Answer:
Because of its rivers and topography containing Big rivers with hydroelectric potential
Step-by-step explanation:
Summed up Hydroelectric power is obtained by the water flow moving turbines that generate electric power. This water is obtained from rivers with a high flow generally near mountainous regions, this kind of rivers is all over Europe because of its topography, the Alps and the Ural mountains are home of many hydroelectric plants taking advantage of the rivers flowing down. For example in Austria, the Danube River is used for obtaining Hydroelectric power.
Although the Hydroelectric plants are smaller compared to Asian or Canadian plants, hydroelectric power is still one of the main sources of energy for central Europe, countries like Spain, France, Netherlands, Sweden, Austria take advantage of their mountains and rivers running down them for building the hydroelectric plants.