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Expected Energy Not Served (EENS)
European Union Electricity Market Glossary

 

 

 

'Expected Energy Not Served' (EENS) or 'Expected Energy Unserved' (EEU) represents a metric which could be used to measure security of supply as well as to set a reliability standard.

 

 

Recital 11 of the Proposal for a Regulation of the European Parliament and of the Council on risk-preparedness in the electricity sector and repealing Directive 2005/89/EC, 30.11.2016 COM(2016) 862 final, 2016/0377 (COD)

 

A common approach to crisis prevention and management requires, above all, that Member States use the same methods and definitions to identify risks relating to the security of electricity supply and are in a position effectively to compare how well they and their neighbours perform in that area. The Regulation identifies two indicators to monitor the security of electricity supply in the Union: 'expected energy non served' (EENS), expressed in GWh/year, and 'loss of load expectation' (LOLE), expressed in hours/year. These indicators are part of the European resource adequacy assessment carried out by the European Network of Transmission System Operators for Electricity (ENTSO-E), pursuant to [Article 19 of the proposed Electricity Regulation]. The Electricity Coordination Group shall carry out regular monitoring of the security of supply based on the results of these indicators. The Agency for the Cooperation of Energy Regulators (Agency) should also use these indicators, when reporting on Member States' performance in the area of security of supply in its annual electricity market monitoring reports, pursuant to [Article 16 of the proposed ACER Regulation].

 

This is the amount of electricity demand - measured in MWh – that is expected not to be met by generation in a given year.

 

This combines both the likelihood and the potential size of any shortfall.

 

Just as in the case of LOLE, the EENS should not be taken to mean there will be that particular amount of blackouts, because in the vast majority of cases, this would be managed without significant impacts on consumers (DECC Reliability Standard Methodology, July 2013).

 

The so-called 'Winter Energy Package' applies EENS as the key metric for European resource adequacy assessments.

 

The said estimations cover the overall adequacy of the electricity system to supply current and projected demands for electricity for a ten-year period from the date of that assessment (in a yearly resolution), and, according to Article 19(4)(h) and Article 19(5)(c) of the Proposal for a Regulation of the European Parliament and of the Council on the internal market for electricity (recast), 30.11.2016, COM(2016) 861 final 2016/0379 (COD)must use EENS (and LOLE) as reliability standard indicators.

 

 

 

 

 

IMG 0744

    Documentation    

 

 

 

 

Proposal for a Regulation of the European Parliament and of the Council on the internal market for electricity (recast), 30.11.2016, COM(2016) 861 final 2016/0379 (COD), Article 19(4)(h) and Article 19(5)(c)

  

Proposal for a Regulation of the European Parliament and of the Council on risk-preparedness in the electricity sector and repealing Directive 2005/89/EC, 30.11.2016 COM(2016) 862 final, 2016/0377 (COD), Recital 11

 

DECC Reliability Standard Methodology, July 2013

 

 

 

 

 

 

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Last Updated on Friday, 22 February 2019 10:01
 

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