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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 in the electricity market.

 

 

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 the 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.

 

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) of 30 November 2016 (COM(2016) 861 final 2016/0379 (COD)), required the use of EENS (and LOLE) as reliability standard indicators (the rule implemented in Article 25(3) of the final Regulation (EU) 2019/943 of the European Parliament and of the Council of 5 June 2019 on the internal market for electricity (recast)).


According to Article 23(5)(j) of the said Regulation (EU) 2019/943, the European resource adequacy assessment (carried out by the ENTSO for Electricity on an annual basis) is to be based on a transparent methodology, which must include, among other indicators, also the EENS.

 

 

 

Regulation (EU) 2019/943 of the European Parliament and of the Council of 5 June 2019 on the internal market for electricity (recast)

 

Article 25

Reliability standard

 

1.When applying capacity mechanisms Member States shall have a reliability standard in place. A reliability standard shall indicate the necessary level of security of supply of the Member State in a transparent manner. In the case of cross-border bidding zones, such reliability standards shall be established jointly by the relevant authorities.

 

2.The reliability standard shall be set by the Member State or by a competent authority designated by the Member State, following a proposal by the regulatory authority. The reliability standard shall be based on the methodology set out in Article 23(6).

 

3.The reliability standard shall be calculated using at least the value of lost load and the cost of new entry over a given timeframe and shall be expressed as ‘expected energy not served’ and ‘loss of load expectation’.

 

4.When applying capacity mechanisms, the parameters determining the amount of capacity procured in the capacity mechanism shall be approved by the Member State or by a competent authority designated by the Member State, on the basis of a proposal of the regulatory authority.

 

 

 

 

 

 

 

IMG 0744

    Documentation    

 

 


 

Regulation (EU) 2019/943 of the European Parliament and of the Council of 5 June 2019 on the internal market for electricity (recast), Article 23(5)(j), Article 25(3)

 

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, 25 October 2019 09:54
 

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