In the Krka National Park, on the Skradinski Buk waterfall you can find the remains of the first AC hydroelectric power plants in Croatia, and one of the oldest in the world. Jaruga was put into operation on 28 August 1895, just two days after the first, and one of the most famous alternating hydro power plants in the world, the one at Niagara Falls in the United States. An interesting fact is that the hydro power plants at Niagara Falls were designed by the patents of Nikola Tesla and George Westinghouse.Jaruga Hydroelectric Power Plant is listed in the catalog of historically important engineering projects and on July 5, 2013, the memorial on its remains was officially discovered. The International Institute of Electrical and Electronics Engineers - IEEE marks with memorial plaques sites of world importance for the development of Electrical Engineering and Computing.Jaruga 1 below the waterfall Skradinski Buk is turbocharged, with two generators and transformers, and associated transmission line on wooden poles length 11.5 kilometers fed the electricity town of Sibenik. This is how city of Sibenik became one of the first cities in the world to get the public lighting to AC electricity, and Jaruga was one of the first comprehensive multi-phase electricity system in the world.