Switzerland's most important source of (NEW) energy is hydropower

Renewable.

Explanation:

Renewable energy is also known as clean energy and it can be defined as a type of energy that are generated through natural sources or technology-based processes that are replenished constantly. Some examples of these natural sources are water (hydropower), wind (wind energy), sun (solar power), geothermal, biomass, waves etc.

Basically, a renewable energy source is sustainable and as such can not be exhausted.

In Switzerland, about 60% of its energy generation comes from hydropower (hydroelectricity) and comprises of over 550 hydropower stations.

Hence, Switzerland's most important source of renewable energy is hydropower.

a conclusion based on evidence is an example of a. inference