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There have been many wind integration studies in recent years, with evolving methodologies. Since power systems and data availability vary significantly, the results and methodologies used in these studies have varied accordingly. This paper presents findings from an international collaboration under IEA WIND Task 25 working towards Recommended Practices for Wind Integration studies. An overview of a complete wind integration study is presented as a flow chart. The set-up of a study and the main assumptions have a critical impact on the results. The main steps in the simulations are presented with recommendations on methodologies: increase in reserve requirements, estimating impacts on other generation and balancing, capacity value of wind power and increase in transmission due to wind power. The recommendations are applicable for other variable renewable sources, including photovoltaics.

An international forum for exchange of knowledge of power system impacts of wind power has been formed under the IEA Implementing Agreement on Wind Energy. The task “Design and Operation of Power Systems with Large Amounts of Wind Power” is analysing existing case studies from different power systems.There are a multitude of studies made and ongoing related to cost of wind integration. However, the results are not easy to compare. This paper summarises the results from 15 case studies.