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About EWIS

The development of wind power is crucial to meeting the European Union’s aspirations and targets for developing renewable energy. To facilitate this development, Europe’s electricity transmission system operators have an important role which they are keen to perform as effectively as possible. As well as ensuring best practice in the technical activities associated with connecting wind generators and delivering their electricity efficiently to consumers, TSOs also want to contribute to the development of European electricity arrangements so that wind power can be economically integrated to the benefit of all.

The European Wind Integration Study (EWIS) is an initiative established by the trade associations of the European transmission system operators in collaboration with the European Commission. It aims to work with all the relevant stakeholders especially representatives of wind generation developers. The study will use results from detailed network and market models of the European transmission system (including all 4 synchronous areas of mainland Europe, the Nordic countries, Great Britain and Ireland) for scenarios representing immediate and longer-term needs. The recommendations will be aimed at developing, where possible and appropriate, common European solutions to wind integration challenges. Given the particular statistical characteristics of wind generation, the study will be seeking arrangements that will make best use of the pan European transmission network to deliver the benefits of wind generation across Europe.

The scope of work covers all the technical, operational, market and regulatory aspects related to the integration of wind power in Europe at a large scale.

The project is directed by a project steering committee with primary study resources provided by the following transmission system operators:

Lead transmission system operators Country
Elia System Operator Belgium
Transpower Stromübertragungs GmbH (Project_Management) Germany
50Hertz Transmission GmbH Germany
Amprion GmbH Germany
CEPS, a.s. Czech Republic
EirGrid plc Ireland
Energinet.dk Denmark
Hellenic Transmission System Operator Greece
National Grid Electricity Transmission United Kingdom
PSE-Operator Poland
Red Eléctrica de España Spain
Rede Eléctrica Nacionalis Portugal
RTE EDF TRANSPORT SA France
TenneT TSO B.V. Netherlands
Verbund – Austrian Power Grid AG Austria


The project is organised into six working groups.

WG 1 Present Situation and Market Aspects
This working group is responsible for obtaining information concerning the networks, their users, and the current issues arising. Analysis and collation of this data provides the basic information for the quantitative assessments undertaken in the EWIS project.

WG 2 Scenarios and Exchange Schedules
To undertake detailed technical and economic analyses it is necessary to focus on specific conditions and snapshots. This working group is responsible for ensuring the chosen scenarios are representative, realistic and self-consistent.

WG 3 Power System Analysis
To assess the various important aspects of the performance of the electricity transmission network, a suite of computer models and analysis techniques is required. The EWIS project will not only examine which transmission lines will be loaded or overloaded but will also look into various quality of supply aspects and the resilience of the network for faults and emergency conditions.

WG 4 Operational Aspects
As electricity cannot be easily stored, it is necessary to balance production and consumption in power systems second by second, while ensuring that power transfers between areas remain within the capability of network equipment. The challenge of this group is ensuring that current automatic and manual operational systems that carry out these functions have an adequate performance in the future with large injections from wind generation.

WG 5 Cost Analysis
Whereas the chief cost associated with producing electricity from the wind is the cost of constructing, some additional connection and operational costs (associated with system balancing and maintaining security of supply) must also be considered. This working group will examine these network related costs.

WG 6 Communications and Legal Aspects
Success of the EWIS project will depend on effective interactions with stakeholders. These conversations, and the formulation of findings and recommendations, will need to recognise the differing legal requirements concerning networks, electricity and renewable energy sources in different countries and market places. For this reason, these aspects are brought together in this working group.

Co-ordination
The EWIS project is managed on a day to day basis by a project management team comprising the working group leaders. The strategic direction of the project is provided by a project steering committee which is in turn advised by a project consultation board.