The Twenty Francs coin is a denomination of the Swiss Franc. Given that Switzerland has four official languages, the Franc has three different names: Franken in German, franc in French and Romansh, and franco in Italian.
In regular circulation, the denomination is served by a banknote. These coins are non-circulating legal tender made for collectors. They are issued in topical series, celebrating various aspects of Swiss heritage or nature.
The edge is inscribed with the motto DOMINUS PROVIDEBIT (The Lord will provide - a quote from the Bible, Genesis 22, 8), and thirteen stars representing the original thirteen cantons of the Swiss Federation.
This commemorative coin is dedicated to Hydropower - "the energy of the future".
Swissmint says about it:
Hydropower is one of the oldest energy sources in the world and was already used more than 5,000 years ago. It offers an efficient, climate- and environmentally-friendly form of generating electricity. In Switzerland, the hydropower plant network consists of run-of-river power plants (usually consisting of a barrage formed of a weir in a flowing body of water, e.g. river power plants), storage power plants (hydropower plants with natural or artificial water storage reservoirs) and pumped storage power plants (consisting of two water basins located at different heights, e.g. Grimsel). A total of 677 plants are in operation throughout the country, producing an average of around 36,741 gigawatt hours of electricity per year and thereby supplying 56% of Switzerland's energy needs. Around 11% of Switzerland's hydropower generation comes from centralised international hydropower plants on border waters.