Adequacy assessment is a fundamental method to measure whether the generation of electricity in a system meets the expected requirements and energy demand at a certain point of time. Historically the moment with the highest load was chosen for this kind of analysis, taking into account generation maintenance and outages and renewable energy reliability. Therefore, under consideration of uncertainties of data acquisition the probable most critical situation could be assessed.
Due to developments in the energy generation mix â€“ more fluctuating renewables and less conventional fossil generation â€“ the need of a more sophisticated assessment is necessary. With increase of renewables in the system the most critical situations may occur in future at times other than peak demand, for instance when the load is low and the in-feed of renewables is high. In addition to the assessment of whether the generation meets the demand, downward regulation and the need for more flexibility in the system share the centre of attention.
The integration of large amounts of renewable energy sources, the internal electricity market, new storage technologies, demand-side response and evolving policies all require revised system adequacy assessment methodologies. ENTSOE is committed to developing its existing European adequacy methodology with a special emphasis on harmonized inputs, system flexibility and interconnection assessments. Because of increasing levels of interconnection in Europe, pan-European and regional short/medium term adequacy assessments are required to complement the national adequacy assessments.