Europe has added 126 GW of new renewable energy capacity since last summer, driven mainly by solar photovoltaic (PV) installations, according to the latest Summer Outlook report published by the European Network of Transmission System Operators for Electricity (ENTSO-E).
The report, which assesses Europe’s electricity system adequacy for summer 2026, concludes that no systemic adequacy risks are expected across most of the continent, despite ongoing geopolitical uncertainty and rapid changes in the power mix.
ENTSO-E said the surge in renewable deployment — particularly solar PV — reflects the continued transformation of Europe’s electricity system. The growth in clean generation has also intensified periods of excess supply during times of high renewable output and low electricity demand, requiring transmission system operators (TSOs) to rely increasingly on exports and flexibility measures to maintain system balance.
Battery storage capacity across Europe has also expanded significantly, doubling to 29 GW since the previous summer. According to ENTSO-E, the rapid growth of storage, combined with increased interconnection capacity, demand-side response, and operational coordination, is becoming critical as high-carbon generation continues to decline.
“Renewable production keeps expanding,” the report states, adding that flexibility solutions are becoming “more essential than ever” to support system reliability.
While the overall European electricity system is expected to remain secure this summer, ENTSO-E identified localised adequacy risks in Ireland, Malta and Cyprus. These concerns are linked to planned outages at generation facilities, limited import capacity and reduced availability of backup resources.
Moldova was also flagged as facing adequacy risks during summer 2026. ENTSO-E said the country remains vulnerable due to constraints in natural gas supply affecting thermal power generation, combined with weak interconnections, dependence on imports, and exposure to disruptions in the Ukrainian electricity system and transmission routes through the Transnistria region.
The report also addressed the impact of growing geopolitical tensions in the Middle East, including the closure of the Strait of Hormuz, which has increased uncertainty in global energy markets and supply chains. However, ENTSO-E said no major electricity adequacy concerns are currently expected in Europe as a direct consequence of the disruption during the summer period.
The organisation warned, nevertheless, that closer monitoring and additional preparations may be required ahead of winter 2026.
ENTSO-E said its Summer Outlook demonstrates the importance of pan-European adequacy assessments in complementing national and regional analyses. Transmission system operators across Europe are continuing to monitor identified risks and coordinate operational measures to ensure system stability throughout the summer.
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