Performance measures and availability of European power plants

Reliable representation of power plant availability is essential for energy system analysis, electricity market modelling and security-of-supply studies, yet openly accessible datasets are scarce and heterogeneous. This data set presents a harmonised set of performance measures for thermal and hydropower units in the ENTSO-E area derived from monthly unavailability reports on the ENTSO-E Transparency Platform. We reconstruct unit-level availability time series from event-based outage records, apply transparent filtering, clustering and interpolation procedures, and enhance the data with technology and commissioning information from merged open power plant databases. From these processed time series we compute hourly measures and a broad range of time-based performance indicators, including availability factors, outage factors and rates, failure and repair rates, and statistics on partial derations, in both capacity-weighted and unweighted form. The resulting indicators are provided by country, season, plant type and technology, and are validated against historical generation records, selected adequacy studies as well as other journal publications. The accompanying open-source Python workflow enables full reproducibility and direct reuse in data processing or modelling. In addition, two example algorithms are included that can be used to simulate outage series for individual generation units or aggregated power plant fleets.