hybrid capacity is being deployed, namely by Iberdrola, Greenvolt, Akuo, EDP and GALP, supported by Portugal's Recovery and Resilience Plan (PRR) programme under the “Flexibility and Storage” incentive call. Under this PRR scheme, 41 projects were approved, totalling around 500 MW of new storage capacity and € 99.75 million in grants.
On the standalone side, the Casal da Cortiça facility in Leiria, developed by Infraventus Energy Storage is Portugal's first fully merchant large-scale battery using lithium technology with a power output of 12 MVA and a charging capacity of 24 MWh. Commissioned in June 2025, it trades energy on the spot and ancillary system services.
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Storage can increase self-consumption during non-solar hours, aligned with Portugal''s 2030 goals (5,7GW). The seasonality of consumption in certain locations in Portugal, such as
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