In the society man uses energy intensively, human being is completely dependent of energy resources he/she utilizes. Nowadays the society of consumption and production leads to a daily abundant use of available resources on earth. It turns into many forms, such as light, heat, electrical, mechanical, chemical and nuclear. At the end of 20th century, it was almost unanimously agreed, abundant use of these resources have a negative impact on the planet, like the global warming or the greenhouse effect. The reserves of fossil fuels started to show signs of extinction. Due to indicated reasons, the development of many renewable energies have been started. Anyway, a question what energy composition or "mix" is the best, remains open. We raise hypothesis, that energy mix used by a country, depends on availability of particular resources and their prices. Hence, the paper is devoted to analysis of energy resources structure and their prices in four developed countries: France, Japan, USA and Germany. Insights about validity of raised hypothesis are being formulated.