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Power system design and asset planning



​​Wind in power system

Wind power is a fuel-free, variable and uncertain form of power generation. While it reduces operational costs of the power system it also causes unique integration challenges. Variability causes difficulties in matching generation and electricity demand and impacts electricity prices. Uncertainty increases the need for operational reserves.

Enabling large penetration of wind power

Cost effective integration can be achieved with a thorough understanding of all potential sources of flexibility that can mitigate variability and uncertainty. VTT has strong expertise in building and using such models.  


VTT offering 

​Value of wind power generationValue_of_wind_power_generation.png

VTT uses and develops power and energy system models that capture the variability, uncertainty and spatiality of wind power generation. We can assess the value of wind power to the power system.

Key features and benefits of power system modelling:

  • Future scenario analyses and investment modelling
  • Policy support, market design
  • Discover hidden values for wind power for developers and policy makers



Electricity market impacts

Wind power has nearly negligible costs to generate power replacing fuel based generation leading to lower electricity market prices. VTT offers profound understanding of the uncertainty and dynamics in play to make the right future investment decisions.​​

Key features and benefits:

  • Energy system planning models
  • Market models for future systems
  • Estimates on long-term power prices
  • Future value of different technologies 


Link to more information about Energy system planning and electricity market simulation​


Capacity adequacycapacity_adequacy.jpg

Wind is a variable power source by nature and the power systems need to cope with the peak demand situations. This can be analysed with proper statistical tools that can evaluate the expected demand as well as the availability of conventional power plants, variable generation, and electricity imports.

Key features and benefits:

  • Expertise on key uncertainties underlying capacity
    adequacy calculations
  • Use of recommended and reliable methods
  • High quality estimates on capacity adequacy



Electricity grid planning

Unifying electricity markets and changing electricity systems pose challenges on optimal design and operation of electricity grids. VTT solves these challenges by solutions ranging from studies on integrating large amounts of offshore wind power with extensive offshore grids, to studies on alternative Smart Grid technologies such as Dynamic Line Rating (DLR).

Key features and benefits:

  • Scenarios contain uncertainties and pose challenges for power system planning
  • Power system planning is a continuous building process, no turning back
  • Optimal solutions through sophisticated expert studies and the future power system technologies with VTT expertise



IEA and EERA activities

VTT coordinates IEA Wind Task 25 Design and operation of power systems with large amounts of wind power. VTT also leads the Energy system modelling sub-programme of the EERA Joint Programme on Energy System Integration.

Key features and benefits


​Value of wind power generation

  • Andrew Keane, Michael Milligan, Chris J Dent, Bernhard Hasche, Claudine D'Annunzio, Ken Dragoon, Hannele Holttinen, Nader Samaan, Lennart Söder, Mark O'Malley, Capacity value of wind power, IEEE Transactions on Power Systems, vol. 26, iss. 2, pp. 564-572, 2011 

Electricity market impacts

  • Kiviluoma J and Meibom P, Influence of wind power, plug-in electric vehicles, and heat storages on power system investments. Energy, Vol. 35, No. 3, pp. 1244–1255, 2010.
  • Holttinen H, Optimal electricity market for wind power, Energy Policy 33 (16), 2052-2063, 2005

Capacity adequacy

  • Kiviluoma J, Meibom P, Tuohy A, Troy N, Milligan M, Lange B, Gibescu M and O’Malley M, Short Term Energy Balancing With Increasing Levels of Wind Energy. IEEE Trans. Sustain. Energy, Vol. 3, No. 4, pp. 769–776, 2012 

Electricity grid planning

  • Helistö, N., Tai, V. OffshoreDC: Electricity market and power flow impact of wind power and DC grids in the Baltic Sea, Research Report : VTT-R-05999-15 VTT, 2015, 65 p. + app. 10 p.
  • Uski, S., Estimation method for dynamic line rating potential and economic benefits International Journal of Electrical Power and Energy Systems. Vol. 65 (2015), 76-82, DOI: 10.1016/j.ijepes.2014.09.034
  • Uski, S., Dynamic line rating forecastability for conservative day-ahead line rating values 41st Annual Conference of the IEEE Industrial Electronics Society, IECON 2015, 9 - 12 November 2015, Yokohama, JapanProceedings. IEEE (2015), 3738-3742 DOI: 10.1109/IECON.2015.7392683
  • Uski, S., Kim, I., Assesment of wind power impact on power system transmission losses, 5th IEEE PES Innovative Smart Grid Technologies Conference Europe, ISGT-Europe, 12 - 15 October 2014, Istanbul, Turkey
    Proceedings. IEEE (2014), 5 p. DOI: 10.1109/ISGTEurope.2014.7028975
  • van Hulle, F., Kreutzkamp, P., Uski-Joutsenvuo, S., Enhancing cross border exchange to facilitate wind power integration at European scale, German Wind Energy Conference, DEWEK. Bremen, 26 - 27 Nov. 2008 (2008)

IEA and EERA activities



  • 2009-2010: Wind power integration technical study, assignment for Estonian TSO Elering.
  • 2010-2011: Power system assessment for wind energy development in Kazakhstan. Assignment for UNDP, United Nations Development Program.
  • 2014: Finnish Energy Market Authority assignment to assess the power plant capacity reserve for Finland for the years 2015-2020
  • 2012: Finnish Energy Market Authority assignment to assess the power plant capacity reserve for Finland for the years 2013-2017
  • 2009: Expert secretary for Feed-in tariff working group of the Finnish Ministry of Employment and the Economy

Research project participation:

  • EU H2020: RealValue - Realising Value from Electricity Markets with Local Smart Electric Thermal Storage Technology 2015-2018
  • Academy of Finland: Improving the value of variable and uncertain power generation in energy systems, 2015-2018
  • TEKES: Flexible Energy Systems, 2015-2016
  • TEKES: Neo-carbon Energy, 2014-2017
  • EU IEE: REserviceS: Economic grid support from variable renewables, 2012-2014
  • EU ITRE: European Renewable Energy Network study for the European Parliament’s Committee on Industry, Research and Energy, 2011-2012
  • TEKES: Smart Grids and Electricity Markets, 2010-2016
  • Nordic Energy Research: OffshoreDC - DC grids for integration of large scale wind power, 2010-2016
  • EU FP7: ToPDAd – Tool-supported policy-development for regional adaptation, 2012-2015
  • EU FP7: Analysing Transition Planning and Systemic Energy Planning, 2010-2012
  • TEKES: Assessment of impacts of wind power on the power system, 2006-2008
  • EU FP7: WILMAR – Wind power integration in a liberalized electricity market, 2002-2005