The Słupia, the Radunia, and the Wierzyca are rivers whose location and energy of water flow was taken advantage of to build hydroelectric power plants. Many of them are still operating and can be visited. The oldest such power plant in Europe, Struga, or the Radunia’s highest-situated plant in Bielkowo, are only a few of the facilities well worth seeing. The principles of physics, chemistry, and mathematics are contained in machines and post-industrial sites, and presented at thematic exhibitions, such as in the Hewelianum Centre.

The Owidz hydroelectric power plant

The Owidz hydro plant is one of the Wierzyca's hydrotechnical facilities continuously operating since the early 20th Century.

The layout of the structure is modelled on the mill buildings, as the Wiechert family, who founded the power stations in the early 20th Century, purchased the watermills on the middle course of the Wierzyca and replaced their old mechanical devices with electrical ones. The hydro plant went through partial modernisations in the 1970's and 1990's