Hybridparks combines two or more energy sources. In this thesis in partnership with Arise AB case studies have been conducted in combined photovoltaic power in their existing windparks. Wind and photovoltaic have productionpatterns that compelemts the other. Which in turn gives a more stable production.  Four windparks was chosen to be studied and tested as hybridparks: Fröslida, Häradsbo, Råbelöv och Idhult.  The size of the hybridpark was based on an earlier study from Arise. One conclusion from that study was that it is possible to install photovoltaics with 2/3 of the installed windpower.  The photovoltaic plant was simulated in the program Polysun. Polysun can make simulations and give insight on the possible photovoltaic yield. The data from the simulation was combined with the windpower yield data from Arise to analyse how the hybridpark would function.  Energy storage with lithium batteries have been calculated and tested in Excel. The results show the impact the energy storage have on production and delivery to the grid. A simple control scheme with on/off method with a schedule gave the best results in a daily battery cycle.  The energy sources seldom overlap and with a controlled energy storage it is possible to deliver power to the grid during power lacking periods such as winter.