EU-Flex

Europe – October 31, 2026 -- The EU Agency for the Cooperation of Energy Regulators (ACER) will open a public consultation on 5 November 2026 on the preliminary version of EU-Flex, an open-source electricity market model built to assess flexibility needs across the EU. The consultation will run until 17 December 2026.

ACER must estimate EU flexibility needs under the 2024 market design reform

The 2024 Electricity Market Design reform tasks ACER with estimating flexibility needs across the EU and identifying potential gaps. Flexibility is the power system's ability to respond to changes in supply and demand. ACER plans to publish its first assessment in July 2027, with EU-Flex supporting the process.

Preliminary release includes source code, test case data and methodology

The preliminary release will contain three components: