Syftet med denna studie är att identifiera vilka förutsättningar som kan ligga bakom en investering i solceller i Sverige. Studiens forskningsfråga lyder, Vilka förutsättningar kan påverka energiföretag till att investera i solcellsanläggningar? samt Vilka aspekter kan göra en solcellsanläggning mer lönsam? För att kunna besvara frågeställningarna har ett induktivt angreppssätt i studien använts, som utgör kvalitativa bestämmelser utifrån respondenternas information. I denna studie får läsaren bekanta sig med sex olika solcellsanläggningar belägna i olika delar av landet för att få en inblick i hur solcellsmarknaden fungerar idag. Experter med god uppfattning om solcellsmarknaden har intervjuats för att ge sin syn på marknadsutvecklingen och hur framtiden för solceller ser ut.   Sverige hade under 2015 en installerad solcellseffekt på 47,4 MW vilket motsvarar en ökning med 31 % jämfört med år 2014. Investeringsstöd och låga priser på solcellsmoduler utgör idag de två främsta motiven för aktörer som vill investera i solceller. Företag ser i samband med en solcellsinvestering goda möjligheter att stärka sin miljöprofil, vilket på senare år har visat sig vara en strategi som prioriteras högre än investeringens avkastning. / The purpose of this study is to identify in which conditions that may lie behind an investment in photovoltaics in Sweden. The study’s research questions are What conditions may affect an energy corporation to invest in photovoltaic facilities? and What aspects can make a photovoltaic facility more profitable? An inductive approach has been used in this study in order to answer the research questions, which make qualitative regulations that are taken from the respondents’ information.  The reader will get to know about six different photovoltaic facilities that are placed around different areas in Sweden to get an insight on how the present market for photovoltaics works. Experts with solid competence about the market has been interviewed in order to provide a view on how the future holds for the development on the photovoltaic market. Sweden had during 2015 47,4 MW installed photovoltaic effect which results in an increase by 31 percent compared to 2014. Investment support and low prices on photovoltaic modules are one of the motives for operators to invest in photovoltaics. In a company’s point of view there’s a connection with photovoltaic investments which creates great opportunities to strengthen the brand’s image for sustainable development, which in recent years looks to be a strategy that holds a higher priority than the profit itself.

The thesis is focused on the evaluation of the effectiveness of a residential building. For processing was used itemized budget insulated apartment building created in the program Kros and critique energy performance of buildings. The work evaluates the effectiveness of insulation and return on investment costs.

Searching for savings and lowering costs of economical housing is still very actual topic nowadays. These actions are more affordable with growing energy costs. New development in technology and mass production make using of solar installations more effective and cheaper. By harvesting solar energy we don't have to pollute an environment and we can also stop production of greenhouse gases which cause changing of planetary climate.